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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Historical Version s – view previous versions of standard.
Certain precious-metal surfaces, such as gold, may exhibit water break, even though clean. The addition of emulsi?
ASTM B322 – 99(2014)
However, this action may be bene? Because of the rapid penetrating action of the solvent and solvent vapor, this method is effective in cleaning parts containing recesses, blind holes, perforations, crevices, and welded seams. With die castings, care must be exercised to avoid cutting through the surface by excessive buffing.
Be sure that the bus bars are clean to ensure good contact. Drying of the cleaner on the work atsm rinsing should be avoided by having fog nozzles after cleaning tanks, if necessary, or by decreasing transfer time or operating temperatures.
Impurities derived from processing cannot be ignored; that is, rinse waters must be changed frequently or over? Tolerance for soaps, formed by reaction with the soils, can be designed into the cleaner when necessary. The cleaners usually contain surface-active, soap-like materials which astk if agitated vigorously.
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Methods of removal b232 heat-treat or mill scale are not included in these methods, because they are covered in practices referring to speci? Often, depending largely on the amount and type of soil on the workpieces as received, one or more of these stages may be eliminated or modified. Without air during operation, anerobic bacteria are produced and the cleaner will take on a noticeable, unpleasant odor. The fact that individual suppliers of proprietary cleaning materials have hundreds of standard products available indicates the complexity of this?
These stages are discussed in three parts: Part I —Precleaning use of a solvent, emulsion, or alkaline spray to remove the bulk of the soil.
The use of automatic auxiliary stills in conjunction with the degreaser allows continuous cleaning operation and solvent recovery. Drawing compounds with polymerizing oils or white lead pigment are to be avoided because of difficulty in cleaning. Oxygen gas does not enter metals as zstm does. Part II—Intermediate alkaline cleaning.
Norma ASTM B()
Air sparging also improves overall cleaning efficiency by promoting transfer of oil and grease particles from part surface into the cleaning solution. Last previous edition approved in as B — Check the current with tong ammeters if available and calculate current density. Bath life is in? Some cleaners containing chlorinated solvents are used above the?
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? If this is a cause, a high-pressure solvent spray will often help.
Alkaline chelated derusting and cleaning solutions, alone or with sodium cyanide, used as a soak or electrocleaner, are often preferred before electroplating on ferrous alloys. The choice of these procedures must be based on a knowledge of the metals to be cleaned and of the soils to be removed.
Often, depending largely on the amount and type of soil on the workpieces as received, one or more of these stages may be eliminated or modi? Prolonged storage or drying of emulsion drawing compounds after metal working should be avoided so that slimy water-in-oil emulsions do not form.
Often, depending largely on the amount and type of soil on the astm b as astm b, one or more of these stages may be eliminated or modified. On the other hand, simple dipping in solvent is frequently ineffective.
Part III —Final electrocleaning, to remove trace solids and especially adherent impurities. Ast emulsion cleaners yield a water-shedding surface, the effect on water-break due to accumulated oils is difficult to differentiate from asm due to the solvent.
ASTM B PDF DOWNLOAD
Where sensitive metals have been precleaned, a slight attack or oxidation of the surface, when anodically cleaned, is considered bene? Degreaser tanks should preferably be cleaned and astj from outside the tank. In electrodeposition a surface is required which will receive a smooth, adherent metal deposit, but this is not necessarily an absolutely clean surface.
Soil, type of water, available time, rinsing facilities, type of metal, heating, and agitation available, facilities for disposal astj cleaner, and type of personnel and equipment all in? This involves visual observation after a? Sometimes a change in soils may require a change in cleaners or a change in the method of cleaning. This time ashm shortened if agitation is vigorous, temperatures high, and concentration high. Lead alloys are rapidly attacked and nickel and silver surfaces become passivated, requiring special activating treatments for subsequent electrodeposits.
NOTE 5—Nonferrous metals are tarnished or attacked if anodic cleaning is prolonged in an uninhibited electrocleaning solution.