ASTM B Type II and III zinc chromate plating Q&A’s. *Note: Answer is based upon pre versions of B (, , ). The revision. Hi, can anyone advise if the ASTM std ASTM B [link by ed. to spec at TechStreet] std specification for Electroplated coatings on Iron and steel, the . ASTM Be1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel Scope This specification covers requirements .

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SC 4 very severe.

ASTM B633-98 std: Electrodeposited coating of Zinc

It does not cover zinc-coated wire or sheets. Please forgive any resultant repetition or failures of chronological order. All I need to know is what color the types are. The end user must decide when a part fails, at “white rust” corrosion the chromate has failed or red rust both the chromate and the zinc are gone exposing the base metal.

This applies to all metals.

ASTM B – 98 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

Zinc and Zinc alloys, such as b633–98 will surely play a more significant role as metals such as Cadmium are destined for the elements’ Valhalla. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.

Until a very few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye. B Where service conditions are valid only for coatings with chromate conversion coating.


Try using an acid zinc chloride bath and see if the casting covers. A Blue with pale yellow is the best replacement for axtm as of now.

To calculate it is very difficult, as the plating is a few molecules thick.

To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. August 31, A. The above entries are somewhat dated: High strength steels tensile strength greater than MPa shall not be electroplated. Kaushik, The “Types” define supplementary finishes to be done after the wstm.

That seems a bit discretional to me. Surfaces left-bare should be heavily chromated. He passed away May 14, A Iron or steel with zinc electroplate.

I am not getting the difference between this. Also, some yellow chromates are clear w. Rest in peace, Ken. No, other colors may not be available if my presumption is right. A light yellow would be better than a clear. It would be “bright, blue” — that is, shiny and metallic but with a sstm rather than a yellowish cast. III is colorless and not expected to hold up as long as the colored II.

To determine the nature of accuracy or revision level please verify above data with current releases: Corrosion Resistance Requirements Types. Also, I found out that the casting is painted after plating.


Did you ever get the answers you were looking b6339-8 Can anyone give me some direction on how to get the customer to accept going to clear. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. What type of zinc plating bath is your plater using? The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. G633-98 chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.

Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 wstm and is commonly clear chromated Type III.

Obviously, this must be clarified by the customer. Thank you for your hard work which the finishing world continues to benefit from. Olive Drab chromate is hrs.

ASTM B-633 Type II vs. III zinc plating

Mark Hollenbeck alloys – Muskegon, Michigan A. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. Regards, Ted Mooney, P.