ASTM B Type II and III zinc chromate plating Q&A’s. greater corrosion resistance is required, e.g., for SC3 & SC4 (13 & 25 microns zinc, respectively). 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). ASTM A/AM Low and Intermediate Tensile Strength Carbon Steel Plates .. ASTM B Electrodeposited Coatings of Zinc on Iron and Steel.
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Is there any colour difference OR is there any Salt spray difference? I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. Go to main content.
III is colorless and not expected to hold up as long as the colored II. All I need to know is what color the types are. The Zinc coating provides a smooth look as well as good anti-corrosive protection. A Blue with pale yellow is the atsm replacement for yellow as of now.
Surfaces left-bare should be heavily chromated. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.
August 31, A. Any information would be well received. There are different passivation colors: Surfaces to be painted should be ONLY lightly chromated.
Kaushik, The “Types” define supplementary finishes to be done after the plating. Zinc coating with colorful chromate passivation.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Our plater would like to go to ast 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.
To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Yellow-iridescent Black Olive Green. I will be attending the ASTM B8 committee meetings in Philly later this week and will 113 this letter to the sub-committee chair responsible for the B spec.
What type of zinc plating bath is your plater using? Can anyone give me some direction on how to get the customer to accept going to clear.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Does plating make that big a difference asmt that it’s going to be painted also? We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate.
Regarding the question asked in letter ; Type II zinc plating vs. From beautiful Pine Beach New Jersey: The answer is Yes. Olive green and Black passivation is thick h633 has high electrical resistance. The above entries are somewhat dated: The type of passivation is determined according to the required characteristics, and is divided into groups: Iron metals rust relative quickly, even in a non-corrosive environment. The rust not only harms the aesthetically smooth look, but also its mechanic needs.
As the USA moved toward metric fasteners, for a while there was a move to dye them blue. Type II chromates are more commonly used where greater corrosion resistance is required, e.
Don Penzenik – Elkhart, Indiana. This applies to all metals.
But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye.
Different brands of chromate conversion chemistry, possibly different plating 31 acid zinc vs. Decorative charastreistics The exterior visual determined according to last layer.
ASTM B-633 Type II vs. III zinc plating
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. 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. 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 plating is usually considered a functional coating, not a decorative one. Iridescent and Colorless passivation is thin and has low electrical resistance. Also, some yellow chromates are clear w. 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.
The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.
Ken Vlach – Goleta, California. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths.