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11-23-2012, 06:23 PM | #1 |
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chrome dip vs. chrome plating
I have a neighbor who insists chrome dipping is just as good as chrome plating for my bumpers and much cheaper. I've never heard of the process. Any thoughts?
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11-23-2012, 06:34 PM | #2 |
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Re: chrome dip vs. chrome plating
It can't be true. It might look better than rust or aluminum spray paint, but it won't be the same or better than real chrome.
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11-23-2012, 07:10 PM | #3 |
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Re: chrome dip vs. chrome plating
Isn't plating is to dip?
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11-23-2012, 07:20 PM | #4 |
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Re: chrome dip vs. chrome plating
While I am fishing for info can you give me rough estimate of the cost of plating a full set of bumpers?
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11-23-2012, 09:13 PM | #5 |
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Re: chrome dip vs. chrome plating
Yes, to plate an object it has to be 'dipped' in the plating tank. But unless you apply an electric current, no plating will take place. Chrome plating involves an anode, usually lead, a cathode, the part being plated and a solution of chromic acid, sulphuric acid, water and mist suppressants. An electric current is applied, neg - cathode, pos - anode, at approx 2 amps per square inch of plating area, so a big power supply is needed.
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11-24-2012, 08:30 AM | #6 |
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Re: chrome dip vs. chrome plating
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I did a quick search on chrome dipping and did not come up with anything. You would have to find out some more about what he really means. There is a process for depositing nickel on some surfaces that does not require electricity, but this is not chrome plating. Besides chrome plating for the decorative stuff (like bumpers) is really more of a clear coat over nickel. Here are some comments I have on plating that may help: Plating the A parts |
11-24-2012, 09:07 AM | #7 |
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Re: chrome dip vs. chrome plating
dipping is a not like electroplating . ive worked in several shops & dave is correct . anything else must be a hoax ...........
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11-24-2012, 10:53 AM | #8 |
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Re: chrome dip vs. chrome plating
There was a thread a year or two back where this new "plastic" chrome was being promoted. The link to the product even showed Jay Leno watching the process and he appeared to like it. Parts were dipped into a tank of something and came out with a shiney covering. I don't recall if the covering was baked on with heat, but to me it was like taking smooth bumper bars and having silver powdercoat put on them. It's just not the same as real chrome.
Last edited by Tom Wesenberg; 11-24-2012 at 11:23 AM. |
11-24-2012, 10:58 AM | #9 |
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Re: chrome dip vs. chrome plating
A local powder coater offers (chrome powdercoat)does not look like chrome plating? its kinda dull.
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11-24-2012, 11:14 AM | #10 |
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Re: chrome dip vs. chrome plating
There is ignorance here in terminologies. I believe the correct way to look at this is both parties are talking about the dame thing whether you/they realize it or not.
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11-24-2012, 01:17 PM | #11 |
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Re: chrome dip vs. chrome plating
Sounds to me like your neighbor doesn't know anything about which he is speaking.
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11-24-2012, 01:41 PM | #12 |
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Re: chrome dip vs. chrome plating
We've done this...looks crappie too me...."flash Chroming metal"...
* I believe this is what you are talking about * |
11-24-2012, 01:46 PM | #13 |
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Re: chrome dip vs. chrome plating
Normal chroming involves dipping in copper, nickel and then chromium. Flash chrome is where you apply the chrome directly over a smooth substrate, many times stainless steel. It doesn't last as well for sure.
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11-24-2012, 02:13 PM | #14 |
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Re: chrome dip vs. chrome plating
The Jay Leno watch was sprayed on silver nitrate, same as a mirror.
It looks perfect, as good as chrome in appearance, although only a spray and don't know how long it will last in UV. |
11-24-2012, 03:39 PM | #15 |
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Re: chrome dip vs. chrome plating
I've had plenty of dips tell me their chrome work was concours grade stuff. Ya get what you pay for. Been dipped, didn't like it.
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11-24-2012, 04:38 PM | #16 | |
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Re: chrome dip vs. chrome plating
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Among many other things, I designed the chrome roof racks and running board trim solution used on the second and third generation (2001 to present) Cadillac Escalades. In 1998-99 I changed the game by using 434C ferritic stainless substrate, with chrome plating directly over the top. This was a new solution to an ongoing problem of exterior chrome performance in an age of increased acid rain and increaingly alkaline consumer cleansers. To compound that, road commissions across the US have been going crazy with sodium chloride on paved roads in the winter, and magnesium chloride on dirt roads in the summer. This particular chrome chemistry solution completely addressed previous issues with chrome plated steel corrosion, as well as off-color and tea staining issues of polished stainless solutions due to environmental conditions stated above. Cadillac got the high luster and high durability chrome they wanted, and the finish quality has stood the test of time for a dozen years of production. It set the new standard in GM for all chrome finishes on large exterior trim (except for truck front bumpers). |
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11-24-2012, 05:09 PM | #17 |
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Re: chrome dip vs. chrome plating
Hey, nonsense?? BS . . something that has been done recently . . how do we know the results over time? When flash chrome is applied it is done over a substrate like you said, I said similar. The difference is in how well it lasts. We have an adhesion subject here. There is a reason for copper, then nickel, then chromium. Sure that's old technology and I'm not an expert at everything "new". But we shall see how well things done "your" way last over time. From things I have seen on newer cars, they didn't last well. Why is this different?
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11-24-2012, 05:47 PM | #18 | |
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Re: chrome dip vs. chrome plating
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The corrosion resistance comes from the thickness of the nickel underneath the chrome. Copper is rarely used these days, as it has to be plated from a cyanide solution, and EPA regs on pollution control make it very expensive to do. There is a nickel chloride strike which gets used before the bright nickel is applied, replacing the copper cyanide. Why the flash chrome over stainless steel works is because stainless in it self contains chrome and is also highly corrosion resistant. Using a flash of chrome over normal steel will provide no corrosion resistance what so ever. My first trade in the Royal Australian Air Force was as an electroplater, so I do have some inside knowledge on this subject. |
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11-24-2012, 07:15 PM | #19 |
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Re: chrome dip vs. chrome plating
We are way off subject here. Hard chroming on engine parts is totally different IMO. The expectations and how the parts are used are totally different. Chroming on engine parts, been around forever. But it's a different baby.
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11-24-2012, 08:45 PM | #20 |
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Re: chrome dip vs. chrome plating
You mentioned adhesion, I was just pointing out adhesion is not the problem as hard chrome and decorative chrome are essentially the same and there is no adhesion problem when plating chrome, either hard or decorative, directly on to the substrate.
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11-24-2012, 09:47 PM | #21 |
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Re: chrome dip vs. chrome plating
But in a different environment adhesion is different, no? An oiled, albeit hot, engine is different than wet, cold, hot, UV laden outside. Because what I'm seeing is when pieces are chromed without traditional steps, and subjected to outside issues, they don't hold up. No??
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11-24-2012, 09:48 PM | #22 |
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Re: chrome dip vs. chrome plating
Speaking of Jay Leno. Here it is. I am not a true beliver in using this on bumpers or headlight rings, etc. But maybe some dash trim or door panel trim? Or?
But i am still in favor of good old fashion copper, nickel, chrome, if you can find it. California is starting to suck. https://www.youtube.com/watch?v=A-1cTpSZ1l8 |
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11-24-2012, 10:36 PM | #23 |
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Re: chrome dip vs. chrome plating
It will work on a lot of things. It is an expensive process though. The equipment is $$$ I looked into to it several years ago and didn't buy because of the upfront costs.
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11-24-2012, 10:42 PM | #24 |
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Re: chrome dip vs. chrome plating
Thanks ZZ, that's exactly what I thought the guy in the original post was talking about.
Isn't this the same way plastic interior parts have been chromed for many years? |
11-24-2012, 11:28 PM | #25 |
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Re: chrome dip vs. chrome plating
No that is not how plastic parts have been chromed. That is how mirrors have been made.
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11-25-2012, 02:12 AM | #26 | |
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Re: chrome dip vs. chrome plating
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11-25-2012, 08:37 AM | #27 |
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Re: chrome dip vs. chrome plating
Hey garage . . bite me. I don't need your criticism, not wanted at all.
Dave, I have a metallurgy background in my training. I understand some things in this area. This is WHY I keep asking. You have noticed my question marks? I have several items that have been flash chromed, at this moment. I can peel a piece off for you. And if this flash operation is as good as triple plating, then why is triple done in the first place , especially on a new part? And I'm not comparing hot in an engine to hot outside alone . I'm throwing in the UV. That's not a consideration? because if not, it seems everyone has been doing this wrong all the years.
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11-25-2012, 08:45 AM | #28 | |
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Re: chrome dip vs. chrome plating
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UV has absolutely nothing to do with copper/nickel/chrome electroplating performance. Last edited by fordgarage; 11-25-2012 at 09:33 AM. |
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11-25-2012, 08:53 AM | #29 | |
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Re: chrome dip vs. chrome plating
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The ABS part is etched to remove the butadiene and create porosity. The parts are treated and copper plated to provide a mechanical interlock to the etched plastic substrate, and to provide a metallic base coating. Then they are nickel plated to provide the color. They are then chrome plated (near transparent) to provide a hard surface protection for the nickel below. Yes, chrome plastic parts like a car grille are copper/nickel/chrome over plastic. A truck bumper is copper/nickel/chrome over a steel stamping. I already explained how stainless was plated. This likely won't mean much to you, but others may be interested. |
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11-25-2012, 09:00 AM | #30 |
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Re: chrome dip vs. chrome plating
To the original poster,
If you are doing a driver and want to have nice looking bumpers; re-chroming (any process) is comparably more expensive than the Stainless Steel types that are offered by most of the Model A vendors. I've seen powder coat, it looks OK but it doesn't shine like chrome, the cost may sway a decision. Good luck, GW Wow, I just checked the price of stainless bumpers, they went thru the roof! My statement would be good 15 years ago when I bought them. Last edited by gweilbaker; 11-25-2012 at 09:29 AM. Reason: It's a b!#ch getting old. |
11-25-2012, 10:09 AM | #31 |
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Re: chrome dip vs. chrome plating
Thanks to all of you. This discussion has cleared up a lot of questions I have had on plating. I won't give any tech advice though because I don't want my feelings hurt. I am a very sensitive guy.....
Maybe on these tech issues the posters should give their creds ahead of time so replies can be more useful? Oh jeez, there I go, now somebody is going to hurt my feelings......... |
11-25-2012, 10:20 AM | #32 |
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Re: chrome dip vs. chrome plating
Here is but one example of my experience with a chrome that has not been applied in a three step process. call it what you want . . but here are the results. I believe we all have/have been in touch with items chromed this way. Hundreds of items throughout your home or commercial businesses. I completely understand the reason based on usage and cost . . but I don't want them on the exterior of my vehicles. This is over stainless steel in this example.
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11-25-2012, 10:28 AM | #33 |
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Re: chrome dip vs. chrome plating
If it means anything Pete. I restored a couple of Schwin Stingray Bikes a while back. Sent two sets of handlebars out to a local chrome shop. Got them back and while pushing the handgrips on the ends of the bars, there went the chrome curling up and peeling off, just like your picture. No copper, no nickel, just plain shiny steel underneath. You just cant beat a nice copper, nickel, chrome job as far as i am concerened. But its getting scarce here in Cali. Just my two cents.
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11-25-2012, 10:37 AM | #34 |
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Re: chrome dip vs. chrome plating
No one ever said that any process would give good results if it was performed incorrectly.
There are lots of things in electroplating which can easily 'go wrong' or be performed wrong including cleanliness, chemicals and concentrations, time, temperatures, voltage, and current. Peeling chrome is not an indictment of the topic, but of how it was performed on that particular part and process. |
11-25-2012, 10:38 AM | #35 |
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Re: chrome dip vs. chrome plating
I do Stingrays myself I'm trying to sort info here my. When I see a hard chromed part, I know there are no anodic layers to help with long term exposure. In a mechanical setting ( engine or such as I have brought up earlier ) those conditions are different. Oil will help keep the rusting processes controlled. But when parts are exposed to the outside weather conditions, anodic layers are needed. That is why , I thought, hard chroming was saved for stainless and other similar metal alloys that don't need the same anodic properties. But when hard chroming is done on my "normal" steels, it is a cheap coating at best. That is what I would like explained to me, and it is why I thought hard chromes is extensively considered an "engineering" finish rather than an exterior finish. Exterior finish is what we all want on out cars.
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11-25-2012, 10:40 AM | #36 | |
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Re: chrome dip vs. chrome plating
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11-25-2012, 10:43 AM | #37 |
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Re: chrome dip vs. chrome plating
They still "chrome" plastic in the same way you describe, BUT, there are newer techniques used today as well. Some of the plastic coatings are pretty damn cool, the way they are applied. Covering are applied in water . . to name one technique and it gives you the ability to cover in a "chrome" look or about any other look you want.
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11-25-2012, 10:49 AM | #38 | |
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Re: chrome dip vs. chrome plating
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Its main feature is its very high reflectivity, approaching silver, but it is very fragile and is also sensitive to environmental and chemical vapor exposure. It works reasonably well in sealed (tyvek vented) automotive headlamps, and is currently how most reflectors are finished for the last 20 years. Chrome plated plastics are done as I described earlier. The plastic is first etched to create a porous surface to bond to, and it is treated with a tin/paladium catalyst to make it electrically active for the copper plating strike. It is triple chrome plated, essentially the same as a metal part like zinc or steel. If it is truly chrome plated, the primary reason the chrome peels is due to failure of the interface between the plastic and the copper. This is usually related to improper etching of the plastic resulting in the "wrong" porosity size and density of the etched surface. Also, plated plastic is also sensitive to differential thermal expansion rates between the plastic and metal finish. They expand and contract at different rates during temperature changes, and this exerts additional stress on the bond interface. |
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11-25-2012, 10:57 AM | #39 |
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Re: chrome dip vs. chrome plating
This is one of the processes to which I was referring. Your finish is basically limited to whatever you can have printed on the coating, thus limitless. They do a wood finish in the video, but a reflective mylar looks like chrome.
https://www.youtube.com/watch?v=zIBiG_u0_wA
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11-25-2012, 11:09 AM | #40 | |
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Re: chrome dip vs. chrome plating
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Based on your many posts, you seem to have an extremely loose definition of the word 'chrome'. However, chrome is not the many other things you have been talking about. Chrome is a very specific material, which can be made to exhibit several appearances. High luster bright chrome is the finish appearance primarily used on the Model A and most other automotive applications, in addition to a few satin and butler finish versions. And FYI, mylar is polyester film. It is not chrome, it does not look anything like chrome, and it cannot be chrome plated. But if it is close enough for you, great! |
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11-25-2012, 01:19 PM | #41 |
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Re: chrome dip vs. chrome plating
We were asked about plastic pieces, vacuum chrome finishes like are used on dash bezels etc. This is a new process that would work the same on those types of plastic pieces. I was answering someone else here . . again, stay out of it if not directed at you. I can't be more direct.
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11-25-2012, 05:28 PM | #42 | |
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Re: chrome dip vs. chrome plating
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"I was answering someone else here" Like who? How would anyone know who your comments are directed to (not at), since you don't say. You don't quote anything/any one in your posts, or make any proper pronoun references, so it is not clear who are you are referring to. BTW, What new process? What is a "new process that works the same"? Geez what a case. |
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11-25-2012, 05:33 PM | #43 |
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Re: chrome dip vs. chrome plating
Has anyone tried woodgraining their bumpers using one of the hydrographic printing immersion film transfer processes?
I am getting tired of chrome appearance bumpers and want a new look. |
11-25-2012, 05:51 PM | #44 |
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Re: chrome dip vs. chrome plating
To anyone else interested here, I'd be glad to discuss anything having to do with this thread. I'm always interested in learning and teaching. I will not acknowledge a certain member here, but anyone else I'd be happy to discuss with.
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11-25-2012, 09:42 PM | #45 |
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Re: chrome dip vs. chrome plating
I think your comments have been in direct opposition to what you say above - "I'm interested in learning..." This forum may get testy, but usually interesting, when egos get involved!
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11-25-2012, 10:21 PM | #46 | |
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Re: chrome dip vs. chrome plating
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If you think about it, ALL chrome eventually succumbs to a combination of the elements, neglect & abuse. When cars had chrome I used to spend hours on my knees polishing bumpers and wheels and they pretty much all had stains & pits & peeling issues to at least some degree if the car was 5 or 6 years old. For Vince to get through the rigorous testing of such a large (albeit corrupt) company like GM and rectify their chrome troubles....and now proven 12yrs....I'd say they have the answer at least for that specific application. I've done some simple home plating with nickle & copycad and can appreciate the enormous amount of time and learning involved, heck it's WAY harder to plate than learning to spray paint. When my Model A bumpers go to the plater I'll want it done right, but I'll certainly look at new ideas for consideration. At the end of the day, without keeping the chrome clean and polished and oiled at every bolt hole I wouldn't expect it to look perfect after even a year. The chrome we're familiar with is just metal and is subject to the same corrosive attacks as any other metal if not cared for. If I can add one generalization, I don't see your average coked out Escalade driver/leaser as someone who lovingly cares for a roof rack. Last edited by Craig Lewis; 11-25-2012 at 11:57 PM. |
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11-27-2012, 01:34 PM | #47 |
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Re: chrome dip vs. chrome plating
Craig, are you serious? One example makes it right? Just as one example doesn't make it wrong either. We have to consider hundreds, thousands etc. Over the years, which has lasted longer in an exposed environment?
Also, I haven't seen anyone respond to the anodic properties of the materials used. It's a very important part of plating and why certain materials are used in plating. Eliminating this area is problematic. Explain to me why it isn't?
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11-27-2012, 04:31 PM | #48 |
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Re: chrome dip vs. chrome plating
This is a thread looking for a closure icon....
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11-27-2012, 05:05 PM | #49 |
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Re: chrome dip vs. chrome plating
That's a possibility, but why wouldn't you want to see the concerns addressed? Do you understand how and why plating is done? What anodic properties are why they are significant? If you have no interest, you don't have to visit the thread. Isn't that how threads work? Personally I would like the person who has been in the plating business to address these items. I don't know what you are expecting . .
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11-27-2012, 05:31 PM | #50 | |
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Re: chrome dip vs. chrome plating
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11-27-2012, 05:37 PM | #51 |
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Re: chrome dip vs. chrome plating
I was thinking of using a pressure treated 2X4. That would have the natural wood grain tossed in with all the little indentations. Cool!
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11-27-2012, 06:44 PM | #52 | |
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Re: chrome dip vs. chrome plating
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If you need further information, read a book called 'electroplating, surface finishing fundamentals' by Frederick Lowenheim or the 'cannings electroplating handbook' |
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11-27-2012, 08:57 PM | #53 |
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Re: chrome dip vs. chrome plating
Dave, I realize that chrome is passive. Its the steel beneath that isn't. Therefore nickel is there to protect the steel, and also give the deep shine that we expect from "chromed" items. How can a hard chroming process over standard carbon steels be considered acceptable when used in an environment that will eventually go through the chromium? Not to mention the fact that it will not be as shiny as people would expect. Its considered, hard chroming, industrial chroming for a reason. It's thick, but not beautiful. What am I missing here Dave? Has the process changed such that beauty and protection can be achieved with a process that was/is considered industrial ?
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11-27-2012, 09:04 PM | #54 |
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Re: chrome dip vs. chrome plating
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11-28-2012, 04:59 AM | #55 | |
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Re: chrome dip vs. chrome plating
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11-28-2012, 11:11 PM | #56 | |
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Re: chrome dip vs. chrome plating
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FWIW, I don't have a show car and bought polished SS bumpers from Mac's. I figured I would rue the day I bought chrome the first time I saw a spot of rust or a scratch. 8 years and the SS ones still look new. A '30/'31 complete front bumper from Mac's is $295 chrome and $347 stainless. I doubt you could rechrome your bumpers for anywhere near that, but a good chrome shop might give you a better job. Last edited by 5window; 11-29-2012 at 08:21 AM. |
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12-03-2012, 08:05 PM | #57 |
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Re: chrome dip vs. chrome plating
See guys, here is what you don't know about and why you should keep your opinions to yourself. Your "favorite poster" has been harassing me for a while now. It has been done with disrespectful private messages. I turned them over to the moderators. So when I make a comment to him that you don't "approve" of, you have no idea what has been going on. Its as simple as that. I have not wanted to mention any of this, have said nothing until now. But you guys seem you have the need to hit me for the stuff I have posted. I am a professional in the automotive business. I have been for over 30 years. I do not need the criticism that I have gotten from this "person". All I ask of you guys here is to stay on topic and lets talk cars. Don't make any comments directed at a person. Are we all in school still?
Dave I have no idea why you have decided to act this way. I've only asked questions and have been respectful to you . . . .
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Pete's Ponies Mustang RUSToration & Performance Last edited by PetesPonies; 12-03-2012 at 08:20 PM. |
12-03-2012, 09:54 PM | #58 |
BANNED
Join Date: May 2010
Posts: 25
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Re: chrome dip vs. chrome plating
Pot, meet kettle.
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12-03-2012, 11:19 PM | #59 |
Administrator
Join Date: Apr 2010
Location: Austin, TX
Posts: 670
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Re: chrome dip vs. chrome plating
I think it's time to start banning some folks. The drama is getting tired.
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12-03-2012, 11:55 PM | #60 |
Administrator
Join Date: May 2010
Location: DesMoines, Iowa
Posts: 108
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Re: chrome dip vs. chrome plating
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