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A number in parentheses indicates the year of last reapproval. As much as the last layer of the passivation is thin the electrical resistivity is b6333.
Zinc coating with colorful chromate passivation.
The values are only relative, since individual studies in various parts of the world have resulted in? If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
B Where service conditions are valid only for coatings with chromate conversion coating. The type of passivation is determined according to the required characteristics, and is divided into groups:. This guide provides for two plans: It does not cover zinc-coated wire or sheets.
Iridescent and Colorless passivation is thin and has astn electrical resistance. When Test Methods BBor B are used, remove the supplementary treatment prior to testing. If the document is revised or amended, you will be notified by email.
For these reasons a?
ASTM B – Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Additional types have been added to permit awtm passivate treatments to be used in replacement of hexavalent chromium. Available colors are iridescent and black Colorless chromate passivation gives corrosion resistance ability of 12 hours according to ASTM B until white spots-intended to parts used in a light corrosive environment —indoor.
When such areas are designated, and thus made subject to minimum thickness requirements, the purchaser and the manufacturer shall recognize the necessity for either thicker deposits on other areas or for special racking. This standard is not included in any packages. 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.
Yellow-iridescent Black B633 Green. The purchaser may similarly require that a report of the test results be furnished. Test Method B contains several plans and also gives instructions for calculating plans to meet special needs. The inspection lot is then classi? The type of passivation is determined according to the required characteristics, and is divided into groups: The chromate, passivate, or supplemental?
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Current edition approved Jan.
NOTE 5—Thickness methods that rely on the purity of the zinc deposit may not be sufficiently accurate when evaluating coatings produced from non-cyanide zinc solutions.
The separate specimens may also be cut from scrap castings when ferrous alloy castings are being electroplated.
Electroplated springs and other parts subject to? Therefore, it is recommended that supplementary treatments not be applied to zinc coatings 077 a nominal thickness less than 5? Last previous edition approved in as B — 98e1. The electrical resistance of this green layer passivation is very high because it is thick in relative to other passivations.
In this event, the basis metal shall be subjected to such polishing or buffing operations as are necessary to yield deposits with the desired? Olive green and Black passivation is thick and has high electrical resistance.
Test Method B provides a default plan if one is not speci? Please first verify your email before subscribing to alerts. Iron metals rust relative quickly, even in a non-corrosive environment. Decorative charastreistics The exterior visual determined according to last layer.