ASTM B177 PDF
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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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. There are additives, such as selenium, in the patent-free art which will also produce micro-cracked deposits. NOTE 6—It is suggested that the selection of an appropriate bake be discussed with the purchaser to ensure that the bake selected does not cause distortion in the part or adversely affect its mechanical properties.
Subscription pricing is determined by: Baking appropriate for the tensile strength of the electroplated part must be performed to reduce the risk of hydrogen embrittlement. Historical Version s – view previous versions of standard. The preceding solution should, of course, be handled with all the caution required of standard chromium plating baths. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Originally published as B — Specied chromium electrodeposits on ferrous surfaces are dened in Specication B Leadsheathed steel, copper, or silver may be used when indicated by requirements for strength or conductivity. Mild steel anodes are usually employed.
Standard – Standard Guide for Engineering Chromium Electroplating ASTM B –
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. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
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.
B — 01 Endorsed by American Electroplaters’ Society Endorsed by National Association of Metal Finishers Standard Guide for Engineering Chromium Electroplating1 This standard is issued under the xed designation B ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
The bond strengths of the chromium varies with metallic substrate. The deposits are dull gray in color and can be buffed, if desired. The procedure and zstm for the following are detailed: This should be done after any stressrelieving heat treatment. 1b77 superscript epsilon e indicates an editorial change since the last revision or reapproval. Need more than one copy? NOTE 1—Many factors inuence the choice of current densities. There are many modications reported in the literature and some manufacturers offer proprietary baths.
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. To reduce the increase in roughness resulting b1777 etching, the etching times should be kept as short as is consistent with good adhesion, particularly in the case of highly nished surfaces. This guide provides information on the deposition of engineering chromium by electroplating.
Nonmagnetic Coatings on Magnetic Basis Metals. As the voice of the U. There are also proprietary solutions available.
Specified chromium electrodeposits on ferrous surfaces are defined in Specification B Asstm the document is revised or amended, you will be qstm by email. Link to Active This link will always route to the current Active version of the standard.
Shorter times at higher temperatures may be used, if the resulting loss in surface hardness is acceptable. Chromium electrodeposits do not exhibit leveling, and consequently the surface roughness of the electrodeposit will always be greater than that of the substrate.
Standard Guide for Engineering Chromium Electroplating
This standard is not included in any packages. This abstract is a brief summary of the referenced standard. Practice B offers many ways to prepare titanium prior to chromium electroplating. In operating these baths, it is essential that no sulfate be introduced into the bath.