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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The choice of these procedures must be based on a knowledge of the metals to be cleaned and of the soils to be removed. Certain precious-metal surfaces, such as gold, may exhibit water break, even though clean. Zinc die castings have surfaces that require special care because of sensitivity to attack by cleaning solutions. Part III —Final electrocleaning, to remove trace atm and especially adherent impurities.
If alkali gets on the skin, it should be washed profusely with water and medical attention received promptly.
The cleaner should be formulated for its method of application. The effective life of a cleaning bath must be estimated and baths discarded when exhausted. Things to look for are water breaks aztm after acid dipsexcessive darkening or etching, smuts, irregularity in appearance, and stains. These must be in sufficient quantity to wet and emulsify residual oil and b22 The degree of cleanliness required for metals to be electroplated is greater than for most other finishes.
Investigate introduction of any new soils that might cause the cleaner to become exhausted prematurely.
ASTM B322 – 99(2014)
For the same reason, it is sometimes necessary to operate at lower pressures even though higher pressures give better cleaning. A rolling boil provides agitation. Attention should be given to proper 2 procurement since, even in the same category, not all cleaners are equally effective.
In certain circumstances, especially with materials used in the electronic industry, such electroplating defects may arise from other factors as well. Combining these with hand brushing is excellent but does not lend itself to production conditions.
With some cleaners, adequate rinsing is difficult to obtain after the cleaner has dried on the work. To obtain true costs per thousand square feet of work processed all these factors must be included.
It should also be understood that while these procedures are broadly applicable, particular substrates may require certain specific cleaning procedures.
Electroplated articles are used in many industries such as the marine, automotive, plumbing fixtures, and appliance industries. Part II awtm alkaline cleaning. Descale the machine, if necessary, with inhibited hydrochloric acid or a proprietary descaling chemical to improve heating efficiency.
Too low a pH will render the bacteria too active resulting in consumption of the wetter and other organics necessary for proper cleaning. Some electroplaters use the term precleaning for alkaline cleaning before electrocleaning, especially when solvent cleaning is carried out asm a different part of the plant. Other methods, including electroplating and testing of the electroplate, should be used occasionally to con? Because data on methods and results of evaluation with electroplated astm b on tung Methods of removal of astm b or mill scale are not included in t 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.
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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Link to Active This link will always route to the current Astm b version of the standard. 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. Temperatures are usually lower than for soak cleaning because of mechanical factors.
On the other hand, simple dipping in solvent is frequently ineffective. Parts going immediately to electroplating should be free from any objectionable? Part III —Final electrocleaning, to remove trace solids and especially adherent impurities.
These stages are discussed in three parts: The addition of emulsi? Tolerance for soaps, formed by reaction zstm the soils, can be designed into the cleaner when necessary.
ASTM B – 99() Standard Guide for Cleaning Metals Prior to Electroplating
In electrodeposition a surface is required which will receive a smooth, adherent metal deposit, but this is not necessarily an absolutely clean surface.
Some cleaners require warm rinses for maximum efficiency. The choice of these procedures must be based on a knowledge of astm b metals to be cleaned and of the soils to be removed. It can be accurately stated, however, that many electroplating troubles can be traced to faulty cleaning.
Part Astmm —Trouble shooting. Link to Active This link will always route to the current Active version of the standard. Part IV -Trouble shooting.
If the plant conditions water for acidity or alkalinity care must be taken to be sure the solids content is not too high Note 1.
Solvent degreasing or emulsi? The common electroplates applied are usually copper, nickel, and chromium for decorative and functional uses. If possible, design of parts should avoid small indentations that atm to trap solid particles or buffing compositions.
Most oils and greases and some buffing and drawing compounds are effectively removed and contamination of the electrocleaning bath is lessened.