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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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.
It should also be astm b that while these procedures are broadly applicable, particular substrates may require certain specific cleaning procedures. Historical Version s adtm view previous versions of standard. 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.
Anodic electrocleaning solutions have much more tolerance for chromic acid contamination. Combining these with hand brushing is excellent but does not lend asm to production conditions.
Norma ASTM B()
Alkaline chelated derusting and cleaning solutions, alone or with sodium cyanide, used as a soak astn electrocleaner, are often preferred before electroplating on ferrous alloys. Too high a current density when electrocleaning cathodically will cause electroplating out of dissolved metals and some colloids as a smut. In certain circumstances, especially with materials used in the electronic industry, such electroplating defects may arise from other factors as well.
Related Products Searching for related products Usually, even with light soils, it is advisable to astm b multistage cleaning, thereby increasing the life and efficiency of the cleaning solutions. The concentration of the cleaner should be controlled by analysis at regular intervals.
B3222 the soils are present asym surfaces that are not readily accessible, the process is sometimes supplemented by ultrasonic cleaning in the solvent rinse chamber.
Further, intimate contact of the metal surface with the aqueous phase permits removal of materials not soluble in the hydrocarbon phase.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Hydrogen gas is evolved on the surface. This treatment activates the metal and is usually accomplished in g322 baths which also serve to neutralize the residual alkaline film from alkaline cleaning. Spray nozzles should not be allowed to clog with solids and vestibules should be provided at each stage of the machine to avoid contamination by overspray.
This standard does not purport to address all of the safety problems associated with its use. Because most experience and knowledge in cleaning have been obtained by suppliers of proprietary processes and formulations, these asrm should be consulted before setting up a cleaning process.
Emulsion machining lubricants soluble oils b232 be used in place of sulfurized cutting oils if operations permit. If doubt exists as to polarity, check with a voltmeter, or trace back the conductors to the current source. 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.
A cleaner may be very effective for xstm group of soils, yet poor for other soils. Tolerance for soaps, formed by reaction with the soils, can be designed into the cleaner when necessary. Substitution of liquid for solid buffing compound, if work permits, often gives easier cleaning, if properly applied, but may require use of a different type of cleaner.
For cold-solvent operations, adequate ventilation must be provided in the work area. If buffing or drawing compounds or oils have changed, the new soils may be more difficult to clean.
Part IV —Trouble shooting. Rinse tanks should have adequate over? The common electroplates applied are usually copper, nickel, and chromium astm b decorative and functional n The use of clean gloves should be mandatory after buffing or polishing to avoid?
Airborne contaminants can be avoided by using covers over stored work. Investigate introduction of any new soils that might cause the cleaner to become exhausted prematurely. If the same trouble is evident atsm these parts, it can usually be concluded that the trouble bb322 in the electroplating baths or elsewhere and not in the preparatory part of the cycle.
The addition of emulsi? You have successfully saved to your supplier list. Care must be taken to avoid redeposition of the soil as parts exit from the cleaner. The degree of cleanliness required for metals to be electroplated is greater than for Part II -Intermediate alkaline cleaning. Alkaline chelated derusting and cleaning solutions, alone or with sodium cyanide, used as a soak or electrocleaner, are astm b preferred astm b electroplating on ferrous alloys.
Some electroplaters use the term precleaning for alkaline cleaning before electrocleaning, especially when solvent cleaning is carried out at a different part of the plant.
Temperatures are usually lower than for soak cleaning because of mechanical factors. This treatment activates the metal and is usually accomplished in acid ast which also serve to neutralize the residual alkaline film from alkaline cleaning.
This time is shortened if agitation is vigorous, temperatures high, and concentration high. Petroleum and aromatic solvents of low? A number in parentheses indicates the year of last reapproval. Ast, you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Otherwise, antifoaming ingredients are a part of the formulations. Diluted emulsion cleaners usually have? NOTE 3—Electrocleaning represents a special method of agitation and is considered in In order for bioremediation to proceed, particles must be detached from the part surface.
Part I —Precleaning use of a solvent, emulsion, or alkaline spray to remove the bulk of the soil. Surface oil should be skimmed frequently, preferably by over? Part II —Intermediate alkaline cleaning.
BGM Fastener Grade 8 Product Specifications
The cleaners usually contain surface-active, soap-like materials which foam if agitated vigorously. Parts going immediately to electroplating should be free from any objectionable?
Because of this electrolytic action special types of cleaners are required see The use of automatic auxiliary stills in conjunction with the degreaser allows continuous cleaning operation b232 solvent recovery.