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Q & A about Zinc Plating Standards

A discussion started in 2003 but continuing through 2019


Q. Where can I get the standards for Zinc Plating in accordance to ASTM B117 standard.

Thanking you in advance.



A. ASTM ASTM B117 [link by ed. to spec at TechStreet] is a standard for conducting salt spray testing. ASTM B633 [link by ed. to spec at TechStreet] is the standard for electroplated zinc coatings. You can obtain both of these standards directly from ASTM by going to their website. FYI, ISO 2081 [link by ed. to spec at TechStreet] is equivalent to ASTM B-633 and ISO 9227 [link by ed. to spec at TechStreet] is equivalent to ASTM B-117.

Toby Padfield
Automotive module supplier - Michigan

2007 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

I need a copy of the ASTM B633 [link by ed. to spec at TechStreet] -SC3 Type II standard for zinc coating.

Donald Brey
- Deerfield Beach, Florida, USA

Ed. note: We've linked your inquiry directly to a commercial source for specs, or you can also buy it from the ASTM site. These specs are copyrighted works that must be purchased; there is no place to get them for free. Good luck.

October 7, 2011

Q. What are the aesthetic standards for pre-plated Zinc on CRS? Our supplier has given us many pieces that are darker on one portion and much lighter on others. Other pieces look blotchy.

Mike Kovacich
- Dublin, California, United States

A. Hi Mike. Unfortunately there are no "implied industry standards". It starts with a specification, whether written completely by yourself (usually not a good idea), or by by an accepted standards-writing organization, or one based on that with your own additional requirements added on.

If the "standard standard" doesn't specify aesthetics to the degree that you require, you can add additional requirements but they can be very tricky. In the old days "sample boards" were often prepared: "not yellow enough"..."acceptable"..."too yellow", but nobody likes them "we use chromates from vendor A, and you've based it all on vendor B"..."our inspector doesn't agree with your inspector"..."the exposed samples on the sample board have corroded over time".

I'd suggest picking a good industry standard and carefully reviewing it to see whether you think it will solve the problem, then sitting down with the plating shop and discussing the cause of the blotchiness and darkness variation.

Luck & Regards,

Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

Should I specify zinc plating per ISO 2081 or per ISO 14713?

October 31, 2019

Q. I am looking for the standard to follow for the electroplating of Zn on mild steel components. I found two standards for the same, i.e., ISO 2081 [link by ed. to spec at TechStreet] and ISO 14713-1 [link by ed. to spec at TechStreet]. Can anyone help me with the differences between both standards and which to follow for electroplating of Zn on Fe substrate?


October 2019

A. Hi Ranjit. It can't hurt to get a copy of ISO 14713-1 [link by ed. to spec at TechStreet], but it appears to be "Guidelines and recommendations" rather than a specification. I'd go with ISO 2081 [link by ed. to spec at TechStreet]


pic of Ted Mooney
Ted Mooney, P.E. RET - Pine Beach, New Jersey
Striving to live Aloha

November 4, 2019

thumbs up sign Thank you so much Ted for the prompt reply. It was really helpful.

RANJIT NAIR [returning]

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