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).
|Published (Last):||20 March 2004|
|PDF File Size:||6.95 Mb|
|ePub File Size:||19.96 Mb|
|Price:||Free* [*Free Regsitration Required]|
Kaushik, The “Types” define supplementary finishes to be done after the plating. Rest in peace, Ken.
ASTM B – 85e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Put the chromate on light. Please forgive any resultant repetition or failures of chronological order. Yellow chromate should get 96 hrs to failure. What type of zinc plating bath is your plater using? The exterior visual determined according to last layer. A light yellow would be better than a clear. But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. Does anybody know this info?
August 31, A. I’ve seen this done less commonly on chromated zinc plating than on chromated aluminum.
ASTM B-633 Type II vs. III zinc plating
This applies to all metals. Don Penzenik – Elkhart, Indiana. Any information would be well received.
Zinc coating with colorful chromate passivation. Mark Hollenbeck alloys – Muskegon, Michigan A. 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. To determine the nature of accuracy or revision level please verify above data with current releases: SC 4 very severe. Also, some yellow chromates are clear w. This is not considered a decorative finish and will not generate matching parts.
Zinc Plating: ASTM B Type II vs. III
The above entries are somewhat dated: The coating is made according to demand, where the distribution ashm as follows: Hi, I recently received 2 batches of parts from two separate platers using this specification. Regarding the question asked in letter ; Type II zinc plating vs.
Supplementary treatments shall be in accordance with Recommended Practice B Our Zinc coating is carried out according to: Going with clear will make it difficult to tell what is clear chromated zinc vs.
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 plater would like to go to a clear zinc, but our customer is under the assumption that the clear b633-5 not do as good a job with corrosion resistance and salt spray life.
What process variation would produce these different results? As much as the last layer of the passivation is thin the electrical resistivity is low. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. The rust aastm only harms the aesthetically smooth look, but ast its mechanic needs. They share, however, the most basic of metal finishing requirements: Colorless Axtm compliance passivation gives corrosion resistance ability of 72 hours according to ASTM B until white spots-also intended to parts used in a high corrosive environment —outdoor.
There are different passivation colors: Trivalent chromates give paler and lighter finishes; some b6338-5 metals, some use permanganates, some use dyes, in order to replicate the Hex finish. I need to specify platings that do not contain Hexavalent Chromium for parts that will be used in the automotive industry.
That seems a bit discretional to me. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate. 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.
Does plating make that big a difference knowing that it’s going to be painted also? Corrosion resistance Colorful chromate passivation gives corrosion resistance ability of 96 hours according to Astmm B until white spots-intended to parts used in a high corrosive environment —outdoor. B Where service conditions are valid only for coatings with chromate conversion coating.
B63-385 there any colour difference OR is there any Salt spray difference? Could you explain this? Also, I found out that the casting is painted after plating.
bb633-85 Until a very few years ago chromate asm coatings were based on hexavalent chromium, and deposited a thick film that was relatively easy to dye. Different brands of chromate conversion chemistry, possibly different plating processes acid zinc vs.
I have the exact same questions. The revision addresses RoHS concerns and specifically allows non-hexavalent chromate treatments. Obviously, this must be clarified by the customer. So if you need to color match, you need to do it with a requirement for compliance with sample parts — not a verbal description. The answer is Yes. Yellow-iridescent Black Olive Green.