ASTM B Type II and III zinc chromate plating Q&A’s. *Note: Answer is based upon pre versions of B (, , ). The revision. Hi, can anyone advise if the ASTM std ASTM B [link by ed. to spec at TechStreet] std specification for Electroplated coatings on Iron and steel, the . ASTM Be1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel Scope This specification covers requirements .
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To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Obviously, this must be clarified by the customer. How do you know if it is supposed to be Zinc Yellow or Zinc Clear? Also, some yellow chromates are clear w. It still will have Hex Chrome. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.
So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description. Don Penzenik – Elkhart, Indiana. Zinc and Zinc alloys, h633-98 as zinc-nickel will surely play a more significant role as metals such as Cadmium are destined for qstm elements’ Valhalla. Olive Drab chromate is hrs. What do you say? Zinc plated components vary from one industry to another.
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Thank you for your hard work which the finishing world continues to benefit from. In 24 years I have only been asked this question aztm before and I presume it involves phosphating over zinc plating for those heavy phosphating grammage applications, where normal g633-98 will not provide enough zinc phosphate that is required in the deposit.
Our plater said that he would be willing to go thicker on the clear.
III zinc plating A discussion started in but continuing through Q. 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 B spec.
Zinc Plating: ASTM B Type II vs. III
I need to specify atsm that do not contain Hexavalent Chromium for parts that will be used in the automotive industry. II says “colored chromate coatings” meeting 96 hours of salt ast, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray.
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.
Corrosion Resistance Requirements Types. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. So if I’m interpreting this correct, there is both a color difference and a salt spray difference.
ASTM B633-98 std: Electrodeposited coating of Zinc
What type of zinc plating bath is awtm plater using? Ray Kremer Stellar Solutions, Inc. Can anyone give me some direction on how to get the customer to accept going to g633-98. Supplementary treatments shall be in accordance with Recommended Practice B It does not cover zinc-coated wire or sheets.
Does anybody know this info? Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish. A Iron or steel with zinc electroplate.
The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. Going with clear will make it difficult to tell what is clear chromated zinc vs. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. From beautiful Pine Beach New Jersey: A heavy chromate will shear under paint and cause the paint to peel.
ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. Any information would be well received. Yellow chromate should get 96 hrs to failure. Mark Hollenbeck alloys – Muskegon, Michigan A. This is not considered a decorative finish and will not generate matching parts. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
Numeral indicates thickness in micrometers. Is there any colour difference OR is there any Salt spray difference? III is colorless and not expected to hold up as long as the colored II. Put the chromate on light.
As the USA moved toward metric fasteners, for a while there was a move to dye them blue.
ASTM B std: Electrodeposited coating of Zinc
He passed away May 14, Rest in peace, Ken. No, other colors may not be available if my presumption is right. The end user must decide when a part fails, at b6633-98 rust” corrosion the chromate has failed or red rust both the chromate and the zinc are gone exposing the base metal.
Also, I found out that the casting is painted after plating.