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
Does plating make that big a difference knowing that it’s going to be painted also? Try using an acid zinc chloride bath and see if the casting covers.
To calculate it is very difficult, as the plating is a few molecules thick. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. SC 4 very severe. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Did you ever get the answers you were looking for? I will be attending the ASTM B8 committee meetings in Philly later this week and will mention this letter to the sub-committee chair responsible for the B spec.
The answer is Yes. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. The problem may not be with the chromate at all. This is not considered a decorative finish and will not generate matching parts.
Ray Kremer Stellar Solutions, Inc.
What process variation would produce these different results? Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. High strength steels tensile strength greater than MPa shall not be electroplated. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. Also, I found out that the casting is painted after plating. It still will have Hex Chrome. The above entries are somewhat dated: Surfaces to be painted should be ONLY lightly chromated.
Type II chromates are more commonly used where greater corrosion resistance is required, e. That seems a bit discretional to me.
Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. What type of zinc plating bath is your plater using? I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
No adtm does not imply that. From beautiful Pine Beach New Jersey: To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Rest in peace, Ken. A heavy chromate will shear under paint astn cause the paint to peel.
Numeral indicates thickness in micrometers. A Iron or steel with zinc electroplate. Is there any colour difference OR is there any Wstm spray difference? Xstm some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Hello Claudio and Doug, My compliments for an excellent round of questions!
Zinc Plating: ASTM B Type II vs. III
Our plater would like to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life. No, other colors may not be available if my presumption is right. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. I am not getting the difference b6633-98 this. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
To determine the nature of accuracy or revision level please verify above data with current releases: Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
Regards, Ted Mooney, P. A light yellow would be better than a clear. Our plater said that he would be willing to go thicker on the clear.