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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Is there any colour difference OR is there any Salt spray difference? You may delete a document from your Alert Profile at any time.
As the voice of the U. Thc size of the sample and the criteria for compliance are determined by the application of statistics. Going with clear will make it difficult to tell what is clear chromated zinc vs. Numeral indicates thickness in micrometers. When Test Metllods 1 Does plating make that big a difference knowing that it’s going to be painted also? A Blue with pale yellow is the best replacement for yellow as of now. 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 b633–11.
Packaging and Packing Already Subscribed to this document. Is this process done in aatm United States, and if so by whom? Supplementary treatments shall be in accordance with Recommended Practice B Electroplated springs and other puts subject to flexure sliall not be Ilcxed before the hydrogen embrittlement relief treatment. So if Bb633-11 interpreting this correct, there is both a color difference and a salt spray difference.
ASTM B-633 Type II vs. III zinc plating
This is not considered a decorative finish and will not generate matching parts. Chiginally approved in Hello Claudio and Doug, My compliments for an excellent round of questions! SC 4 very severe. Also, some yellow chromates are clear w. Regarding the question asked in letter ; Type II zinc plating vs. Condilions affecting the electroplating of specimens, including N n. Our plater said that he would be willing to go thicker on the clear.
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.
The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential. For corrosion resistance requirements, see ‘l;il lt: With Clwses Fern and Ffl,nl3. The salt spray test operations, prelimirlary to electroplaling, and shall not be shall commence within 72 11 of the completion of the aging separated therefrom until after completion of electroplating.
IMC | Zinc Plating
Surfaces left-bare should be heavily chromated. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
Could you explain this? Ray Kremer Stellar Solutions, Inc. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.
III is colorless and not expected to hold up as long as the colored II. Subscription pricing is determined by: The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.
Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. The test must yield a numeric value and ccrtain statistical requirements must be met. This standard is not included in any packages. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.
Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.
This standard is also available to be included in Standards Subscriptions. Responsibility for Inspection S1. No, other colors may not be available if my presumption is right. Not the least of which is the environmental regulations impact on the future of the selected finish. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. We have no amendments or corrections for this standard.