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Yellow chromate versus clear chromate

I am using a sheet metal part with a plating for a 70 °C application. Am I better off using clear (zinc, I think) chromate or yellow chromate? I have heard conflicting stories as to whether clear chromate can handle the temperature. Since cost is an issue, I would like to use the clear chromate coating if it will stand up to the temperature without turning to powder.

Don Dziubakowski
mfgr - Seven Hills, Ohio, USA
2004

Are you referring to zinc plated steel followed by a chromate conversion coating? If so, chromates clear or yellow will not retain its protective properties when exposed to 70 °C for a period of time. The coating dehydrates and cracks. If no zinc plating a chromate conversion coating will not work on steel. If you are inquiring about a zinc-zinc chromate primer, this will work at 70 °C.

Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics"
and "Plating ABS Plastics" eBay or AbeBooks affil links])
2004

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