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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Unique activation procedures for steel exist with chromium plating that merit a separate discussion for successful plating as follows. Drag-over of either solution into the chromium electroplating bath because of poor rinsing will cause contamination problems. However, it tends to form great quantities of scale that may fall off on the work and cause pitting or roughness.

If grinding is very aggressive, removing a large amount of metal per grinding pass and generating high localized temperatures, the chromium is apt to develop a network of macrocracks visible to the naked eye.

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

Standards Subsctiption may be the perfect solution. Please first log in with a verified email before subscribing to alerts. This standard is not included in any packages. 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.

The design of racks for chromium electroplating on the various base metals previously mentioned for functional use should provide for the following to the greatest possible extent. Guide B lists bakes appropriate for the tensile strength of the electroplated part and should be consulted for post-electroplating baking procedures and classes.

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. Leadsheathed steel, copper, or silver may be used when indicated by requirements for strength or conductivity.

Consult Specication B for maximum length of time permitted between plating and baking operations. Historical Version s – view previous versions of standard.

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Specified chromium electrodeposits on ferrous surfaces are defined in Specification B ASTM does not asrm any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Literature references suggest preparing this bath by adding sodium hydroxide to a 4 Mol chromic acid solution. We have no amendments or corrections for this standard.

Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. B on areas that should be electroplated.

As the voice of the U.

ASTM B – 01 Standard Guide for Engineering Chromium Electroplating

There are also proprietary solutions available. Two difficulties that may be encountered that make this process less attractive than those described in 6. Face shield, chemical goggles, rubber gloves, and other safety equipment should be used when handling sulfuric acid and when atsm this addition.

This stress relief is essential if hydrogen embrittlement from subsequent operations is to be avoided.

ASTM B工程用钢表面镀铬_百度文库

A h177 epsilon e indicates an editorial change since the last revision or reapproval. Chromium electrodeposits do not exhibit leveling, and consequently the surface roughness of the electrodeposit will always be greater than that of the substrate.

Combining values from the two systems may result in non-conformance with the standard.

For parts loaded in compression or not subject aetm cyclical applications of stress during operation, or both, this may not be a consideration. Other test methods may be used by agreement between the purchaser and the seller. Lead wire used for small anodes should contain 0.

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. 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. This should be done after any stressrelieving heat treatment.

Subscription pricing is determined by: 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

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. This abstract is a brief summary of the referenced standard. Lead and aluminum tapes will provide a sharp line of demarcation between coated and uncoated areas with a minimum of buildup.

If parts have been shot-peened to develop a compressively stressed surface, it is important to avoid removing that surface by excessive grinding. G177 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. If the document is revised or amended, you will be notified by email.

You may delete a document from your Alert Profile at any aastm. 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. NOTE 7—The effectiveness of hydrogen embrittlement relief baking of chromium-plated high-strength steels can be tested in accordance with Test Method F The required surface smoothness may be obtained g177 suitable chemical, mechanical, or electrochemical procedures.

There are many modications reported in the literature and some manufacturers offer proprietary baths. Repair of Chromium Electrodeposits on Steel Substrates 9. Substrate requirements including smoothness, fatigue, high-strength steel stress relief, and oxidation are b17.

Hardness should be measured in accordance with Test Method B on a panel plated concurrently with the part unless the part can be sacriced. The calculated amount should be diluted by adding it to deionized water prior to adding it to the bath.