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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ASTM B633-98 std: Electrodeposited coating of Zinc
Ray Kremer Stellar Solutions, Inc. What type of zinc plating bath is your plater using? It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. Hello Claudio and Doug, My compliments b6333-98 an excellent round of questions!
Please forgive any resultant repetition aztm failures of chronological order. Ken Vlach – Goleta, California. Is there any colour difference OR is there any Salt spray difference? Try using an acid zinc chloride bath and see if the casting covers. Mark Hollenbeck alloys – Muskegon, Michigan A.
Could you explain this? Zinc plating is usually considered a functional coating, not a decorative one. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.
ASTM B std: Electrodeposited coating of Zinc
Regards, Ted Mooney, P. This is not considered a decorative finish and will not generate matching parts. Obviously, this must be clarified by the customer. The above entries are somewhat dated: So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Corrosion Resistance Requirements Types.
Hi, I recently received 2 batches of parts from two separate platers using this specification. It does not cover zinc-coated wire or sheets. So if you need xstm color match, you need to do it with a requirement for compliance with sample parts asgm not a verbal description. 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.
I have the exact same questions.
ASTM B-633 Type II vs. III zinc plating
Our plater said that he would be willing to go thicker on the clear. I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. I will be attending the ASTM B8 committee meetings in Philly later this week and will mention this asttm to astn sub-committee chair responsible for the B spec.
Is this process done in the United States, and if so by whom? Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish. SC 4 very severe.
Zinc Plating: ASTM B Type II vs. III
The problem may not be with the chromate at all. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Yellow b33-98 should get 96 hrs to failure. Thank you for your hard work which the finishing world continues to benefit from. To calculate it is very difficult, as the plating is a few molecules thick.
To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Did you ever get the answers you were looking for? From beautiful Pine Beach New Jersey: To minimize astj searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing.
All information presented is for general reference and does not represent a v633-98 opinion nor the policy of an author’s employer.
II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray.