Zinc [ASTM-B] This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles. ASTM B ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL. The coating is made according to demand, where the distribution is as follows. Blue/Zinc. Blue/Zinc. Yellow/Zinc. Yellow/Zinc. ASTM B Type II SC 3 (FE/ZN 13). Type II SC 2 (FE/ZN 8). Type II SC 1 (FE/ZN 5). Type III SC 3(FE/ZN 13).

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A heavy chromate will shear under ast and cause the paint to peel. The black layer has also additional target —prevention of light reflection from the part and is used for optical parts.

Zinc Plating: ASTM B Type II vs. III

Rest in peace, Ken. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. So if I’m interpreting this correct, there is both a color difference and a salt awtm difference. 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.

Surfaces to be painted should be ONLY lightly chromated. II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. From beautiful Pine Beach New Jersey: To me “bright blue” does not usually asstm mean “bright blue” like the sky or a robin’s egg.

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ASTM B-633 Type II vs. III zinc plating

That seems a bit discretional to me. Also, some yellow chromates are clear w. Available colors are iridescent and b63-85 Colorless chromate passivation gives corrosion astn ability of 12 hours according to ASTM B until white spots-intended to parts used in a light corrosive environment —indoor.

As the USA moved toward metric fasteners, for a while there was a move to dye them blue. Iridescent and Colorless passivation is thin and has low electrical resistance. The rust not only harms the aesthetically smooth look, but also its mechanic needs.

I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.

Put the chromate on light. This applies to all metals. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. The Zinc coating on the steel does not last shiny for long, and so a further thick layer coating is added, called zstm. Zinc coating with colorless RoHS compliance passivation.

Zinc Coating

I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum. No it does not imply that. Try using an acid zinc chloride bath and see if the casting covers.

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Ray Kremer Stellar Solutions, Inc. I will be attending the ASTM B8 committee meetings in Philly later this week and b633-8 mention this letter to the sub-committee chair responsible for the B spec. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs.

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ASTM B datasheet & applicatoin notes – Datasheet Archive

Corrosion resistance Colorful chromate aztm gives corrosion resistance ability of 96 hours according to ASTM B until white spots-intended to parts used in a high corrosive environment —outdoor. All I need to know is what color the types are. This is not considered a decorative finish and will not generate matching parts.

Until a very few years ago chromate conversion coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye. Zinc plating is usually considered a functional coating, not a decorative one. 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. Please forgive any resultant repetition or failures of chronological order.

The type of passivation is determined according to the required characteristics, and is divided into groups: High strength steels tensile strength greater than MPa shall not be electroplated. No, other colors may not be available if my presumption is right. Answer is based upon pre b633-85 of B,