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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Historical Version s – view previous versions of standard.

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.

However, it tends to form great quantities of scale that may fall off on the work and cause pitting or roughness.

ASTM B/BM – 11() – Standard Guide for Engineering Chromium Electroplating

Last previous edition B — You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

The calculated amount should be diluted by adding it to deionized water prior to adding it to the bath. Nevertheless, if the procedures cited in the appropriate references are followed, astmm bond strength is such that grinding and honing can be conducted without delamination of the coating.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may b1177.

As the electrochemical efficiency decreases somewhat with increasing current density and bath temperature, the increase in the plating rate is not linear with the increase in the current density. Aluminum, titanium, and certain nickel alloys may need to have cleaning and etching operations done before racking due to entrapment of cleaning and etching solutions in the plating rack which can result in adhesion failures aetm to seepage during chromium electroplating.

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ASTM B177/B177M – 11(2017)

Please first verify your email before subscribing to alerts. Mild steel anodes are usually employed. This standard is not included in any packages.

If grinding is very aggressive, removing a large amount of metal per grinding pass and generating high zstm temperatures, the chromium v177 apt to develop a network of macrocracks visible to the naked eye. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. In all cases, the duration of the bake shall commence from the time at which the whole of each part attains the specied temperature.

Standard Guide for Engineering Chromium Electroplating

Analytical control of the silicouoride is more difficult than the other components, but ion selective methods are satisfactory. 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.

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. It is the responsibility of the user of this ashm to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

This standard is also available to be included in Standards Subscriptions. There are also proprietary solutions available.

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There are many modications reported in the astk and some manufacturers offer proprietary baths. Nonmagnetic Coatings on Magnetic Basis Metals. Racks and Anodes 4.

Some stainless steels benet from a Woods nickel strike prior to chromium electroplating. Your Alert Profile lists the documents that will be monitored. There does not have to be rinsing before transfer to the plating tank, but parts should be thoroughly drained to prevent spillage of the etching solution. 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.

Baking appropriate for the tensile strength of the electroplated part must be performed to reduce the risk of hydrogen embrittlement.

ASTM B工程用钢表面镀铬_百度文库

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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Test methods in accordance with Test Methods B can measure coating thicknesses from 2. In general, anodic etching in the chromium plating solution is not recommended.

Shorter times at higher temperatures may be used, if the resulting loss in surface hardness is acceptable.