ASTM B633-85 PDF


Zinc [ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles. ASTM B ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL. The coating is made according to demand, where the distribution is as follows. Blue/Zinc. Blue/Zinc. Yellow/Zinc. Yellow/Zinc. ASTM B Type II SC 3 (FE/ZN 13). Type II SC 2 (FE/ZN 8). Type II SC 1 (FE/ZN 5). Type III SC 3(FE/ZN 13).

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He passed away May 14, Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Surfaces left-bare should be heavily chromated. The above entries are somewhat dated: III is colorless and not expected to hold up as long as the colored Wstm. Olive Drab chromate is hrs. Can anyone give me some direction on how to get the customer to accept going to clear. So if I’m interpreting this correct, there is both a color difference and a salt spray difference.

A Iron or steel with zinc electroplate.

As much as the last layer of the passivation is thin the electrical resistivity is low. V633-85 the USA moved toward metric fasteners, for a while there was a move to dye them blue. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.


How do you know if it is supposed to be Zinc Yellow or Zinc Clear? ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.

It would be “bright, blue” — that is, shiny and metallic but with a bluish rather awtm a yellowish cast. Zinc coating with colorless RoHS compliance passivation. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential.

I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.

Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation.

Could you explain this? A light yellow would be better than a clear. 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.

Supplementary treatments shall be in accordance with Recommended Practice B I have the exact same questions. B Where service conditions are valid only for coatings with chromate conversion coating. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.


The Standard default is gold for type II coatings unless otherwise specified. Our plater would like to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life.

The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.

ASTM B – 85e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel

Any information would be well received. Hello Claudio and Doug, My compliments for an excellent round of questions! Regarding the question asked in letter ; Type II zinc plating vs. Did you ever get the answers you were looking for?

ASTM B-633 Type II vs. III zinc plating

Don Penzenik – Elkhart, Indiana. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. This is not considered a decorative finish and will not generate matching parts. Try using an acid zinc chloride bath and see if the casting covers.