ASTM B Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. Buy ASTM B SPECIFICATION FOR ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL from SAI Global. ASTM B Type II and III zinc chromate plating Q&A’s. In my opinion a Mil-C- [link is to free spec at Defense Logistics Agency, ] plating.
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I am not getting the difference between this. Did you ever get the answers you were looking for? Zinc coating with colorful RoHS compliance passivation.
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. No, other colors may not be available if my presumption is right.
As a result of large-scale and long-range tests conducted by ASTM and other organizations, there is excellent information on the corrosion behavior of zinc and zinc coatings. Zinc coating with colorless RoHS compliance passivation. The electroplated article shall be clean and free of damage.
Subject the selected samples to the salt spray test; the length of time to be applicable for the type of supplementary coating shall be in accordance with the requirements of 7. The Standard default is gold for type II coatings unless otherwise specified.
August 31, A. This guide provides for two plans: When such areas are designated, and thus made subject to minimum thickness requirements, the purchaser and the manufacturer shall recognize the necessity for either thicker fdee on other areas or for special racking. As the USA moved toward metric fasteners, for a while there was a move to dye them blue.
The purchaser retains the right to perform any of the inspections and tests set forth in this speci?
What do you say? Kaushik, The “Types” define supplementary finishes to be done after the plating. Zinc coating with phosphate passivation.
Decorative charastreistics The exterior visual determined according to last layer. 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.
When Test Methods BBor B are used, remove the supplementary treatment prior to testing. Could you explain this? How do you know if it is supposed to be Zinc Yellow or Zinc Clear? We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate.
These methods would include BBand B Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs.
Can anyone give me some direction on how to get the customer to accept going to clear. I have the exact same questions. Thank you for your hard work which the finishing world continues to benefit from. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
If these heat treatments are not required, the purchaser shall specify in the ordering information their exception, 5. Conditions affecting the electroplating of specimens, including the spacing, plating media, bath agitation, temperature, etc.
Current edition approved Jan. 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. The problem may not be with the chromate at all. Surfaces to be painted should be ONLY lightly chromated. Yellow-iridescent Black Olive Green. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.
To minimize problems of this sort, the speci?