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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The end user must decide when a part fails, at “white rust” corrosion the chromate has failed or red rust both the chromate and the zinc are gone exposing the base metal. Our Zinc coating is carried out according to: So if I’m interpreting this correct, there is both a color difference and a salt spray difference.
Does plating make that big a difference knowing that it’s going to be painted also? Zinc coating with colorful RoHS compliance passivation. The rust not only harms the aesthetically smooth look, but also its mechanic needs.
The part is currently being produced in China and my local platers are suggesting satm dye to get a blue color.
Try using an acid zinc chloride bath and see if the casting covers. Also, I found out that the casting is painted after plating. Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though.
We are getting poor coverage on the astj surface of some steel castings using a yellow Zinc chromate.
The black layer has also additional target —prevention of light reflection from the part and is used for optical parts. Mark Hollenbeck alloys – Muskegon, Michigan A.
Please forgive any resultant repetition or failures of chronological order. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs.
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Certain castings are difficult, if not impossible, to plate in either cyanide or alkaline non-cyanide plating baths. It definitely implies Hex Chrome.
Ken Vlach – Goleta, California. According to G633 the homogeneous and non-homogeneous are defined in such manner that every one may understand that the layer is removable let’s see how.
Our plater said that he would be willing to go thicker on aastm clear. Olive Drab chromate is hrs. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing.
Answer is based upon pre versions of B, The type of passivation is b363 according to the required characteristics, and is divided into groups: 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: Ray Kremer Stellar Solutions, Inc. Did you ever get the answers you were looking for?
Iron metals rust relative quickly, even in a non-corrosive environment. As much as the last layer of the passivation adtm thin the electrical resistivity is low. ASTM B and all other worldwide standards were written around the time when no one spoke about trivalent. It would be “bright, blue” — that is, shiny and metallic but with a bluish rather than a yellowish cast.