ASTM B Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel. Buy ASTM B SPECIFICATION FOR ELECTRODEPOSITED COATINGS OF ZINC ON IRON AND STEEL from SAI Global. ASTM B Type II and III zinc chromate plating Q&A’s. In my opinion a Mil-C- [link is to free spec at Defense Logistics Agency, ] plating.
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It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
If heavier coatings are required, allowance b6333 the deposit buildup must be made during the manufacture of the threaded articles.
Perhaps some confusion with Service Condition SC 2 moderatewhich indicates a minimum zinc thickness of 8 microns and is commonly clear chromated Type III. Kaushik, The “Types” define supplementary finishes to be done after the plating. They may be reconsidered for inspection in accordance with Test Method B As a result of large-scale and long-range tests conducted by ASTM and other organizations, there is excellent information on the corrosion behavior of zinc and zinc coatings.
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.
Zinc Plating: ASTM B Type II vs. III
Put the chromate on light. A number in parentheses indicates the year of frwe reapproval. Please forgive any resultant repetition or failures of chronological order. NOTE 4—The dimensional tolerance of most threaded articles, such as nuts, bolts, screws, and similar fasteners with complementary threads, normally does not permit the application of a coating thickness awtm greater than 8.
But if you are looking for something indisputably blue, as opposed to clear with a possible slightly bluish cast, this probably requires dye. The following data, based on worldwide testing, can be used to compare the behavior of electrodeposited coatings of zinc in various atmospheres.
Olive green and Black passivation is thick and has high electrical resistance. What do you say? Last previous edition approved in as B — 98e1. To me “bright blue” does not usually literally mean “bright blue” like the sky or a robin’s egg.
These separate specimens shall be introduced into a lot at regular intervals before the cleaning operations, preliminary to electroplating, and shall not be fdee therefrom until after completion of electroplating.
ASTM B-633 Type II vs. III zinc plating
The purchaser retains the right to perform any of the inspections and tests set forth in this speci? NOTE 5—Thickness methods that rely on the purity of the zinc deposit may not be sufficiently v633 when evaluating coatings produced from non-cyanide zinc solutions.
The inspection lot is then classi? Iridescent and Colorless passivation is thin and has low electrical resistance. How do you know if it is supposed to be Zinc Yellow or Zinc Clear?
This standard has been approved for use by agencies of the Department of Defense. Zinc coating with colorful RoHS compliance passivation.
When Test Methods BBor B are used, remove the supplementary treatment prior to testing. III zinc plating A discussion started in but continuing through Frde.
Materials and Manufacture 6.
What process variation would produce these different results? Regarding the question asked in letter ; Type II zinc plating vs. The coating shall not be stained or discolored. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations.
Colorful chromate passivation gives fre resistance ability of 96 hours according to ASTM B until white spots-intended to parts used in a high corrosive environment —outdoor. The part is currently being produced in China and my local platers are suggesting a dye to get a blue color. Originally approved in Trivalent chromates give paler and lighter finishes; some use metals, some use permanganates, some use dyes, in order to replicate the Hex finish.