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
|Published (Last):||15 December 2015|
|PDF File Size:||10.92 Mb|
|ePub File Size:||19.73 Mb|
|Price:||Free* [*Free Regsitration Required]|
Combining values from the two systems may result in non-conformance with the standard.
Guide B offers many useful methods for preparing aluminum prior to chromium electroplating. Asgm B offers many ways to prepare titanium prior to chromium electroplating. The deposits are dull gray in color and can be buffed, if desired. This is sometimes called “functional” or “hard” chromium and is usually applied directly to the basis metal and is usually thicker than decorative deposits.
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 v177 bath. 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.
Nevertheless, if aztm 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.
In all cases, the duration of the bake shall commence from the time at which the whole part attains the specied temperature. Specified chromium electrodeposits on ferrous surfaces are defined in Specification B For deposits up to 50 m 2 milsTest Method B may be used and does not destroy the part, but does remove the chromium electrodeposit on the area tested, which may necessitate replating.
When using test methods in which a zinc immersion lm is applied to the aluminum surface for astk against oxide formation, the article to be plated must enter the chromiumplating solution under live current. Specied chromium electrodeposits on ferrous surfaces are dened in Specication B Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Nonmagnetic Coatings on Magnetic Basis Metals. 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. This bath will deposit chromium at an appropriate rate of Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Standard – Standard Guide for Engineering Chromium Electroplating ASTM B –
Deoxidizing and Etching 6. Your Alert Profile lists the documents that will be monitored. This is sometimes called “functional” or “hard” chromium and is usually applied directly to the zstm metal and is usually thicker than decorative deposits.
These co-catalysts may use organic based or inorganic based compounds to achieve higher plating efficiencies and are often employed where higher rates of plating and better throwing and covering power are needed.
Any auxiliary anodes integrated with the rack are connected to the anode bus bar. If parts have been shot-peened to develop a compressively stressed surface, it is important to avoid removing that surface by excessive grinding. Consult with appropriate safety manuals or safety personnel, or both, before handling sulfuric acid or chromic acid! B77 required surface smoothness may be obtained by suitable chemical, mechanical, or electrochemical procedures. 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.
Specified chromium electrodeposits on ferrous surfaces are defined in Specification B The procedure and requirements for the following are detailed: 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.
Substrate requirements including smoothness, fatigue, high-strength steel stress relief, and zstm are specified. The bond strengths of the chromium varies with metallic substrate. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
If the document is revised or amended, you will be notified by email. With very great agitation, the highest current density shown is possible with a concomitant decrease in the plating time. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to asttm. To reduce the increase in roughness resulting from etching, the etching times should be kept as short as is consistent with good adhesion, particularly in the case of highly nished surfaces.
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 B177/B177M – 11(2017)
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This standard is not included in any packages. As the deposit is nonconductive, the maximum thickness that can be expected is 3 to 5 m which requires 4 to 8 min. Steel or ferrous parts to be plated are allowed to reach the bath temperature and electroplating is then commenced.
Standard Guide for Engineering Chromium Electroplating
All baths of this type include barium salts or other precipitants for sulfate. There are many modications reported in the literature and some manufacturers offer proprietary baths. This abstract is a brief summary of the referenced standard. The removal of the ever-present, tenacious oxide lm on the surface of aluminum axtm what makes electroplating difficult.