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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So if aatm need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description. The Standard default is gold for type II coatings unless otherwise specified. B Where service conditions are valid only for coatings with chromate conversion coating. Any information would be well received. Until a very few years ago chromate conversion coatings were based on b633-998 chromium, and deposited a thick film that was relatively easy to dye.
ASTM B-633 Type II vs. III zinc plating
Type II chromates are more commonly used where greater corrosion resistance is required, e. The above entries are somewhat dated: It definitely implies Hex Chrome. We are getting poor coverage on the as-cast surface of some steel b633-998 using a yellow Zinc chromate. 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.
High strength steels tensile strength greater than MPa shall not be electroplated. Also, I found out that the casting wstm painted after plating. I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. It does not cover zinc-coated wire or sheets. ASTM B and all other worldwide standards were written satm the time when no one spoke about trivalent.
Mark Hollenbeck alloys – Muskegon, Michigan A. Thank you for your hard work which the finishing world continues to benefit from. This applies to all metals.
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. August 31, A.
ASTM B – 98 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
A Blue with pale yellow is the best replacement for yellow as of now. Regarding the question asked in letter ; Type II zinc plating vs. III is colorless and not expected to hold up as long as the colored II.
Supplementary treatments shall be in accordance with Recommended Practice B I will be attending the ASTM B8 committee meetings in Philly v633-98 this week and will mention this letter to the sub-committee chair responsible for the B spec. Zinc plated components vary from one industry to another.
Olive Drab chromate is hrs. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Zinc and Zinc alloys, such as zinc-nickel will surely play a adtm significant role as metals such as Cadmium are destined for the elements’ Valhalla. Obviously, this must be clarified by the customer. adtm
Ray Kremer Stellar Solutions, Inc. Can anyone give me some direction on how to get the customer to accept going to clear. Not the least of which is the environmental regulations impact on the future of the selected finish.
Hello Claudio and Doug, My compliments for an excellent round of questions! The designer and engineer must take b633-8 account several considerations to stay at the forefront of the finish potential. 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.
All information presented is for general reference and does b633-9 represent a professional opinion nor the policy of an author’s b33-98.