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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Try using an acid zinc chloride bath and see if the casting covers.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. 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. Perhaps some confusion with Service Condition SC 2 moderateaetm indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.
Colorless V633 compliance passivation gives corrosion resistance ability of 72 hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor.
Zinc coating with phosphate passivation. II says “colored asttm coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. Rest in peace, Ken.
Zinc Plating: ASTM B Type II vs. III
Is this process done in zstm United States, and if so by whom? The above entries are somewhat dated: Olive green and Black passivation is thick and has high electrical resistance. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Can anyone give me some direction on how to get the customer to accept going to clear.
ASTM B-633 Type II vs. III zinc plating
To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. How do you know if it is supposed to be Zinc Yellow or Zinc Clear?
The rust not only harms the aesthetically smooth look, but also its mechanic needs. III b33 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
III zinc plating A discussion started in but continuing through Q. The coating is made according to demand, where the distribution is as follows: To calculate it is very difficult, as the plating is a few molecules thick. Our plater would like to go to a 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. Is there any colour difference OR is there any Salt spray difference? Electrical charasteristics As much as the last layer of the passivation xstm thin the electrical resistivity is low.
Until a very few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye.
Put the chromate on light. Any information would be well n633. Don Penzenik – Elkhart, Indiana. Obviously, this must be clarified by the customer.
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.
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.
The black layer has also additional target —prevention of light v633 from the part and is used for optical parts.
A light yellow would be better than a clear. It definitely implies Hex Chrome. The Standard default is gold for type II coatings unless otherwise specified. Yellow-iridescent H633 Olive Green.