Designation: B − Standard . chaser shall state ASTM B, the date of issue, service . Corrosion Resistance—Zinc coatings with Types II, III. ASTM B ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL. Type II, Zinc coating with colorful chromate passivation, 96 hours 48 hours. Zinc Plating Finish Specification ASTM-B Type II With supplementary chromate treatment. Type III With supplementary colorless chromate treatment.

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It still will have Hex Chrome. Color will vary with alloy. Regards, Ted Mooney, P.

Zinc Plating: ASTM B Type II vs. III

Don Penzenik – Elkhart, Indiana. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. Surfaces to be painted should be ONLY lightly chromated. Also for inside dimensions and irregular shapes where assembly tolerances need uniformity provided by Electroless process. Zinc coating with colorful RoHS compliance passivation. typpe

Available colors are iridescent and black Colorless chromate passivation gives corrosion resistance ability of 12 hours according to ASTM B until white spots-intended to parts used in a light corrosive environment —indoor.

Anodic-for high carbon martensitic steels. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. Our Barrel Plating line is fully automated and digitally controlled with special programs, and individual recipes to manage cleaning, plating, and chromating operations. Class 3 Class 3 chemical coatings are intended as a corrosion preventive film from electrical and electronic applications where low resistance contacts are required.

Color will vary from light tan to black depending on alloy and thickness. The rust not only harms the aesthetically smooth look, but also its mechanic needs.


Can anyone give me some direction on how to get the customer to accept going to clear. Hi, I recently received 2 batches of parts from two separate platers using this specification. The problem may not be with the tyle at all. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.

Barrel Zinc – Finishes – Professional Plating Inc.

Color is gray white in plated condition. Iron metals rust relative quickly, even in a non-corrosive environment. Aluminum with low alloying elements will show practically no color change. Can be dyed practically any color or shade. The electrical resistance hype this green layer passivation is very high because it is thick in relative to other passivations.

Can be used as an electrical insulation coating. Type Sstm-b633 chromates are more commonly used where greater corrosion resistance is required, e. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. For corrosion protection Grade A: Yellow-iridescent Black Olive Green. A Iron or steel with zinc electroplate. Astmm-b633 in peace, Ken. A Blue with pale yellow is the best replacement for yellow as of now.

The Zinc coating provides a smooth look as well as good anti-corrosive protection. Where maximum serviceability or special properties are required, consult metal finisher for best alloy choice.

Our plater said that he would be willing to go thicker on the clear. A heavy chromate will shear under paint and cause the paint to peel.

Zinc Coating

To determine the nature of accuracy or revision level please verify above data with current releases: Corrosion resistance Colorful chromate passivation gives corrosion resistance ability of 96 hours according to ASTM B until white spots-intended to parts used in a high corrosive environment —outdoor.


Corrosion resistance is good for coatings over.

The coating is made according to demand, where the distribution is as follows: The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation. Minimum weight Type II coatings.

Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Mark Hollenbeck alloys – Muskegon, Michigan A. I will be attending the ASTM B8 committee meetings in Astm-h633 later this week and will mention this letter to the sub-committee chair responsible for the B spec. As specified on drawing.

All parts with ultimate tensile strength M.

ASTM B-633 Type II vs. III zinc plating

As the USA moved toward metric fasteners, for a while there was a move to dye them blue. What type of zinc plating bath is tpye plater using? Zinc and Zinc alloys, such as zinc-nickel will surely play a more significant role as metals such as Cadmium are destined for the elements’ Valhalla. Decorative charastreistics The exterior visual determined according to last layer. Plates uniformly in recesses and cavities does not build up on edges. 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.

All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.