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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The preceding solution should, of course, be handled with all the caution sstm of standard chromium plating baths. If the anode contains little or no lead, the reoxidation of trivalent chromium to the hexavalent state will not take place or will be seriously impaired, which will lead to trivalent buildup in the plating solution and poor results. The sulfate anion SO42— is added to the bath as sulfuric acid.
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This should be done after any stressrelieving heat treatment. Substrate requirements including smoothness, fatigue, high-strength steel stress relief, and oxidation are specified. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. This bath will deposit chromium at an appropriate rate of There asfm not have to be rinsing before transfer to the plating tank, but parts should be thoroughly drained to prevent spillage of the etching solution.
In all cases, the duration of the bake shall commence from the time at which the whole part attains the specied temperature. Baking appropriate for the tensile strength of the electroplated part must be performed to reduce the risk of hydrogen embrittlement. 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.
ASTM B177/B177M – 11(2017)
However, it tends to form great quantities of scale that may fall off on the work and cause pitting or roughness. Depending on the type and nature of the metal and prior surface preparation steps, various deoxidation and etching methods may be used to activate the substrate prior to 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, at the address shown below.
The procedure and requirements for the following are detailed: This condition astk greatly reduce the fatigue life of the part and should be avoided. h177
Your Alert Profile lists the documents that will be monitored. Specified chromium electrodeposits on ferrous surfaces are defined in Specification B All baths of this type include barium salts or other precipitants for sulfate.
Lead wire used for small anodes should contain 0. Consult safety references or personnel before using.
Standard Guide for Engineering Chromium Electroplating
Test methods in accordance with Test Methods B can measure coating thicknesses from 2. 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.
Treatments of Chromium Coatings 8.
Chromium qstm from the higher concentration sulfate catalyzed baths are less prone to macrocracking during grinding than those asym under similar conditions from a cocatalyzed bath see 7. Proprietary baths should be evaluated for the tendency towards macrocracking if fatigue life is an important design consideration.
Guide B offers many useful methods for preparing aluminum prior to chromium electroplating. Proceed to Checkout Continue Shopping. If parts have been shot-peened to develop a compressively stressed surface, it is important to avoid removing that surface by excessive grinding.
When conditions are especially unfavorable, denite steps must be taken to astj this important requirement, including storage in a noncorrosive environment, or the use of a suitable coating to exclude air and moisture. 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.
These co-catalysts may use organic based or inorganic based compounds asm achieve higher plating efficiencies and are often employed where higher rates of plating and better throwing and covering power are needed.
ASTM B – 01 Standard Guide for Engineering Chromium Electroplating
When direct measurement of the thickness of the coating is desired and the part can be sacriced, it should be done in accordance with Test Method B Tank voltage is normally 4 to 5 V. Steel or ferrous parts to be plated are allowed to reach the bath temperature and electroplating is then commenced.
These deposits are frequently used on solar collectors and for applications on steels and other alloys where a more wearresistant coating than black oxide types is desired.