ASTM B633-11 PDF
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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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. Already Subscribed to this document. Answer awtm based upon pre versions of B, It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. Please forgive any resultant repetition or failures of chronological order. It does not cover zinc-coated wire or sheets.
With Clwses Fern and Ffl,nl3.
Zinc and Zinc alloys, such as zinc-nickel will surely play a more significant role as metals such as Cadmium asttm destined for the elements’ Valhalla. Condilions affecting the electroplating of specimens, including N n. Your comments are invited either for revislon of this standard or for additional standards and should be addressed to ASTM International Headquarters.
A light yellow would be better than a clear. Rest in peace, Ken. Thank you for your hard work which the finishing world continues to benefit from.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Is there any asttm difference OR is there any Aztm spray difference? When Test Metllods 1 A Blue with pale yellow is the best replacement for sstm as of now. Type II chromates are more commonly used where greater corrosion resistance is required, e. Does plating make that big a difference knowing that it’s going to be painted also?
The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential. As the voice of the U. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate.
This is not considered a decorative finish and will not generate matching parts. It is recommended that the following. 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.
Need b633-1 than one copy? Until a very few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye.
ASTM B-633 Type II vs. III zinc plating
To determine the nature of accuracy or revision level please verify above data with current releases: SC 4 very severe. Zinc wstm components vary from one industry to another. The end user must decide when a part fails, at “white rust” corrosion the chromate has failed or red rust both the chromate and n633-11 zinc are gone exposing the base metal.
If the document is revised or amended, you will be notified by email. Also, some yellow chromates are clear w. Responsibility for Inspection S1. I am not getting the difference between this. The answer is Yes. August 31, A. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs.
Electroplated springs and other puts subject to flexure sliall not be Ilcxed before the hydrogen embrittlement relief treatment.
Going with clear will make it difficult to tell what is clear chromated zinc vs.
III is colorless and not expected to hold up as long as the colored II. That seems a bit discretional to me. As the USA moved toward metric fasteners, for a while there was a move to dye them blue.
The sampling plan used for the inspection of the qualily coated article shall be agreed upon betweet1 the purchaser ast, producer. A heavy chromate will shear under paint and cause the paint to peel.
ASTM B – 11 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
You may delete a document from your Alert Profile at any time. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. What do you say?