Zinc [ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel Types, Test Period (Hours.) II, III, Designation: B − Standard . chaser shall state ASTM B, the date of issue, service . Corrosion Resistance—Zinc coatings with Types II, III. Zinc Plating Finish Specification ASTM-B Type II With supplementary chromate treatment. Type III With supplementary colorless chromate treatment.

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III is colorless and not expected to hold up as long as the colored II.

According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how. Aluminum with low alloying elements will show practically no color change. 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.

Surfaces to be painted should be ONLY lightly chromated. So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Did you ever get the answers you were looking for?


Color is gray white in plated condition. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. With phosphate conversion coatings. Olive green passivation is a chromate passivation in a green hue that gives excellent corrosion resistance ability hours in a salt spray test and is a good base for paint.

Zinc Coating

Smaller parts, including fasteners, tyype, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line. I have the exact same questions. To prevent formation of case during. The rust not only harms the aesthetically smooth look, but also its mechanic needs. Surfaces left-bare should be heavily chromated. Thickness Classes for Coatings: Ray Kremer Stellar Solutions, Inc.

Zinc Plating: ASTM B Type II vs. III

Does anybody know this info? To calculate it is very difficult, as the plating is a few molecules thick. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential. Yellow chromate should get 96 hrs to failure. Can be dyed practically any color or shade. The Zinc coating provides a smooth look as well as good anti-corrosive protection.

Rest in peace, Ken. 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.


IMC | Zinc Plating

Our Barrel Plating line is fully automated and digitally controlled with special programs, and individual tupe to manage cleaning, plating, and chromating operations. The type of passivation is determined according to the required characteristics, and is divided into groups:.

III zinc plating An ongoing discussion from through Thus, hardness can range from Vickers. A Iron or steel with zinc electroplate. Could you explain oi Corrosion Resistance Requirements Types. The coating is made according to demand, where the distribution is as follows: Had very high luster in fused condition.

ASTM B-633 Type II vs. III zinc plating

It does not cover zinc coated wire or sheets. Registered to ISO I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.

Also, I found out that the casting is painted after plating.