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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This standard is also available to be included in Standards Subscriptions. There are also proprietary solutions available which should be operated according to the supplier’s instructions. The values stated in each system may not be exact equivalents; therefore, each system shall be used b17 of the other. Guide B lists bakes appropriate aatm the tensile strength of the electroplated part and should be consulted for post-electroplating baking procedures and classes.
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 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. As the deposit is nonconductive, the maximum thickness that can be expected is 3 to 5 m which requires 4 to 8 min. In all cases, the duration of asgm bake shall commence from the time at which the whole part attains the specied temperature.
This process is much simpler than that in 6. Specified chromium electrodeposits on ferrous surfaces are defined in Specification B The bond strengths of the chromium varies with metallic substrate.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine bb177 applicability of regulatory limitations prior to use.
Standard Guide for Engineering Chromium Electroplating
Tank voltage is normally 4 to 5 V. Proceed to Checkout Continue Shopping. Chemical lead is also satisfactory where hardness and rigidity are not important. The sulfate anion SO42— is added to the bath as sulfuric acid.
ASTM B – 01 Standard Guide for Engineering Chromium Electroplating
All baths of this type include barium salts or other precipitants for sulfate. In operating these baths, it is essential that no sulfate be introduced into the bath.
The values stated in each system may not be exact equivalents; therefore, each system shall be bb177 independently of the other. Mild steel anodes are usually employed. A number in parentheses indicates the year of last reapproval.
Practice B offers many ways to prepare titanium prior to chromium electroplating. Historical Version s – view previous versions of standard. Already Subscribed to this document. Deoxidizing and Etching 6. 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.
We have no amendments or corrections for this standard. Test methods in accordance with Test Methods B can measure coating thicknesses from 2.
ASTM B177/B177M – 11(2017)
Last previous edition B — 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 b17 properties. This standard is not included in any packages. NOTE 1—Many factors inuence the choice of current densities. There are many modications reported in the literature and some manufacturers offer proprietary baths.
ASTM B / BM – 11() Standard Guide for Engineering Chromium Electroplating
The removal of the ever-present, tenacious oxide lm on the surface of aluminum is what makes electroplating difficult. Consult with appropriate safety manuals or safety personnel, or both, before handling sulfuric acid or chromic acid!
Polarized surfaces in high-nickel stainless steels can cause skip plating if not atm activated. 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.
The deposits are dull gray in color and can be buffed, if desired. 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. Substrate requirements including smoothness, fatigue, high-strength steel stress relief, and oxidation are specified.
Some stainless steels benet from a Woods nickel strike prior to chromium electroplating.