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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You may delete a document from your Alert Profile at any time. Test Method 13 contains several plans and also gives instructions for calculating plans lo meet special needs. Standards Subsctiption may be the perfect solution. This standard is not included in any packages.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
What do you say? ASTM htemational takes no positron respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. The Standard default is gold for type II coatings unless otherwise specified. Your Alert Profile lists the documents that will be monitored. It is recommended that the following. Type II chromates are more commonly used where greater corrosion resistance is required, e.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. 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.
Does plating make that big a difference knowing that it’s going to be painted also? Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish. While thc conditions of exposure and uses of electroplated metal are so varied that it is not definitely possible to predict the exact life of articles protected by a coating of a given thickness, those usirig ziric coatings can draw on the wealth of practical experience at hand, supplemented by results of corrosion tests carried out over the years.
Subject 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 lo represent of supplementary coating shall be in accordance with the forged and cast steel articles.
A Blue with pale yellow is the best replacement for yellow as of now. Test Method 13Guide Band Test Method 13 contain sampling plans that are designed for sampling inspection of coatings.
Raked park shall not crack or fail by fracture when tested in accord;mce with A light yellow would be better than a clear. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor serviceBastm.
Fnr thesc reasons a flat test panel should be usai to evaluate the prwess capability and the angle should be controlled to cnsure consistent Ille: All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. 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.
Zinc Plating: ASTM B Type II vs. III
We have no amendments or corrections for this standard. Please forgive any resultant repetition or failures of chronological order.
I’ve seen this done less commonly on xstm zinc plating than on chromated v633-11. Also, some yellow chromates are clear w. Supplementary treatments shall be in accordance with Recommended Practice B This is not considered a decorative finish and will not generate matching parts.
Ciuidc 13 provides a default plan if one is not specified. Is this process done in the United States, and if so by whom?
ASTM B-633 Type II vs. III zinc plating
Packaging and Packing If the document is revised or amended, you will be notified by email. Additional types have been added to permit non-chromate passivate treatments to be used in replacement of hexavalent chromium. So if I’m interpreting this correct, there is both a color difference and a salt spray difference.
This applies to all metals. Thank you for your hard work which the finishing world continues to benefit from. Electroplated springs and other puts subject to flexure sliall not be Ilcxed before the hydrogen embrittlement relief treatment.