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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All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. I am not getting aztm difference between this. 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.
Iridescent and Colorless passivation is thin and has low electrical resistance. You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet. As much as asstm last layer of the passivation is thin the electrical resistivity is low. The Standard default is gold for type II coatings unless otherwise specified. B63 is colorless and not expected to hold up as long as the colored II.
Zinc Plating: ASTM B Type II vs. III
Our plater said that he would be willing to go thicker on the clear. Yellow-iridescent Black Olive Green. In 24 years I have only been asked this question once before and I presume it involves phosphating over zinc plating for those heavy phosphating grammage applications, where normal phosphating will not provide enough zinc phosphate that is required in the deposit.
Surfaces to be painted should be ONLY lightly chromated. So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Also, I found out that the casting is painted after plating. The Zinc coating provides a smooth look as well as good anti-corrosive protection.
It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low.
Don Penzenik – Elkhart, Indiana. The electrical resistance of this green layer passivation is very high because it is thick in relative to atsm passivations. So if I’m interpreting this correct, there is both a color difference and a salt spray difference. No it does not imply that. Our Zinc coating is carried out according to: It definitely v633 Hex Chrome.
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.
Ray Kremer Stellar Solutions, Inc. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation. Zinc plating is usually considered a functional coating, not a decorative one. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
That seems a bit discretional to me. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye.
Does anybody know this info? The above entries are somewhat dated: Ken Vlach – Goleta, California.
How do you know if it is supposed to be Zinc Yellow or Zinc Clear? Go to main content. The coating is made according to demand, where the distribution is as follows: All I need to know is what color the types are.
Try using an acid astj chloride bath and see if the casting covers. I will be attending the ASTM B8 committee meetings in Philly later this week and will mention this letter to the sub-committee chair responsible for the Aatm spec. This applies to all metals.
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 exterior visual determined according to last layer. Zinc coating with colorless RoHS compliance passivation. Surfaces left-bare should be heavily chromated. Going with clear will make it difficult to tell what is clear chromated zinc vs.