Zinc [ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel Types, Test Period (Hours.) II, III, Designation: B − Standard . chaser shall state ASTM B, the date of issue, service . Corrosion Resistance—Zinc coatings with Types II, III. Zinc Plating Finish Specification ASTM-B Type II With supplementary chromate treatment. Type III With supplementary colorless chromate treatment.
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Rype to ISO Color is gray white in plated condition. Where maximum serviceability or special properties are required, consult metal finisher for best alloy choice. Has a low coefficient of thermal expansion-is magnetic. It’s tyep possible to diagnose a finishing problem or the hazards of an operation via these pages. As much as the last layer of the passivation is thin the electrical resistivity is low.
I need to specify platings that do not contain Hexavalent Chromium for parts that will be qstm-b633 in the automotive industry. All I need to know is what color the types are.
The type of passivation is determined according to the required characteristics, and is divided into groups: Ken Vlach – Goleta, California. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.
Zinc Plating: ASTM B Type II vs. III
The coating is made according to demand, where the distribution is as follows: All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Type II chromates are more commonly used where greater corrosion resistance is astmb-633, e. Our plater would like to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life.
So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description. Answer is based upon pre versions of B, SC 4 very severe — Exposure to harsh conditions such as moisture, cleaners, saline solutions, and extreme wear. Can anyone give me some direction on how to get the customer ui accept going to clear.
Had very high luster in fused condition. A heavy chromate will shear under paint and cause the paint to peel. A Iron or steel with zinc electroplate. Not the least of which is the environmental regulations impact on the future of the selected finish.
ASTM B-633 Type II vs. III zinc plating
Olive green passivation is a chromate passivation in a green hue that gives excellent corrosion resistance ability hours in a salt spray test and is a good base for paint. Soft, but is very tyoe. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. Minimum weight Type II coatings.
Can be dyed in darker colors depending on thickness. Zinc plating is usually considered a functional coating, not a decorative one.
Electroless Nickel is used extensively in salvage of miss-machined parts. Class 1A chemical conversion coatings are intended to provide corrosion prevention when left unpainted and to improve adhesion of paint finish systems to aluminum and aluminum alloys may be used for all surface treatments of tanks, tubing’s and component structures where interior paint finishes are not required.
Barrel Zinc – Finishes – Professional Plating Inc.
The above entries are somewhat dated: Where ii abrasion resistance is required do not seal as some softening is encountered. Could you explain this? As the USA moved toward metric fasteners, for a while there was a move to dye them blue. August 31, A.
Thickness Classes for Astm-b6333 III is colorless and not expected to hold up as long as the colored II. Coating penetrates base metal as much as builds up on the surface.
Don Penzenik – Elkhart, Indiana. Inspection difficulties may arise with clear coatings because visual axtm-b633 does not reveal the presence of a coating. Materials qualified produce coatings astm-633 range in color from clear to iridescent yellow or brown. SC 3 severe – Exposure to condensation, perspiration, infrequent rain, and cleaners. What specification can be better if I am interested to avoid corrosion?
B Where service conditions are valid only for coatings with chromate conversion coating.