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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The answer is Yes. The exterior visual determined according to last layer. Hello Claudio and Doug, My compliments for an excellent round of questions! III is colorless and not expected to hold up as long as the colored II.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Put the chromate on light. Regards, Ted Mooney, P. Corrosion resistance B6333 chromate passivation gives corrosion resistance ability of 96 hours according to ASTM B until 133 spots-intended to parts used in a high corrosive environment —outdoor.
Please forgive any resultant repetition or failures of chronological order. It definitely implies Hex Chrome. Regarding the question asked in letter ; Type II zinc plating vs. Rest in peace, Ken. Zinc coating with colorful chromate passivation. 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.
Does anybody know this info? The above entries are somewhat dated: III zinc plating A discussion started in but continuing through Q.
The coating is made according to demand, where the distribution is as follows: Olive Drab chromate is hrs. The Zinc coating provides a smooth look as well as good anti-corrosive protection. Try using an acid zinc chloride bath and see if the casting covers.
I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry. I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. Could you explain this? A light yellow would be better than a clear.
ASTM B-633 Type II vs. III zinc plating
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. Does plating make that big a difference knowing that it’s going to be painted also? To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing.
Did you ever get the answers you were looking for? Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. Perhaps some confusion with Service Condition Ast, 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. All information presented is for general reference and does not represent a professional opinion nor the policy satm an author’s employer. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations.
Surfaces to be painted should be ONLY lightly chromated. No it does not imply that. Decorative charastreistics The exterior visual determined according to last layer.
There are different passivation colors: Ken Vlach – Goleta, California. Yellow-iridescent Black Olive Green. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.
Mark Hollenbeck alloys – Muskegon, Michigan A. The rust not only harms the aesthetically smooth look, but also its mechanic needs. Zinc coating with colorless RoHS compliance passivation. As the USA moved toward metric fasteners, for a while there was a move to dye them blue.
Thank you for your hard work which the finishing world continues to benefit from. Is there any colour difference OR is there any Salt spray difference? Olive green and Black passivation is thick and has high electrical resistance.
Zinc coating with phosphate passivation.
Zinc Plating: ASTM B Type II vs. III
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Yellow chromate should get 96 hrs to failure.
The problem may not be with the chromate at all. 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.