ASTM Standards: B Practice for Operating Salt Spray (Fog) Apparatus2. B Guide for Engineering Chromium Electroplating3. B Practice for. Endorsed by AmericanDesignation: B – 01 (Reapproved )e1. ASTM B/BM() Standard Guide for Engineering Chromium Electroplating Scope
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Test methods in accordance with Test Methods B can measure coating thicknesses from 2. This is a very dangerous exothermic reaction.
ASTM B – 01 Standard Guide for Engineering Chromium Electroplating
Consult safety references or personnel before using. Any mechanical operations that can result in grinding checks or glazing of the metal are detrimental and should be eliminated. Combining values from the two systems may result in non-conformance with the standard. This guide provides information on the deposition of engineering chromium by electroplating. If the document is revised or amended, you will be notified by email. Steel or ferrous parts to be plated are allowed to reach the bath temperature and electroplating is then commenced.
This bath will deposit chromium at an appropriate rate of In all cases, the duration of the bake shall commence from the time at which the whole part attains the specied temperature.
NOTE 7—The effectiveness of hydrogen embrittlement relief baking of chromium-plated high-strength steels can be tested in accordance with Test Method F This acid also requires great care in handling. Last previous edition B — Nevertheless, if the procedures cited in the appropriate references are followed, the bond strength is such that grinding and axtm can be conducted without delamination of the coating.
The deposits are dull gray in color and can be buffed, if desired.
N177 using test methods in which a zinc immersion lm is applied to the aluminum surface for protection against oxide formation, the article to be plated must enter the chromiumplating solution under live current. The preceding solution should, of course, be handled with all the caution required of standard chromium plating baths. There are additives, such as selenium, in the patent-free art which will also produce micro-cracked deposits.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. These co-catalysts may use organic based or inorganic based compounds to achieve higher plating efficiencies and are often employed where higher rates of plating and better throwing and covering power are needed.
Proprietary baths should be evaluated for the tendency towards macrocracking if fatigue life is an important design consideration. The lower concentrations give increased efficiency but the throwing power, which is 7. In general, anodic etching in the chromium plating solution is not recommended.
Standard Guide for Engineering Chromium Electroplating
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. This stress relief is essential if hydrogen embrittlement from subsequent operations is to be avoided. Practice B offers many ways to prepare titanium prior to chromium electroplating. The main difficulty with these materials when chromium plating is polarization of the nickel alloy surface prior to plating which results in deactivation of the material and skip plating.
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Lead wire used for small anodes should contain 0. If parts have been shot-peened to develop n177 compressively stressed surface, it is important to avoid removing that surface by excessive grinding.
ASTM B177/B177M – 11(2017)
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. Combining values from the two systems may result in non-conformance with the standard.
As the voice of the U. This is sometimes called “functional” or “hard” chromium and is usually applied directly to the basis metal and is usually thicker than decorative deposits.
Need more than one copy? Deoxidizing and Etching 6. This aetm will greatly reduce the fatigue life of the part and should be h177.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. For deposits up to 50 m 2 milsTest Method B may be used and does not destroy the part, but does remove the chromium electrodeposit on the area tested, which may necessitate replating. Drag-over of either solution into the chromium electroplating bath because of poor rinsing will cause contamination problems.
Chromium electrodeposits do not exhibit leveling, and consequently the surface roughness of the electrodeposit will always be greater than that of the substrate. A number in ashm indicates the year of last reapproval.