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Chrome Plating Stainless Steel

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Q. I need technical info on chrome plating stainless steel and I can't find it anywhere.

Thanks,

Randy Blackledge
- Hannibal, Missouri, USA


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A. Hi, Randy.

Your question is a bit abstract because you could be referring to the flash chrome which has been put on stainless automobile trim, or the hard-chrome plating of stainless steel, or conventional decorative nickel-chrome plating on stainless. The latter is probably the most common.

You generally don't see literature on this specifically; rather you see literature on how to start the process of plating onto stainless up through a Wood's nickel strike and, separately, you see literature on the process of nickel-chrome plating. If you divide it up that way you'll probably find more than you have time to read :-)

Good luck!

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

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Q. I'm looking for information on the feasibility of industrial hard chroming the bores of 316 stainless steel rifle barrels. Is it technically possible?

Rodger Young
- Tacoma, Washington, USA


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A. I think you mean type 416 stainless steel rather than type 316 austenitic stainless.

Type 416R is the most common "stainless" steel used for rifle barrels, no so much because of enhanced resistance to corrosion, but because the sulphur in it (thus the "R") makes it easier to machine than the traditional 4130 or 4140 low alloy steels which are also commonly used for making gun barrels.

Joaquin Bustamante
aerospace - Tempe, Arizona, USA


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A. Hi, Rodger. The bores of large caliber guns, such as naval guns, have been hard chrome plated for 60 years. So any challenges you encounter will involve methods and sizes rather than concept, chemistry, or performance. Best of luck.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

November 14, 2012appended

Q. Dear Sir,
I have a client who wishes to chrome plate directly onto 304 grade stainless steel. What is the best method to activate the surface before plating ?
Many thanks,
Ken Osborne.

KEN OSBORNE
Consultant - AUCKLAND, NEW ZEALAND


November 14, 2012

A. Hi Ken. We appended your question to a previous, almost identical, thread.

Is this chrome plating a very thin anti-tarnish treatment for stainless steel, or are you talking about hard chrome plating of stainless steel? When you say "directly", presumably you are implying that the usual Wood's Nickel Strike is not acceptable to your client?

It's very hard to find, but if you are consulting on hard chrome plating, you might try to find a copy of Guffie's "Hard Chromium Plating", which offers ideas on this. Good luck..

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



December 6, 2012

Q. I am currently working on a project which requires 1000 units of 304L stainless steel welded tube .036 wall thickness. After the work is done, the tubes, about 6" each, require decorative polished chrome plating, preferably compliant with ASTM B-117 standard (~Cr>0.3um, Ni>12um). No spec for the finish surface.
Is this possible considering the base material, and will the cost be the same or higher than, say Cu-Ni-Cr on brass surface?
Thank you in advance.
I am an avid follower of this website.

F. Shakkour
- Birth Place of the beach boys
  ^- Privately contact this inquirer -^


First of two simultaneous responses -- December 7, 2012

A. The "l" makes the plating a lot tougher, since not much will stick to lead. Using a fluoride based acid etch should allow you to get decent plating with A woods nickel strike followed immediately by the chrome (with rinses).
It does need watching or it might etch the parts if chemistry/temperatures and time are not maintained.

The next worry is if you are polishing it, the parts need to pass a water break test after the alkaline cleaning step. Some polishes and polisher can burn organic material into the surface of the base metal and the plate will also peel from this.

James Watts
- Navarre, Florida

Second of two simultaneous responses -- December 8, 2012

A. T304 can be polished mirror bright and has good corrosion resistance. Why nickel-chrome plate it at all? You'll accomplish almost nothing in terms of appearance or corrosion resistance.

Stainless auto trim is sometimes given a Chrome flash after buffing. It's a simple process involving electrocleaning, proprietary activator, a few minutes of chrome plating.

jeffrey holmes Jeffrey Holmes, CEF
- Spartanburg, South Carolina


December 10, 2012

A. Uhhhh, James: The L in 304L means low carbon, not leaded.

But you already knew that.

Jeffrey Holmes, CEF
- Spartanburg, South Carolina

December 10, 2012

thumbsup2Darn that Shakkour and his distracting Beach Boys note!

I think it did the same to Jim as to me. Knocked my brain half out of gear, so when I returned to the question, I saw "Cu-Ni-Cr on brass surface" :-)

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

December 11, 2012

A. Unfortunately, you are correct. Even more unfortunate is that I had completely forgotten it when I answered.

So now the answer is proper cleaning, proper activation/etch and probably a woods nickel strike, then plate.

James Watts
- Navarre, Florida
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