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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Ray Kremer Stellar Solutions, Inc.
Numeral indicates thickness in micrometers. Hi, I recently received 2 batches of parts from two separate platers using this specification. You can get the same finish only for blue and black hex chrome with tri substitutes, but not for yellow or olive as of yet.
ASTM B-633 Type II vs. III zinc plating
The type of passivation is determined according to the required characteristics, and is divided into groups:. Also, some yellow chromates are clear w. Please forgive any resultant repetition or failures of chronological order.
That seems a bit discretional to me. A heavy chromate will shear under paint and cause the paint to peel. To determine the nature of accuracy or revision level please verify above data with current releases: They share, however, the most basic of metal finishing requirements: Zinc coating with phosphate passivation.
Zinc coating with colorful chromate passivation.
Zinc Plating: ASTM B Type II vs. III
High strength steels tensile strength greater than MPa shall not be electroplated. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg. We are getting poor b633–85 on the as-cast surface of some steel castings using a yellow Zinc chromate. Not the least of which is the environmental regulations impact on the future of the selected finish.
The type of passivation is determined according to the required characteristics, and is divided into groups: The end user must decide when a part fails, at “white rust” corrosion the chromate has v633-85 or red rust both the chromate and the zinc are gone exposing the base metal.
As much as the last layer of the passivation is thin the electrical resistivity is low. Thank you for your hard work which the finishing world continues satm benefit from. Is there any colour difference OR is there any Salt spray difference?
Some of today’s proprietary trivalent chromium coatings are very thin and consequently will not generate a highly saturated color though. Does plating make that big a difference knowing that it’s going to be painted also?
Try using an acid zinc chloride bath and see if the casting covers. A light yellow would be better than a clear. 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.
Kaushik, The “Types” define supplementary finishes to be done after the plating.
ASTM B datasheet & applicatoin notes – Datasheet Archive
The Zinc coating provides a smooth look as well as good anti-corrosive protection. To minimize your searching efforts and to offer multiple viewpoints, we’ve combined some threads into the dialog you’re viewing.
Supplementary treatments shall be in accordance with Recommended Practice Asttm Our Zinc coating is carried out according to: So if you need to color match, 6b33-85 need to do it with a requirement for compliance with sample parts — not a verbal description.
SC 4 very severe. Sorry, but if you need one particular look, you must go through the ugly process of maintaining sample boards with acceptable vs. Olive green passivation is a chromate passivation in a green hue that gives excellent corrosion resistance ability hours in a salt spray test and is a good base for paint. This applies to all metals. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color.
What process variation would produce these different results? III is colorless and not expected to hold up as long as the colored II.
The above entries are somewhat dated: Regarding the question asked in letter ; Type II zinc plating vs.