Designation: B − Standard . chaser shall state ASTM B, the date of issue, service . Corrosion Resistance—Zinc coatings with Types II, III. ASTM B ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL. Type II, Zinc coating with colorful chromate passivation, 96 hours 48 hours. Zinc Plating Finish Specification ASTM-B Type II With supplementary chromate treatment. Type III With supplementary colorless chromate treatment.
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A heavy chromate will shear under paint and cause the paint to peel. The problem may not be with the chromate at all. They share, however, the most basic of metal finishing requirements: Hello Claudio and Doug, My compliments for an excellent round astm-b33 questions! Color will vary from light tan to black depending on alloy and thickness.
High strength steels tensile strength greater than M. Surfaces to be painted should be ONLY lightly chromated.
As much as the last layer ty;e the passivation is thin the electrical resistivity is low. Anodic-for high carbon martensitic steels. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably tyle dye. All I need to know is what color the types are.
Barrel Zinc – Finishes – Professional Plating Inc.
How do you know if it is supposed to be Zinc Yellow or Zinc Clear? Plates uniformly in recesses and cavities does not build up on edges. The Zinc coating provides a smooth look as well as good anti-corrosive protection. He passed away May 14, Our Zinc coating is carried out according to: The type of passivation is determined according to the required characteristics, and is divided into groups: At Professional Plating we are fully committed to meeting your needs for fine quality plating and prompt service.
To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. Not the least of which is the environmental regulations impact on the future of the selected finish.
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.
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 spec. The coating is made according to demand, where the axtm-b633 is as follows: What type of zinc plating bath is your plater using?
High strength steels tensile strength greater than MPa shall not be electroplated. Class 1A For maximum protection from corrosion, for surfaces to be painted or left unpainted. Has a low coefficient of thermal expansion-is magnetic.
Zinc coating with phosphate passivation. SC 4 very severe. Iron metals rust relative quickly, even in a non-corrosive environment. Iridescent and Colorless passivation is thin and has low electrical resistance.
I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive li. Barrel Zinc Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line. Corrosion resistance is good for coatings over. Go to main content.
Tin is not good for low temperature applications changes structure and loses adhesion when exposed to temperatures below degrees C. Zinc coating with colorful chromate passivation. Zinc coating with colorless RoHS compliance passivation. A Iron or astm-b6333 with zinc electroplate.
With phosphate conversion coatings. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.