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 plated components vary from one industry to another. Rest in peace, Ken.
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. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. Ken Vlach – Goleta, California. astj
Could you explain this? Going with clear will make it difficult to tell what is clear chromated zinc vs. Thank you for your hard work which the finishing world continues to benefit from.
Regarding the question asked in letter ; Type II zinc plating vs. They share, however, the most basic of metal finishing requirements: The answer is Yes. This applies to all metals. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry. Hi, I recently received 2 batches of parts from two separate platers using this specification. All I need to know is what color the types are. What do you say? 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.
Is there any colour difference OR is there any Salt spray difference? Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Numeral indicates thickness in micrometers. What type of zinc plating bath is your plater using? Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs.
III is colorless and not expected to hold up astn long as the colored II. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. III zinc plating A discussion started in but continuing through Q.
ASTM B std: Electrodeposited coating of Zinc
But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Try using an acid zinc chloride bath and see if the casting covers. Is this process done in the United States, and if so by whom? The end user must decide when a part fails, at “white rust” corrosion the chromate has failed or red rust both the chromate and the zinc are gone exposing the base metal.
Also, I found out that the casting is painted after plating. B Where service conditions are valid only for coatings with chromate conversion coating.
ASTM B633-98 std: Electrodeposited coating of Zinc
Regards, Ted Mooney, P. A heavy chromate will shear under paint and cause the paint to peel. August 31, A. Please forgive any resultant repetition or failures of chronological order.
High strength steels tensile strength greater than MPa shall not be electroplated. 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.
Corrosion Resistance Requirements Types. SC 4 very severe. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
It b633–98 implies Hex Chrome.