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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Literature references suggest preparing this bath by adding sodium hydroxide to a 4 Mol chromic acid solution.
ASTM B / BM – 11() Standard Guide for Engineering Chromium Electroplating
This stress relief is essential if hydrogen embrittlement from subsequent operations is to be avoided. Your Alert Profile lists the documents that will be monitored. Standards Subsctiption may be the perfect solution. The bond strengths of the chromium varies with metallic substrate. Two difficulties that may be encountered that make this process less attractive than those described in 6.
In all cases, the duration of the bake shall commence from the time at which the whole part attains the specied temperature. Chemical lead is also satisfactory where hardness and rigidity are not important. Guide B lists bakes appropriate for the tensile strength of the electroplated part and should be consulted for post-electroplating baking procedures and classes.
Nonmagnetic Coatings on Magnetic Basis Metals. This guide provides information on the deposition of engineering chromium by electroplating. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Consult with appropriate safety manuals or safety personnel, or both, before aztm sulfuric acid or chromic acid! NOTE 7—The effectiveness of hydrogen embrittlement relief baking of chromium-plated high-strength steels can be tested in accordance with Test Method F Racks and Anodes 4. Consult safety references or personnel before using.
ASTM B – 01 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by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Lead cathodes should be used and the tank constructed of a material, such as lead or vinyl, that is resistant to sulfuric acid. The deposits are dull gray in color and can be buffed, b1177 desired. It is the ashm of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Standard Guide for Engineering Chromium Electroplating
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, b1777 the address shown below. Shorter times at asfm temperatures may be used, if the resulting loss in surface hardness is acceptable.
Specied chromium electrodeposits on ferrous surfaces are dened in Specication B ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Any auxiliary anodes integrated with the rack are connected to the anode bus bar. There are also proprietary solutions available which should be operated according to the supplier’s instructions. B on areas that should be electroplated.
For parts loaded in compression or not subject to cyclical applications of b1777 during operation, or both, this may not be a consideration.
This abstract is a brief summary of the referenced standard. 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.
Practice B offers many ways to prepare titanium prior to chromium electroplating. Specified chromium electrodeposits on ferrous surfaces are defined in Specification B Drag-over of either solution into the chromium electroplating bath because of poor rinsing will cause contamination problems.
Face shield, chemical goggles, rubber gloves, and other safety equipment should be used when handling sulfuric acid and when making this addition.
Awtm baths of this type include barium salts or other precipitants for sulfate. This is normally used on highly nished steel requiring only a thin chromium deposit as its use may result in less adhesion than other procedures and in hydrogen embrittlement of the steel. Chromium electrodeposits do not exhibit leveling, and consequently the surface roughness of the electrodeposit will always be greater than that of the substrate.
Deoxidizing and Etching 6. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. In operating these baths, asrm is essential that no sulfate be introduced into the bath. The procedure and requirements for the following are detailed: If the parts were etched in the plating solution, plating is initiated when the parts are made cathodic at the end of the etching period using the reversing switch. There are additives, such as selenium, in the patent-free art which will also produce micro-cracked deposits.
A number in parentheses indicates the year of last reapproval. When 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.
Subscription pricing is determined by: Due to the high carbon content in iron castings, anodic etching leaves a carbon smut on the surface of the metal which results in poor adhesion of the chromium.