ASTM B Type II and III zinc chromate plating Q&A’s. greater corrosion resistance is required, e.g., for SC3 & SC4 (13 & 25 microns zinc, respectively). 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). ASTM A/AM Low and Intermediate Tensile Strength Carbon Steel Plates .. ASTM B Electrodeposited Coatings of Zinc on Iron and Steel.
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This is not considered a decorative finish and will not generate matching parts. Surfaces to be painted should be ONLY lightly chromated. The black layer has also additional target —prevention of light reflection from the aatm and is used for optical parts.
Zinc Plating: ASTM B Type II vs. III
What do you say? Rest in peace, Ken. The problem may not be with the chromate at all.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
Hi, I recently received 2 batches of parts from two separate platers using this specification. A Blue with pale yellow is the best replacement for yellow as of now.
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing. Olive green passivation is a chromate passivation in a green hue that gives excellent corrosion resistance ability b63 in a salt spray test and is a good base for paint.
August 31, A.
From beautiful Pine Beach New Jersey: Ken Vlach – Goleta, California. Going with clear will make it difficult to tell what is clear chromated zinc vs. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
III is colorless and not expected to hold up as long as the colored II. Our plater said that he would be willing to go thicker on the clear. The coating is made according to demand, where the distribution is as follows: Colorless RoHS compliance passivation astn corrosion resistance ability of 72 hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor.
Please forgive any resultant repetition or failures of chronological order.
The Zinc coating provides a smooth look as well as good anti-corrosive protection. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though. Iridescent and Colorless passivation is thin and has low electrical resistance.
ASTM B-633 Type II vs. III zinc plating
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. I have the exact same questions. Iron metals rust relative quickly, even in a non-corrosive environment.
That seems a bit discretional to me. I’m not a zinc plater, but ‘Type II Clear’ seems self-contradictory. I am not getting the difference between this. No it does not imply zstm. II says “colored chromate coatings” meeting 96 hours of salt spray, and III says “colorless chromate conversion coatings” meeting 12 hours of salt spray. All I need to know is what color the types are. There are different passivation colors: What type of zinc plating bath is your plater using?
Zinc coating with colorful RoHS compliance passivation. The Standard default is gold for type II coatings unless otherwise specified.
Is there any colour difference OR is there any Salt spray difference? Could you explain this? I will be attending the ASTM B8 committee meetings in Philly later this week and will mention this letter to the sub-committee chair responsible for the B spec. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent.
Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. Answer is asrm upon pre versions of B, wstm Ray Kremer Stellar Solutions, Inc.
A heavy chromate will shear under paint and cause the paint to peel. Electrical charasteristics As much as the last layer of the passivation is thin the electrical resistivity is low. It definitely implies Hex Chrome. Also, aastm yellow chromates are clear w.