He is asking for more info on the difference between ASTM B [link by ed. to spec at TechStreet] type II and type III. Can anyone give me some direction on. ASTM B Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. This specification covers requirements for electrodeposited. ASTM B Thickness classes for coatings: KEY: Classification #, Service condition, Thickness Fe/Zn 25, SC4 (very severe), 25um or ″ Fe/Zn 12, SC3.
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Add to Alert PDF. Does anybody know this info?
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Olive Drab chromate is hrs. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though. Test Method 13 contains several plans and also gives instructions for calculating plans lo meet special needs. I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. The test must yield a numeric value and ccrtain statistical requirements must be met.
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.
Put the chromate on light. Corrosion Resistance Requirements Types. The procedure is known as sampling inspection. No it does not imply that. Any information would be well received. That seems a bit discretional to me. Except as otherwise spaififii in the contract or order, the supplier may use his own or any other facilities suitable for thc performance of the inspection requirements specified herein, unless disapproved by the purchaser.
Surfaces to be painted should be ONLY lightly chromated. A light yellow would be better than a clear.
ASTM B-633 Type II vs. III zinc plating
This is not considered a decorative finish zstm will not generate matching parts. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Tesl Method 13 provides a default plan if one is no1 specified. Ken Vlach – Goleta, California.
It definitely implies Hex Chrome. You may delete a document from your Alert Profile at any time.
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The appearance of asfm products when examined with eyesight at normal reading distance shall be cause for rejection, except that white corrosion products 6 mm or less from the edges of specimens shall not constitute failure. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
Asm still will have Hex Chrome. You can download and open this file to your own computer but DRM prevents opening this file wstm another computer, including a networked server.
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Is there any colour difference OR is there any Salt spray difference? I’ve seen this done less commonly on chromated zinc plating than on chromated b33-11. I have the exact same questions. 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.