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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They share, however, the most basic of metal finishing requirements: The baking treatment shall be done before tlie application of the supplementary treatments and within 4 h of removal from the last process. Sorry, but if you need one b633-1 look, you must go through the ugly process of maintaining sample boards with acceptable vs. To calculate it is very difficult, as the plating is a few molecules thick. Please first verify your email before subscribing to alerts.
High strength steels tensile strength greater than MPa shall not be electroplated. Mark Hollenbeck alloys – Muskegon, Michigan A. The Standard default is gold for type II coatings unless otherwise specified.
Additional types have been added to permit non-chromate passivate treatments to be used in replacement of hexavalent chromium. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.
Ken Vlach – Goleta, California. We have no amendments or corrections for this standard. You may delete a document from your Alert Profile at any time. No, other colors may not be available if atm presumption is right. Our plater said that he would be willing to go thicker on the clear. Add to Alert PDF.
Wstm 13 provides a default plan if one is not specified. Also, some yellow chromates are clear w.
Rcfcrcnccd 1 ocuments 2. Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths.
Standards Subsctiption may be the perfect solution. Rejection approximately 1 mm thick. Section 11, Robhills Avc. Test Method 13 contains several plans and also gives instructions for calculating plans lo meet special needs. August 31, A.
ASTM B – 11 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Condilions affecting the electroplating of specimens, including N n. A light yellow would be better than a clear.
Surfaces to be painted should be ONLY lightly chromated. III is colorless and not expected to hold up as long as the colored II. Individual reprints single or multiple copies of this asrm may be obtained by contacting ASTM at the above address or at phonefaxor serviceBastm. Materials and Manufacture 6. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.
SC 4 very severe. A nunlher in parentheses indicates the ycar uf liut reapproval.
This applies to all metals. 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. Zinc plating is usually considered a functional coating, b633–11 a decorative one. What type of zinc plating bath is your plater using? The designer and engineer must take into account several considerations to stay at the forefront of the finish potential.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
ASTM B-633 Type II vs. III zinc plating
Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. With Clwses Fern and Ffl,nl3. The answer is Yes.
Also, I found out that the casting is painted after plating. Don Penzenik – Elkhart, Indiana. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.