ASTM B322 PDF
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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BGM Fastener Grade 8 Product Specifications
Part III—Final electrocleaning, to remove trace solids and especially adherent impurities. The effective life of a cleaning bath must be estimated and baths discarded when exhausted. Because most experience and knowledge in cleaning have been obtained by suppliers of proprietary processes and formulations, these sources should be consulted before setting up a cleaning process.
Parts going immediately to electroplating should be free from any objectionable? Methods of removal of heat-treat or mill scale are not included in these methods, because they are covered in practices referring to speci? The chemical activity of the metal is an important and determining factor in cleaner selection. Sometimes a change in soils may require a change in cleaners or a change in the method of cleaning.
Alkaline cleaners vary in this respect; much depends on the amount of soil present on the work being cleaned. Current edition approved Oct. For cold-solvent operations, adequate ventilation must be provided in the work area. Foaming may be a problem, unless the cleaner is properly designed. These stages are discussed in three parts: This standard does not purport to address all of the safety problems associated with its use. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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Too low a pH will render the bacteria too active resulting in consumption of the wetter and other organics necessary for proper cleaning. Prolonged storage or drying of emulsion drawing compounds after metal working should be avoided so that slimy water-in-oil emulsions do not form.
Part I -Precleaning use of a solvent, emulsion, astm b alkaline spray to remove the bulk of the soil. Without air during operation, anerobic bacteria are produced sstm the cleaner will take on a noticeable, unpleasant odor.
However, their concentration must be low enough to prevent excessive foaming caused by the evolution of hydrogen and oxygen at the 6 electrodes.
Methods of removal of heat-treat or mill scale are not included in these methods, because they are covered in practices referring to specific metals. It is the responsibility astm b the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Nature of the Soil 3.
Roughness also may be caused by incomplete rinsing of alkaline soak or electrocleaners due to excessive water hardness or an exhausted cleaner bath. This involves visual observation after a? This time is shortened if aatm is vigorous, temperatures high, and concentration high.
Historical Version s – view previous versions of standard. Examples of materials that come under such regulations are: 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. Check the operation of the thermostat.
ASTM B PDF DOWNLOAD
Iron, steel, magnesium, and copper have better tolerance to alkaline cleaners. Bath life is in? Where the soils are present on surfaces that are not readily accessible, the process is sometimes supplemented bb322 ultrasonic cleaning in the solvent rinse chamber. Impurities derived from processing cannot be ignored; that is, rinse waters must be changed frequently or over?
The degree of cleanliness required for metals to be electroplated is greater than for most other finishes. Oxygen gas is evolved on the surface.
ASTM B322 – 99(2014)
Production must not be excessive before a new cleaner is made up. There should be sufficient heating capacity to keep the solution at the proper temperature during full production. If doubt exists as to polarity, check with a voltmeter, or trace back the conductors to the current source.
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. These all have a bearing on the proper functioning of cleaners. 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. Typically, optimum pH range for these types of cleaning systems is 8.
The addition of emulsi? The choice of these procedures must be based on a knowledge of the metals to be cleaned and of astj soils to be removed. The degree of cleanliness required for metals to be electroplated is greater than for most other finishes. Hydrogen gas is evolved on the surface. Additives for lubricating and sulfurized cutting oils are chosen for their ability to adhebe tenaciously and are difficult to remove.
The choice of these procedures must be based on a knowledge of the metals to astm b cleaned and of the soils to be removed. For more specific safety precautionary statements see Sections 11 and Check the current with tong ammeters if available and calculate current density.
The use of clean gloves should be mandatory after buffing or polishing to avoid? Often, depending largely on ast amount and type of soil on the workpieces as received, one or more of these stages may be eliminated or modified.
BGM Fastener Military Manufactured Products |Grade 8 Specifications Sheet
Aluminum requires care to avoid overetching in alkaline cleaners; both aluminum and zinc are sensitive to pitting attack, zinc and brass to tarnishing.
In certain circumstances, especially with materials used in the electronic industry, such electroplating defects may arise from other factors as well. In cathodic cleaning, little or no tarnish or attach of nonferrous metal occurs.
Other b3322, including electroplating and testing of the electroplate, should be used occasionally to con?