Summary for zinc plating standards Discussion
zinc plating standards are clarified in this thread: ASTM B117 is for salt spray testing, not the plating itself, while ASTM B633 is the standard for electroplated zinc coatings. Toby Padfield notes that ISO 2081 is equivalent to ASTM B633 and ISO 9227 is equivalent to ASTM B117, and says both ASTM standards can be obtained directly from ASTM. A later question asks for ASTM B633-SC3 Type II, and the site editor notes that these specifications are copyrighted and must be purchased rather than obtained free. In a separate question about blotchy or uneven pre-plated zinc on CRS, Ted Mooney explains that there are no implied aesthetic standards; the right approach is to start with a written specification, preferably an accepted industry standard, then add any extra appearance requirements carefully. He recommends discussing the discoloration and blotchiness with the plating shop to identify the cause.
Q. Where can I get the standards for Zinc Plating in accordance to ASTM B117 standard.
Thanking you in advance.
TEXMO PRECISION CASTINGS
iNVESTMENT CASTINGS MANUFACTURER – Coimbatore, Tamilnadu, India
2003
A. ASTM B117 is a standard for conducting salt spray testing. ASTM B633 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 is equivalent to ASTM B633 and
ISO 9227 is equivalent to ASTM B117.
Toby Padfield
Automotive module supplier – Michigan
2003
I need a copy of the ASTM B633-SC3 Type II standard for zinc coating.
Donald Brey
– Deerfield Beach, Florida, USA
2007
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
br
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, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
Should I specify zinc plating per ISO 2081 or per ISO 14713?
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 and ISO 14713-1. Can anyone help me with the differences between both standards and which to follow for electroplating of Zn on Fe substrate?
RANJIT NAIR
– UDAIPUR, RAJASTHAN, India
October 31, 2019
A. Hi Ranjit. It can’t hurt to get a copy of ISO 14713-1, but it appears to be “Guidelines and recommendations” rather than a specification. I’d go with ISO 2081
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
October 2019
Thank you so much Ted for the prompt reply. It was really helpful.
RANJIT NAIR [returning]
– UDAIPUR, RAJASTHAN, INDIA
November 4, 2019
adv.
