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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Obviously, this must be clarified by the customer. III zinc plating A discussion started in but continuing through Q.
This applies to all metals. What process variation would produce these different results? So if I’m interpreting this correct, there is both a color difference and a salt spray difference. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.
I have the exact same questions. Ray Kremer Stellar Solutions, Inc. 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.
The ast 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.
You can ast, the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet. The answer is Yes. Our Zinc coating is carried out according to: Electrical charasteristics As much as the last layer b6633 the passivation is thin the electrical resistivity is low. Thank you for your hard work which the finishing world continues to benefit from. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
He passed away May 14, Rest in peace, Ken. A Blue with pale yellow is the best replacement for yellow as of now. Ken Vlach – Goleta, California. Don Penzenik – Elkhart, Indiana.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Iron metals atsm relative quickly, even in a non-corrosive environment. According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how. It still will have Hex Chrome. Mark Hollenbeck alloys – Muskegon, Michigan A. The exterior visual determined according to last layer. What type of zinc plating bath is your plater using? The rust not only harms the aesthetically smooth look, but also its mechanic needs.
Zinc plating is usually considered a functional coating, not a decorative one. Our plater said that he would be willing to go thicker on the clear. As much as the last layer of the passivation is thin the electrical resistivity is low. Zinc coating with colorful chromate passivation.
Hello Claudio and Doug, My compliments for an excellent round of questions! Olive green and Black n633 is thick and has high electrical resistance.
It’s not possible to diagnose a finishing problem or the hazards sstm an operation via these pages. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
Going with clear will make it difficult to tell what is clear chromated zinc vs. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
Does plating make that big a difference knowing that it’s going to be painted also? 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.
ASTM B-633 Type II vs. III zinc plating
The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. No, other colors may not be available if my presumption is right. That seems a bit discretional to me. Surfaces to be painted should be ONLY lightly wstm. Could you explain this? Any information would be well received.
It definitely implies Hex Chrome.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Can anyone give me some direction on how to get the customer to accept going to clear. Zinc coating with phosphate passivation. Iridescent and Colorless passivation is thin and has low electrical resistance. Colorful chromate passivation gives corrosion resistance ability of 96 hours according to ASTM B until white b6633 to parts used in a high corrosive environment —outdoor. Asttm are different passivation colors: The type of passivation is determined according to the required characteristics, and is divided into groups: