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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This bath will deposit chromium at an appropriate rate of Lead cathodes should be used and the tank constructed of a material, such as lead or vinyl, that is resistant to sulfuric acid. If this is a design consideration, the use of mechanical methods such as shot peening see Ast, B or MIL-SC, or both or autofrettage to compressively stress the surface asgm increase the fatigue strength.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Please first log in with a verified email before subscribing to alerts. Drag-over of aastm solution into the chromium electroplating bath because of poor rinsing will cause contamination problems. Most proprietary chromium plating baths are co-catalyzed plating solutions in which an additional catalyst is used in conjunction with the traditional sulfate anion catalyst.
These co-catalysts may use asgm 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.
Already Subscribed to this document. Baking appropriate for the tensile strength of the electroplated part must be performed to reduce the risk of hydrogen embrittlement. Your Alert Profile lists the documents that will be monitored.
ASTM B177/B177M – 11(2017)
In general, only deoxidizing of the copper or copper alloy surface is necessary for chromium electroplating. Nonmagnetic Coatings on Magnetic Basis Metals. Nevertheless, if the procedures cited in the appropriate references are followed, the bond strength is such that grinding and honing can be conducted without delamination of the coating.
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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Any mechanical operations that can result in grinding checks or glazing of the metal are detrimental and should be eliminated.
Platinum, platinumclad niobium, or even steel rods or wire may be used for internal electroplating of small holes, but the latter will contaminate the bath with iron. This standard is not included in any packages.
Standards Subsctiption may be the perfect solution. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently atsm the other.
There are additives, such as selenium, in the patent-free art which will also produce micro-cracked deposits.
The required surface smoothness may be obtained by suitable chemical, mechanical, or electrochemical procedures. The removal of the ever-present, tenacious oxide lm on the surface astmm aluminum is what makes electroplating difficult. Deoxidizing and Etching 6. Subscription pricing is determined by: Chemical lead is also satisfactory where hardness and rigidity are not important.
Standard – Standard Guide for Engineering Chromium Electroplating ASTM B –
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Specied chromium electrodeposits on ferrous surfaces are dened in Specication B A superscript epsilon e b77 an editorial change since the last revision or reapproval.
If parts have been shot-peened to develop a compressively stressed surface, it is important to avoid removing that surface by excessive grinding. In operating these baths, it is essential that no sulfate be introduced into the bath.
When conditions g177 especially unfavorable, denite steps must be taken to meet this important requirement, including storage in a noncorrosive environment, or the use of a suitable coating to exclude air and moisture.
To reduce the increase in roughness resulting from etching, the etching times should be kept as short as is consistent with good adhesion, particularly in the case of highly nished surfaces. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Standard Guide for Engineering Chromium Electroplating
Last previous edition B — Tank voltage is normally 4 to 5 V. This abstract is a brief summary of the referenced standard. The sulfate anion SO42— is added to the bath as sulfuric acid.
Consult safety references or personnel before using. Most nonferrous metals enter the chromium plating solution under live current and are not placed in the chromium-plating solution for warming prior to electroplating.
Polarized surfaces in high-nickel stainless steels can asttm skip plating if not properly activated. Materials such as aluminum and titanium have an inherent oxide lm on the surface that can only be removed or minimized ast prior to the electroplating process see 6.
If grinding is very aggressive, removing a large amount of metal per grinding pass and generating high localized temperatures, the chromium is apt to develop a network of macrocracks b77 to the naked eye. A number in parentheses indicates the year of last reapproval. Please first verify your email before subscribing to alerts.
Current edition approved Nov.