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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Zinc coating with colorless RoHS compliance passivation. Class 1A For maximum protection from corrosion, for surfaces to be painted or left unpainted.
I am not getting the difference between this. Barrel Zinc Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line. For steels containing large amounts 0.
ASTM B-633 Type II vs. III zinc plating
Could you explain this? Color will vary from light tan to black depending on alloy and thickness. Regards, Ted Mooney, P.
This applies to all metals. August 31, A.
Yellow chromate should get 96 hrs to failure. Type II chromates are more commonly used where greater corrosion resistance is required, e. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
The type of passivation is determined according to the required characteristics, and is divided into groups:.
Aluminum with low alloying elements will show practically no color change. 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. Has a low coefficient of thermal expansion-is magnetic.
Try using an acid zinc chloride bath and see if the casting covers. Soft, but is very ductile. Inspection difficulties may arise with clear coatings because visual inspection does not reveal the presence of a coating.
Zinc Plating: ASTM B Type II vs. III
II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. Can be dyed practically any color or shade.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
As specified on drawing. Zinc plating is usually considered a functional coating, not a decorative one. Numeral indicates thickness in micrometers. With phosphate conversion coatings. Yellow-iridescent Black Olive Green.
Also, some yellow chromates are clear w. Zinc coating with colorful RoHS compliance passivation. Available colors are iridescent and black Colorless chromate passivation gives corrosion resistance ability of 12 hours according to ASTM B until white spots-intended to parts used in a light corrosive environment —indoor. Specification covers standard recommendation practice for cleaning and de-scaling stainless steel parts, equipment and systems.
Registered to ISO No it does not imply that.
Our Barrel Plating line is fully automated and digitally controlled with special programs, and individual recipes to manage cleaning, plating, and chromating operations. 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.
Where extreme abrasion resistance is required do not seal as some softening is encountered. With colored chromate conversion coatings. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Answer is based upon pre versions of B, Surfaces left-bare should be heavily chromated. At Professional Plating we are fully committed to meeting your needs for fine quality plating and prompt service.