ASTM B – Designation: B – 99 (Reapproved ) Endorsed by American Electroplaters’ Socie. Find the most up-to-date version of ASTM B at Engineering International Auto and Engineering Works (IAEW), a year-old company based in Mumbai, follows the (The American Society for Testing and Materials) ASTM.
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Norma ASTM B()
If buffing or drawing compounds or oils have changed, the new soils may be more difficult to clean. 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 use. There are exceptions to this rule, astk in electrocleaning lead, magnesium, nickel, silver, and some stainless steels.
These stages are discussed in three parts: These stages are discussed in three parts:. It should also be understood that while these procedures are broadly applicable, particular substrates may require certain specific cleaning procedures. Link to Active This link will always route to the current Astm b version of the standard.
ASTM B322 – 99(2014)
Methods of removal of heat-treat or mill scale are not incl Methods of removal of heat-treat or astm b scale are not included in these methods, because they are covered in asmt referring to specific metals. Part IV —Trouble shooting. Part IV -Trouble shooting. A caked cleaner dissolves slowly.
Airborne contaminants can be avoided by using covers over stored work. In cathodic cleaning, little or no tarnish or attach of nonferrous metal occurs. The organic chelating agents are stable and offer another advantage over the polyphosphates in that they solubilize light oxide?
Historical Version s – view astj versions of standard. Insoluble soils buffing grits, metal chips and dust, etc. Too high a current density when electrocleaning cathodically will cause electroplating out of dissolved metals and some colloids as a smut.
The degree of cleanliness required for metals to be electroplated is greater than for most other finishes.
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. This treatment activates the metal and is usually accomplished in acid baths which also serve to neutralize the residual alkaline film from alkaline cleaning.
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A continuous sheet of water on the part usually indicates a clean surface. Proper ventilation cannot be overstressed because workmen will often discard a recommended gas mask.
Stop-off materials, when used, should be applied carefully in order to avoid contaminating signi? Care must be taken to avoid redeposition of the soil as parts exit from the cleaner.
A discussion of equipment is beyond the scope of this practice 2, 3.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Types of Electrocleaning Part I—Precleaning use of a solvent, emulsion, or alkaline spray to remove the bulk of the soil.
ASTM B PDF DOWNLOAD
Certain precious-metal surfaces, such as gold, may exhibit water break, even though clean. For example, efforts should be made to avoid overbuffing, leaving excessive compound on the work, or aging of the compound on the part before cleaning. Part III —Final electrocleaning, to remove trace solids and especially aetm impurities. Too low a pH will render the bacteria too active resulting in consumption of the wetter and other organics necessary for proper cleaning.
These stages are discussed in three parts:. The degree of cleanliness required for metals to be electroplated is greater than for Part II -Intermediate alkaline cleaning. Foaming may be a problem, unless the cleaner is b322 designed.