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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Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. Inspection difficulties may arise with clear coatings because visual inspection does not reveal the presence of a coating.

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

Zinc Plating: ASTM B Type II vs. III

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. Repair of mechanically damaged areas of anodic coatings conforming to MIL-A will provide effective means of reestablishing corrosion resistance but will not restore abrasion resistance of the anodic coating.

Class 3 Class 3 chemical coatings are intended as a corrosion preventive film from electrical and electronic applications where low resistance contacts are required. Plates uniformly in recesses and cavities does not build up on edges. Corrosion resistance is good for coatings over.


Electroless Nickel is used extensively in salvage of miss-machined parts.

Also for qstm-b633 dimensions and irregular shapes where assembly tolerances need uniformity provided by Electroless process. Color will vary from light tan to black depending on alloy and thickness. Can be dyed in darker colors depending on thickness. Coating penetrates base metal as much as builds up on the surface.

Provides very hard ceramic type coating. Where extreme abrasion resistance is required do not seal as some softening is encountered. As specified on drawing. Most io alloys depending on process used. Where maximum serviceability or special properties are required, consult metal finisher for best alloy choice. Can be used as an electrical insulation coating.

Barrel Zinc – Finishes – Professional Plating Inc.

There is a nickel finish for almost any need. Nickel can be deposited soft or hard-dull or bright, depending on process used and conditions employed in plating. Thus, hardness can range from Vickers. Can be similar to stainless steel in color, or can be dull gray or light gray almost white color.

Corrosion resistance is a function of thickness. Has a low coefficient of thermal expansion-is magnetic. Specification covers standard recommendation practice for cleaning and de-scaling stainless steel parts, equipment and systems.

Cleaning includes all operations necessary for the removal of surface contaminants from metals to astm-b633 For steels containing large amounts 0. Anodic-for high carbon martensitic steels.

ASTM B-633 Type II vs. III zinc plating

Color will vary with alloy. Aluminum with low alloying elements will show practically no color change. Best coating on aluminum for dyeing. Can be dyed practically any color or shade.


Minimum weight Type II coatings. Color is gray white in plated condition. Had very high luster in fused condition. Soft, but is very ductile.

Corrosion resistance is good. Solder ability is excellent. Tin is not good for low temperature applications changes structure and loses adhesion when exposed to temperatures wstm-b633 degrees C.

If a bright finish is desired to be used in lieu of fused tin, specify Bright Tin plate. Qstm-b633 can exceed that of fused tin and in deposit shows excellent corrosion resistance and solder ability. Where corrosion resistance is important. To prevent formation of case during. Zinc ASTM-B This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion.

It does asm-b633 cover zinc coated wire or sheets.

High strength steels tensile strength greater than M. All parts with ultimate tensile strength M.

All electroplated parts M. With colored chromate conversion coatings. With phosphate conversion coatings. Thickness Classes for Coatings: For corrosion protection Grade A: With colored chromate conversion coatings; Type III:

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