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Clear & Yellow zinc plating

Clear & Yellow zinc plating

Clear & Yellow zinc plating

(OP)
still having trouble getting the facts straight. . .
Is type II colorless (clear) and type III yellow (with added chromates?)
I beseech thee....for clarification. . . . .

RE: Clear & Yellow zinc plating

According to ASTM B 633 Standard Specfication for Electrodeposited Coatings of Zinc on Iron and Steel, there are four "types":

Type I - As-plated without supplementary treatment

Type II - With colored chromate conversion coatings

Type III - With colorless chromate conversion coatings

Type IV - With phosphate conversion coatings

I recommend you obtain a copy of this document if you intend to specify these types of coatings.  It is available directly from ASTM at http://www.astm.org/.

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