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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Rest in peace, Ken. How do you know if it is supposed to be Zinc Yellow or Zinc Clear?
The type of passivation is determined according to the required characteristics, and is divided into groups: Mark Hollenbeck alloys – Muskegon, Michigan A. It definitely asgm Hex Chrome. I have the exact same questions. Olive green and Black passivation is thick and has high electrical resistance. Supplementary treatments shall be in accordance with Recommended Practice B Try using an acid zinc chloride bath and see if the casting covers.
The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. High strength steels tensile strength greater than MPa shall not be electroplated. 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. III is colorless and not expected to hold up as long as the colored II.
To minimize your searching efforts and to b633–85 multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Going with clear will make it difficult to tell what is clear chromated zinc vs. No it does not imply that.
ASTM B-633 Type II vs. III zinc plating
Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low.
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Hi, I recently received 2 batches of parts from two separate platers using this specification. No, other colors may not be available if my presumption is right.
It does not cover zinc-coated wire or sheets. August 31, A. What do you say? Our plater said that he would be willing to go thicker on the clear. A Iron or steel with zinc electroplate. Don Penzenik – Elkhart, Indiana. 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. Ray Kremer Stellar Solutions, Inc.
From beautiful Pine Beach New Jersey: I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory.
But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Please forgive any resultant atm or failures of chronological order. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Zinc plated components vary from one industry to another. The Standard default is gold for type II coatings unless otherwise specified.
Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths.
Zinc Plating: ASTM B Type II vs. III
Thank you for your hard work which the finishing world continues to benefit from. Iron metals rust relative quickly, even in asttm non-corrosive environment. The rust not only harms the aesthetically smooth look, but also its mechanic needs.
The problem may not be with the chromate at all. I am not getting the difference between this. What process variation would produce these different results? Surfaces left-bare should be heavily chromated. A Blue with pale yellow is the best replacement for yellow as asrm now. So if you need to color asmt, you need to do it with a requirement for compliance with sample parts — not a verbal description.
Any information would be well received. The Zinc coating provides a smooth look as well as good anti-corrosive protection.
Zinc coating with colorful chromate passivation. Did you ever get the answers you were looking for? 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. Can anyone give me some direction ast how to get the customer astj accept going to clear.
Zinc plating is usually considered a functional coating, not a decorative one. As the USA moved toward metric fasteners, for a while there was a move to dye them blue.