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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Don Penzenik – Elkhart, Indiana. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. Going with clear will make it difficult to tell what is b6339-8 chromated zinc vs. Answer is based upon pre versions of B, To calculate it is very difficult, as the plating is a few molecules thick.
Obviously, this must be clarified by the customer. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
Please forgive any resultant repetition or failures of chronological order. Until a b633-998 few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye. Put the chromate on light. Hello Claudio and Doug, My compliments for an excellent round of questions! Did you ever get the answers you were looking for? Could you explain this? I have the exact same questions.
August 31, A. This applies to all metals.
ASTM B – 98 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. It’s not possible to diagnose a finishing problem or b633-98 hazards of an operation via these pages. 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.
Hi, I recently received 2 batches of parts from two separate platers using this specification. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Kaushik, The “Types” define supplementary finishes to be done after the plating. It still will have Hex Chrome. How do you know if it is supposed to be Zinc Yellow or Zinc Clear?
Ken Vlach – Goleta, Aetm. Is there any colour difference OR is 6b33-98 any Salt spray difference? III zinc plating A discussion started in but continuing through Q.
Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. Not the least of which is the environmental regulations impact on the future of the selected finish.
The problem may not be with the chromate v633-98 all. Type II chromates are more commonly used where greater corrosion resistance is required, e.
It does not cover zinc-coated wire or sheets. So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Rest in peace, Ken. This is not considered a decorative finish and will not generate matching parts.
ASTM B633-98 std: Electrodeposited coating of Zinc
Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
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. Regarding the question asked in letter ; Type II zinc plating vs. Does plating make that big a difference knowing that it’s going asm be painted also? What type of zinc plating bath is your plater using? SC 4 very severe. No, other colors may not be available if my presumption is right.
Yellow chromate should get 96 hrs to failure. They share, however, the most basic of metal finishing requirements: Does anybody know this info?
Any information would be well received. It definitely implies Hex Chrome. Numeral indicates thickness in micrometers. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.
Thank you for your hard work which the finishing world continues to benefit from.