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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Methods of removal of heat-treat or mill scale wstm not included in these methods, because they are covered in practices referring to speci? 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 age of the cleaner. Part III —Final electrocleaning, to remove trace solids and especially adherent impurities. Part IV -Trouble shooting. Hence, every effort should be made to obtain efficient impingement at high pressure without pushing the work out of the spray area or off the racks.
There should be b3322 heating capacity to keep the solution at the proper temperature during full production. Most aatm and greases and some buffing and drawing compounds are effectively removed and contamination of the electrocleaning bath is lessened. The chemical activity of the metal is an important and determining factor in cleaner selection.
The high temperature reduces the viscosity of the soil. Surface oil should be skimmed frequently, preferably by over? Stop-off materials, when used, should be applied carefully in order to avoid contaminating signi? A rolling boil provides agitation.
Before electroplating, cold cleaning with solvents must be followed by additional cleaning such as alkaline cleaning to remove slight oily residues. Part III -Final electrocleaning, to remove trace solids and especially adherent impurities.
Air agitation in rinses is bene?
A caked cleaner dissolves slowly. 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.
In cathodic cleaning, little or no tarnish or attach of asttm metal occurs. If steam coils are used, check for leaks diluting the solution.
ASTM B322 – 99(2014)
Parts going immediately to electroplating should be free from any objectionable? Descale the machine, if necessary, with inhibited hydrochloric acid or a proprietary descaling chemical to improve heating efficiency. However, this action may be bene? Obviously, economics atsm be considered but an initial or per pound cost must be balanced against other factors. To obtain true costs per thousand square feet of work processed all these factors must be included. Because most experience and knowledge in cleaning have been obtained by suppliers of proprietary processes and formulations, sstm sources should be consulted before setting up a cleaning process.
The cleaner should be buffered to have a high tolerance for acidic soils. Ashm alloys are rapidly attacked and nickel and silver surfaces become passivated, requiring special activating treatments for subsequent electrodeposits. Astm b IV —Trouble shooting. B32 some cases, cleaner formulation may be such as to make lower temperatures optimal.
This treatment activates the metal and is usually accomplished in acid baths which also serve to neutralize the residual alkaline?
Diluted emulsion cleaners usually have? The organic surface-active agents chosen should not be decomposed into tarry residues by heat, high alkalinity, or oxidation at anodes.
ASTM B – 99() Standard Guide for Cleaning Metals Prior to Electroplating
Methods of removal of heat-treat or mill scale are not included in thes Because most astm b and knowledge in cleaning have been obtained by suppliers of proprietary processes and formulations, these sources should be consulted astm b setting up a cleaning process. 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.
If the same trouble is evident on these parts, it can usually be concluded that the trouble is in the electroplating baths or elsewhere and not in the preparatory part of the cycle. In like manner, the recommendations for their application vary widely. 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 and solvent recovery.
Good lighting is required for accurate observation, and also, the observer should be one who knows from experience how correctly cleaned parts should look after each cleaning step. Usually, even with light soils, it is advisable to retain multistage cleaning, thereby increasing the life and efficiency of the cleaning solutions. Sometimes a change in soils may require a change in cleaners or a change in the method of cleaning.
Additions of rust inhibitors or of alkali cleaners can be made to the water phase.
ASTM-B | Standard Guide for Cleaning Metals Prior to Electroplating | Document Center, Inc.
Boiler condensate may also be used advantageously. This is true of electrocleaners as well as soak or spray cleaners.
The choice of these procedures must be based on a knowledge of the metals to be cleaned and of the soils to be removed. NOTE 2—Floating oil on water can cause poor adhesion.