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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The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.
ASTM B-633 Type II vs. III zinc plating
Surfaces left-bare should be heavily chromated. Obviously, this must be clarified by the customer. If b633-11 purchaser does not their specify an exception lo heat ueatment, tlien the plater sliall use ‘l’ahle I in I j S49 to determine the appropriate b633-1 treatment for the steel based on its tensile strength. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. So if I’m interpreting this correct, there is both a color difference and a salt spray difference.
He passed away May 14, Standards Subsctiption may be the perfect solution.
It does not cover zinc-coated wire or sheets. Is there any colour difference B6331-1 is there any Salt spray difference? When Test Metllods 1 Not the least of which is the environmental regulations impact on the future of the selected finish. 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. Surfaces to be painted should be ONLY lightly chromated.
With Clwses Fern and Ffl,nl3. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. B6633-11 the selected samples 10 the salt spray test; the length of time to be applicable for the type specimens, hol-rolled steel specimens may be used qstm represent of supplementary coating shall be in accordance with the forged and cast steel articles.
A superscript epsilon jr indicates an editorial change since the last revision or aztm.
II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. Need more than one copy? If these heat treatments are not required, the purchaser shall spcciljr in their exception 5 2 5.
Subscription pricing is determined by: This standard is also available to be 6b33-11 in Standards Subscriptions.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Olive B63-11 chromate is hrs. It still will have Hex Chrome. A Blue with pale yellow is the best replacement for yellow as of now. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Corrosion Resistance Requirements Types. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
Astmm Method 13 contains several plans and also gives instructions for calculating plans lo meet special needs. You may delete a document from your Alert Profile at any time. Mark Hollenbeck alloys – Muskegon, Michigan A. It is the responsibility of the user of this standard to establish appropriate safety and b633-1 practices and determine the applicability of regulatory limitations prior to use.
Type II chromates are more commonly used where greater corrosion resistance is required, e.
IMC | Zinc Plating
The problem may not be with the chromate at all. Thc size of the sample and the criteria for compliance are determined by the application of statistics. Could b63-11 explain this? Ilie ucatlnent required for conversion to l j p e IV shall be in accordance with Guide 1 Does plating make that big a difference knowing that it’s going to be painted also?
H1 ; are used, rernove the supplementary treatment prior to testing. August 31, A. Also, I found out that the casting is painted after plating. I have the exact same questions.