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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Zinc and Zinc alloys, such as zinc-nickel will surely play a more significant role as metals such as Cadmium are destined for the elements’ Valhalla. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. To calculate it is very difficult, as the plating is a few molecules thick.
Numeral indicates thickness in micrometers. To determine the nature of accuracy or revision level please verify above data with current releases: Also, I found out that the casting is painted after plating.
Surfaces left-bare should be heavily chromated. So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Supplementary treatments shall be in accordance with Recommended Practice B Don Penzenik – Elkhart, Indiana. High strength steels tensile strength greater than MPa shall not be electroplated. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. III is colorless and not expected to hold up as asfm as the colored II.
We are getting poor coverage on the as-cast surface of some steel 6b33-98 using a yellow Aatm chromate. Put the chromate on light. SC 4 very severe. Ray Kremer Stellar Solutions, Inc. This applies to all metals. Kaushik, The “Types” define zstm finishes to be done after the plating. Did you ever get the answers you were looking for? The answer is Yes.
ASTM B633-98 std: Electrodeposited coating of Zinc
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. No, other colors may b633-98 be available if my presumption is right. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. It would be “bright, blue” — that is, shiny and metallic but astn a bluish rather than a yellowish cast. Regarding the question asked in letter ; Type II zinc plating vs.
That seems a asfm discretional to me. What process variation would produce these different results? 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 am not getting the difference between this.
ASTM B std: Electrodeposited coating of Zinc
Obviously, this must be clarified by the customer. The Standard default is gold for type II coatings unless otherwise specified. Type II chromates are more commonly used where greater corrosion resistance is required, e.
No it does not imply that.
As the USA moved toward metric fasteners, for a while there was a move to dye them blue. Answer is based upon pre versions of B, Our plater said that he would be willing to go thicker on the clear. He passed away May 14, Going with clear will make it difficult to tell what is clear chromated zinc vs. A light yellow would be better than a clear.
Also, some yellow chromates are clear w. Does anybody know this info? Olive Drab chromate is hrs. What type of zinc plating bath is your plater using? Hi, I recently received 2 batches of parts from two separate platers using this specification.
B Where service conditions are valid only for coatings with chromate conversion coating. A Iron or steel with zinc electroplate.