ASTM B633-98 PDF
ASTM B Type II and III zinc chromate plating Q&A’s. *Note: Answer is based upon pre versions of B (, , ). The revision. Hi, can anyone advise if the ASTM std ASTM B [link by ed. to spec at TechStreet] std specification for Electroplated coatings on Iron and steel, the . ASTM Be1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel Scope This specification covers requirements .
|Published (Last):||13 July 2018|
|PDF File Size:||3.89 Mb|
|ePub File Size:||4.52 Mb|
|Price:||Free* [*Free Regsitration Required]|
Rest in peace, Ken.
He passed away May 14, Corrosion Resistance Requirements Types. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments.
Does plating make that big a difference knowing that it’s going to be painted also? Also, some yellow chromates are clear w.
I will be attending the ASTM B8 committee aztm in Philly later this week and will mention this letter to the sub-committee chair responsible for the B spec. II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting aztm hours of salt spray. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs. Hello Claudio and Ast, My compliments for an excellent round of questions!
So if I’m interpreting this correct, there is both a color difference and a salt spray difference.
How do you know if it is supposed to be Zinc Yellow or Zinc Clear? The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. Type II chromates are more commonly used where greater corrosion resistance is required, e. What do you say?
The Standard default is gold for type II coatings unless otherwise specified. SC 4 very severe. Zinc and Zinc alloys, such as zinc-nickel will surely play a more significant role as metals such as Cadmium are destined for the elements’ Valhalla.
ASTM B633-98 std: Electrodeposited coating of Zinc
All I need to know is what color the types are. III is colorless n633-98 not expected to hold up as long as the colored II. 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.
Regarding the question asked in letter ; Type II zinc plating vs. As the USA moved toward metric fasteners, for a while there was a move to dye them blue. Can anyone give me some direction on how to get the customer to b6339-8 going to clear.
Answer is based upon pre versions of B, A Iron or steel with zinc b633-998. This is not considered a decorative finish and will not generate matching parts.
Zinc Plating: ASTM B Type II vs. III
Thank you for your hard work which the finishing world continues to benefit from. III zinc plating B633-89 discussion started in but continuing through Q. It definitely implies Hex Chrome. Ray Kremer Stellar Solutions, Inc. Did you ever get the answers you were looking for? It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. A light yellow would be better than a clear. 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.
ASTM B-633 Type II vs. III zinc plating
I am not getting the difference axtm this. 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. Yellow chromate should get 96 hrs to failure.
From beautiful Pine Beach New Jersey: Put the chromate on light. Zinc plating is usually considered a functional coating, not a decorative one. No, other colors may not be available if my presumption is right.
Surfaces to be painted should 6b33-98 ONLY lightly chromated. That seems a bit discretional to me. According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how.