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 above entries are somewhat dated: All I need to know is what color the types are. There are different passivation colors: A light aatm-b633 would be better than a clear.

Aluminum with low alloying elements will show practically no color change. Where corrosion resistance is important.

Barrel Zinc – Finishes – Professional Plating Inc.

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.

If a bright finish is desired to be used in lieu typs fused tin, specify Bright Tin plate. Answer is based upon pre versions of B, So if I’m interpreting this correct, there is both a color difference and a salt spray difference. Tin is not good for low temperature applications changes structure and loses adhesion when exposed to temperatures below degrees C. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments.

Zinc Plating: ASTM B Type II vs. III

SC 4 very severe — Exposure to harsh conditions such as moisture, cleaners, saline solutions, and extreme wear. Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III.


According to RoHS the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how. Hello Claudio and Doug, My compliments for an excellent round of questions! Nickel can be deposited soft or hard-dull or bright, depending on process used and conditions employed in plating.

With this exceptional capacity we can provide rapid turnaround time. The rust not only harms the aesthetically smooth look, but also its mechanic needs.

To calculate it is very difficult, as the plating is a few molecules thick. Smaller parts, including fasteners, hardware, and metal stampings can be efficiently and economically handled in Professional Plating’s Barrel Zinc Plating line.

Barrel Zinc

The coating is made according to demand, where the distribution is as follows: Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish. Soft, but is very ductile. Minimum weight Type II coatings. Ken Vlach – Goleta, California. What type of zinc plating bath is your plater using? Ray Kremer Stellar Solutions, Inc. Our Barrel Plating line is fully automated and digitally controlled with special programs, and individual recipes to manage cleaning, plating, and chromating operations.

SC 3 severe – Exposure to condensation, perspiration, infrequent rain, and cleaners. They share, however, the most basic of metal finishing requirements: Materials qualified produce coatings that range in color from clear to iridescent yellow or brown.

Zinc coating with colorful chromate passivation. Does plating make that big a difference knowing that it’s going to be painted also? At Professional Plating we are fully committed to meeting your needs for fine quality plating and prompt service. August 31, A.


Our barrel, station line enables us to process thousands of pounds of material every day. High strength steels tensile strength greater than M. Can be dyed practically any color or shade. Class 3 Class 3 chemical coatings are intended as a corrosion preventive film from electrical and electronic applications where low resistance contacts are required. As much as the last layer of the passivation is thin the electrical resistivity is low. Obviously, this must be clarified by the customer.

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 deposit. Does anybody know this info?

Zinc Coating

High strength steels tensile strength greater than MPa shall not be electroplated. Has a low coefficient of thermal expansion-is magnetic. Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low. Color is gray white in plated condition. The type of passivation is determined according to the required characteristics, and is divided into groups:.

Our plater said that he would be willing to go thicker on the clear.

For corrosion protection Grade A: Corrosion Resistance Requirements Types. Zinc coating with phosphate passivation.