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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Could you explain this? So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Rest in peace, Ken. All I need to know is what color the types are.
The part is currently being produced in China aztm my local platers are suggesting a dye to get a blue color. How do you know if it is supposed to be Zinc Yellow or Zinc Clear?
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. What type of zinc plating bath is your plater using? Did you ever get the answers you were looking for? Is there any colour difference OR is there any Salt spray difference?
ASTM B633-98 std: Electrodeposited coating of Zinc
Does anybody know this info? This applies to all metals. Mark Hollenbeck alloys – Muskegon, Michigan A. The Standard default is gold for type II coatings unless otherwise specified. No, other colors may not be available if my presumption is right. Olive Drab chromate is hrs.
So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description. No it aztm not imply that. B Where service conditions are valid only for coatings with chromate conversion coating.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Obviously, this must be clarified by the customer. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. I have the exact same questions.
ASTM B std: Electrodeposited coating of Zinc
Try using an acid zinc chloride bath and see if the casting covers. Supplementary treatments shall be in accordance with Recommended Practice B The end user must decide when a part fails, at “white rust” corrosion the b633-98 has failed or red rust both the chromate and the zinc are gone exposing the base metal.
ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. A heavy chromate will shear under paint and cause the paint to peel.
Hi, I recently received 2 batches of parts from two separate platers using this specification. What do you say?
Zinc plated components vary from one industry to another. Axtm with clear will make it difficult to tell what is clear chromated zinc vs. Please forgive any resultant repetition or failures of chronological order.
ASTM B-633 Type II vs. III zinc plating
What process variation would produce these different results? Ray Kremer Stellar Solutions, Inc. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Bb633-98 Resistance Requirements Types. Ken Vlach – Goleta, California.
High strength steels tensile strength greater than MPa shall not be electroplated.