Clear & Yellow zinc plating 1

[rubepierre]

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

 

[TVP]

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/.