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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Thickness can exceed that of fused tin and in deposit shows excellent corrosion resistance and solder ability. It definitely implies Hex Chrome.

Zinc Plating: ASTM B Type II vs. III

SC 2 moderate — Exposure to dry indoor atmospheres but subject to occasional condensation, wear, or abrasion. What specification can be better if I am interested to avoid corrosion? I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. Iridescent and Colorless passivation is thin and has ast-mb633 electrical resistance.

Numeral indicates thickness in micrometers. Zinc coating with colorful chromate passivation.

ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. Surfaces to be painted should be ONLY lightly chromated. Surfaces left-bare should be heavily chromated. Going with clear will make it difficult to tell what is clear chromated zinc vs.


All electroplated parts M. Corrosion resistance Colorful chromate passivation gives corrosion resistance ability of 96 hours according to ASTM B until white spots-intended to parts used in a high corrosive environment —outdoor. Where corrosion resistance is important.

III is colorless and not expected to hold up as long as the colored II. Zinc plated components vary from one industry to another. Our plater said that he would be willing to go thicker on the clear.

With colored chromate conversion coatings; Type III: Is there any colour difference OR is there any Salt spray difference? With this exceptional capacity we can provide rapid turnaround time. Strict compliance with our Statistical Process Control ensures the quality of every barrel plating project we do.

SC 4 very severe — Exposure to harsh conditions such as moisture, cleaners, saline solutions, and extreme wear. Color is gray white in plated condition. To prevent formation of case during.

Zinc Coating

What do you say? Did you ever get the answers you were looking for? Barrel Zinc Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line.

SC 3 severe – Exposure to condensation, perspiration, infrequent rain, and cleaners. II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. Plates uniformly in recesses and cavities does not build up on edges. Can be dyed practically any color or shade.


Our Zinc coating is carried out according to: Thus, hardness can range from Vickers. The type of passivation is determined according to the required characteristics, and is divided into groups: It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.

Corrosion resistance is good.

Barrel Zinc

To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. The rust not only harms the aesthetically smooth look, but also its mechanic needs.

For corrosion protection Grade A: Astm-h633 Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line.

Yellow chromate should thpe 96 hrs to failure.

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