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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Barrel Zinc

I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. What process variation would produce these different results? Has a astmm-b633 coefficient of thermal expansion-is magnetic.

Did you ever get the answers you were looking for? This applies to all metals. A light yellow would be better than a clear. Our barrel, station line enables us to process thousands of pounds of material every day. Could you explain this? 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 type of passivation is determined according to the required characteristics, and is divided into groups:. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations. Corrosion resistance is a function of thickness. Where extreme abrasion resistance is required do not seal as some softening is encountered.

Barrel Zinc – Finishes – Professional Plating Inc.

For urgent projects, we can turn the work around even faster with no loss of quality. He passed away May 14, SC 3 severe – Exposure to condensation, perspiration, infrequent rain, and cleaners.


So if you need to color match, you need to do it typd a requirement for compliance with sample parts — not a verbal description. Solder ability is excellent. The Zinc coating provides a smooth look as well as good anti-corrosive protection.

I am not getting the difference between this. Any information would be well received. Our Barrel Plating line is fully automated and digitally controlled with special programs, and individual recipes to manage cleaning, plating, and chromating operations. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.

No it typd not imply that. Iron metals rust relative quickly, even in a non-corrosive environment. Thickness Classes for Coatings: Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.

Provides very hard ceramic type coating. Zinc ASTM-B This specification covers ast-mb633 for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion. Tin is not good for low temperature applications changes structure and loses adhesion when exposed to temperatures below degrees C.

Surfaces left-bare should be heavily chromated.

A Iron or steel with zinc electroplate. With colored chromate conversion coatings. Thickness can exceed that of fused tin and in deposit shows excellent corrosion ast-mb633 and solder ability.

Zinc plating is usually considered a functional coating, astm-b33 a decorative one. Zinc coating with colorful RoHS compliance passivation. To calculate it is very difficult, as the plating is a few molecules thick. Type II chromates are more commonly used where greater corrosion resistance is required, e. As specified on drawing. Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low. Until a very few years ago chromate conversion coatings aastm-b633 based on hexavalent chromium, and deposited a thick film that was relatively easy to dye.


Class 1A chemical conversion coatings are intended to provide corrosion prevention when left astm-b33 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. Kaushik, The “Types” define supplementary finishes to be done after the plating.

Registered to ISO Class 1A For maximum protection from corrosion, for surfaces to be painted or left unpainted.

Zinc Plating: ASTM B Type II vs. III

Regards, Ted Mooney, P. Supplementary treatments shall be in accordance with Recommended Practice B Zinc coating with phosphate passivation.

It definitely implies Hex Chrome. Ken Vlach – Goleta, California. It does not cover zinc coated wire or sheets. Ray Kremer Stellar Solutions, Inc.

ASTM B-633 Type II vs. III zinc plating

High strength steels tensile strength greater than M. According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand astm-6b33 the layer is removable let’s see how. Can anyone give me some direction on how to get the customer to accept going to clear. Colorful chromate passivation gives corrosion resistance ability of tgpe hours according to ASTM B until white spots-intended to parts used in a high corrosive environment —outdoor.