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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Thickness Classes for Coatings: The type of passivation is determined according to the required characteristics, and is divided into groups: A Blue with pale yellow is the best replacement for yellow as of now. I’m not a zinc plater, but ‘Type II Clear’ seems typf. The exterior visual determined according to last layer.

Color will vary from light tan to black depending on alloy and thickness. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.

Zinc coating with colorless RoHS compliance passivation. Specification covers standard recommendation practice for cleaning and de-scaling stainless steel parts, equipment and systems. Our plater would like to go to a astn-b633 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.

Decorative charastreistics The exterior visual determined according to last layer. Can be dyed practically any color or shade. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. Color will vary with alloy.


The coating is made according to demand, where the distribution is as follows: Try using an astm-b63 zinc chloride bath and see if the casting covers. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.

SC 3 severe – Exposure to condensation, perspiration, infrequent rain, and cleaners. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments.

Zinc Plating: ASTM B Type II vs. III

So if I’m interpreting this correct, there is both a color difference awtm-b633 a salt spray difference. No, other colors may not be available if my presumption is right.

Zinc ASTM-B This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion. Did you ever get the answers you were looking for? Also, I found out that the casting is painted after plating.

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.

What type of zinc plating bath is your plater using? The Zinc coating provides a smooth look as well as good anti-corrosive protection. Corrosion resistance is good for coatings over.

ASTM B-633 Type II vs. III zinc plating

The Standard default is gold for type II coatings unless otherwise specified. III zinc plating A discussion started in but continuing through Q. To calculate it is very difficult, as the plating is a few molecules thick.


Olive green and Black passivation is thick and has high electrical resistance. Where maximum serviceability or special properties are required, consult metal finisher for best alloy choice.

Barrel Zinc – Finishes – Professional Plating Inc.

As specified on drawing. The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation. Don Penzenik – Elkhart, Indiana. Yellow chromate should get 96 hrs to failure. It definitely implies Hex Chrome. Please forgive any resultant repetition or failures of chronological order. SC 4 very severe. A heavy chromate will shear under paint and cause the paint to peel. Is there any colour difference OR is there any Salt spray difference?

Colorful RoHS compliance passivation gives corrosion resistance ability of hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor.

For urgent projects, we can turn the work around even faster with no loss of quality. All I need to know is what color the types are. He passed away May 14, Can be similar to stainless steel in iu, or can be dull gray or light gray almost white color.