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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The designer and engineer must take into account several considerations to stay at the forefront of the li potential. It does not cover zinc coated wire or sheets. Strict compliance with our Statistical Process Control ensures the quality of every barrel plating project we do.

This applies to all metals. Class 1A For maximum protection from corrosion, for surfaces to be painted or left unpainted. Surfaces left-bare should be heavily chromated.

Zinc Coating

Decorative charastreistics The exterior visual determined according to last layer. Olive Drab chromate is hrs. Tin is not good for low temperature applications changes structure and loses adhesion when exposed to temperatures below degrees C.

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.

Coating penetrates base metal as much as builds up on the surface. Color is gray white in plated condition. Obviously, this must be clarified by the customer. Zinc plating is usually considered a functional coating, not a decorative one. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.

  ISO 13335-3 PDF

Zinc Plating: ASTM B Type II vs. III

Where extreme abrasion resistance is required do not seal as some softening is encountered. Does plating make that big a difference knowing that it’s going to be painted also? Did you ever get the answers you were looking for? Can be used as an electrical insulation coating.

The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called passivation. Surfaces to be painted should be ONLY lightly chromated.

ASTM B-633 Type II vs. III zinc plating

The type of passivation is determined according to the required characteristics, and is divided into groups:. What do you say? High strength steels tensile strength greater than M.

All I need to know is what color the types are. The answer is Yes. Inspection difficulties may arise with clear coatings because visual inspection does not reveal the presence of a coating. Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.

Any information would be well received.

Barrel Zinc – Finishes – Professional Plating Inc.

For steels containing large amounts 0. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. 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 astm-h633.


What process variation would ast,-b633 these different results? From beautiful Pine Beach New Jersey: Zinc coating with colorful RoHS compliance passivation. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. Anodic-for high carbon martensitic astm-g633.

I am not getting the difference between this. Aluminum with low alloying elements will show practically no color change. Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line.

For corrosion protection Grade A: You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet.

Can anyone give me some direction on how to get the customer to accept going to ttpe.

Can be similar to stainless steel in color, or can be dull gray or light gray almost white color. No, other colors may not be available if my presumption is right. 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. Rest in peace, Ken.