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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X-Ray uorescence may be used to measure very thin chromium deposits of 1 to 20 m 3 in.

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. Compressively stressing the substrate surface prior to plating by shot peening see Specication B or MIL-SC, or both or other means will help prevent any diminution of the fatigue life.

Chemical lead is also satisfactory where hardness and rigidity are not important. You may delete a document from your Alert Profile at any time. 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. Some stainless steels benet from a Woods nickel strike prior to chromium electroplating.

Please first verify your email before subscribing to alerts. Nonmagnetic Coatings on Magnetic Basis Metals.

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. Other test methods may be used by agreement between the purchaser and the aastm.

Shorter times at higher temperatures may be awtm, if the resulting loss in surface hardness is acceptable. The addition of uoride or silicouoride auxiliary catalysts increase the tendency of the bath to etch steel in unprotected low-current density areas, and more masking may be required than is necessary with the standard bath.

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Standard Guide for Engineering Chromium Electroplating

The most recent baths do not use uoride co-catalysts and do not etch unprotected low current density areas. Chromium electrodeposits do not exhibit leveling, and consequently the surface roughness of the electrodeposit will always be greater than that of the substrate. Last previous edition B — If this is a design consideration, the use of mechanical methods such as shot peening see Specication B or MIL-SC, or both or autofrettage to compressively stress the surface can increase the fatigue strength.

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 procedure and requirements for the following are detailed: Combining values from the two systems may result in non-conformance with the standard. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.

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. Materials such as aluminum and titanium have an inherent oxide lm on the surface that can only be removed or minimized just prior to the electroplating process see 6.

Consult safety references or personnel before using. Your Alert Profile lists the documents that will be monitored. In general, anodic etching in the chromium plating solution is not recommended. 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 Baking appropriate for the tensile strength of the electroplated ast, must be performed to reduce the risk of hydrogen embrittlement.

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ASTM B/BM() – Standard Guide for Engineering Chromium Electroplating

Need more than one copy? The preceding solution should, of course, be handled with all the caution required of standard chromium plating baths. This is a very dangerous exothermic reaction.

All baths of this type include barium salts or other precipitants for sulfate. This standard is subject to revision at any time by the b1777 technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. This guide provides information on the deposition of engineering chromium by electroplating.

Standards Subsctiption may be the perfect solution. Test methods in accordance with Test Methods B can measure coating thicknesses from 2.

Drag-over of either solution into the chromium electroplating bath because of poor rinsing will cause contamination problems. Historical Version s – 1b77 previous versions of standard.

This condition will greatly reduce the fatigue life of the part and should be avoided. Racks and Anodes 4.

Lead wire used for small anodes should contain 0. Tank voltage is normally 4 to 5 V. Polarized surfaces in high-nickel stainless steels can cause skip plating if not properly activated.

It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.