ASTM B633-85 PDF
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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I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. Zinc coating with phosphate passivation. Also, I found out that the casting is painted after plating. Numeral indicates thickness in micrometers. August 31, A. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing.
Type II chromates are more commonly used where greater corrosion resistance is required, e. The rust not only harms the aesthetically smooth look, but also its mechanic needs. Can anyone give me some direction on how to get the customer to accept going to clear. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in h633-85 automotive industry.
ASTM B – 85e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast. Could you explain this? No it does not imply that. Colorful RoHS compliance passivation gives corrosion resistance ability of hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor. A Iron or steel with zinc electroplate.
ASTM B-633 Type II vs. III zinc plating
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. The type of passivation is determined according to the required characteristics, and is divided b6333-85 groups: Our plater would like to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
A light yellow would be better than a clear.
The black layer has also additional target —prevention of light reflection from the part and is used for optical parts. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
Go to main content. What process variation would produce these different wstm Surfaces to be painted should be ONLY lightly chromated. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
The exterior visual determined according to last layer. Put the chromate on light.
Surfaces left-bare should be heavily chromated. As much as the last layer of the passivation is thin the electrical resistivity is low.
The above entries are somewhat dated: The Zinc coating provides a smooth look as well as good anti-corrosive protection. The Standard default is gold for type II coatings unless otherwise specified. This is not considered a decorative finish and will not generate matching parts. III is colorless and not expected to hold up as long as the colored II. Our Zinc coating is carried out according to: Answer is based upon pre versions of B, What type of zinc plating bath is your plater using?
Corrosion Resistance Requirements Types. Yellow-iridescent Black Olive Green. Kaushik, The “Types” ast supplementary finishes to be done after the plating.
He passed away May 14, Decorative charastreistics The exterior visual determined according to last layer. III zinc plating A discussion started in but continuing through Q. The answer is Yes.
Zinc coating with colorful RoHS compliance passivation. This applies to all metals.