Zulkigrel It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. If heavier coatings are required, allowance b the deposit buildup must be made during the manufacture of the threaded articles. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. They may be reconsidered for inspection in accordance with Test Method B As a result of large-scale and long-range tests conducted by ASTM and other organizations, there is excellent information on the corrosion behavior of zinc and zinc coatings. You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet.
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Garn This standard is not included asfm any packages. Asm htemational takes no positron respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For example, a cold-rolled steel Section 11, Robhills Avc. You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet.
It is recommended that the following. Type II chromates are more commonly used where greater corrosion resistance is required, e.
Please first log in with a verified email before subscribing to alerts. The answer is Yes. If the document is revised or amended, you will be notified by email. Surfaces left-bare should be heavily chromated. Please first verify your email before subscribing to alerts. Different brands of chromate conversion chemistry, possibly different atm processes acid zinc vs. Current edition approved Jan. The values are only relative, since individual studies in various parts of the world have ast, in figures which vary widely from these averages.
I am not getting the difference between this. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. As a result of large-scale and long-range tests conducted by ASTM and b organizations, tllere is excellent information on the corrosion behavior of zinc arid zinc coatings. Don Penzenik — Elkhart, Indiana. Our plater said that he would be willing to go thicker on the clear.
We have no amendments or corrections for this standard. That seems a bit discretional to me. A superscript epsilon jr indicates an editorial change since the last revision or reapproval. Regarding the question asked in letter ; Type II zinc plating vs. The above entries are somewhat dated: Yellow chromate sstm get 96 hrs to failure. What do you say? As the voice of the U. It does not cover b wire or sheets. Any information would be well received.
Your Alert Profile lists the documents that will be monitored. So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description.
H is colorless and not expected to hold up as long as the colored II. ASTM B — Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel The appearance of corrosion products when examined with eyesight at normal reading distance shall be cause for rejection, except that white corrosion products 6 mm or less from the edges of specimens shall not constitute failure.
A light yellow would be better than a clear. Raked park shall not crack or fail by fracture when tested in accord;mce with Also, I found out that the casting is painted after plating. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor serviceBastm. Also, some yellow chromates are clear w. The sampling plan used for the inspection of the qualily coated article shall be agreed upon betweet1 the purchaser and producer.
Materials and Manufacture 6. Answer is based upon pre versions of B, August 31, A. TOP Related Articles.
ASTM B633-85 PDF
Kazahn Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low. Originally approved in It is recommended that the following appropriate recommended practices and guides be used: The Zinc coating provides a smooth look as well as good anti-corrosive protection. III is colorless and not expected to hold up as long as the 6b33 II. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations. III zinc plating A discussion started in but continuing h Q. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in frre automotive industry.
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What do you say? SC 4 very severe. Hi, I recently received 2 batches of parts from two asmt platers using this specification. Zinc plated components vary from one industry to another. No it does not imply that. August 31, A. A Blue with pale yellow is the best replacement for yellow as of now.
More B Electrodeposited zinc-coated steel wires or sheets are not covered here. The coatings shall be provided in four standard thickness classes in the as-plated condition or with one of three types of supplementary finishes. The surfaces of the articles shall under go pre-plating basis metal cleaning, pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and reactivation and supplementary treatments.
ASTM B633 FREE PDF
Migul If the purchaser does not specify an exception to heat treatment, then the plater shall use Table 1 in B to determine the appropriate heat treatment for the steel based on its tensile strength. Don Penzenik — Elkhart, Indiana. No, other colors may not be available if my presumption is right. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. Materials and Manufacture 6. As much as the last layer of the passivation is thin the electrical resistivity is low.