Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 111 of 707

In summary local sewer authorities may dictate the type of treatment required for alkaline baths and how these baths are to be disposed. In all instances cost of disposal is normally far less costly than dealing with or disposing of solvents. EQUIPMENT SELECTION As stated previously end users have to define part geometry, productivity, mate- rial handling, and cleanliness specification. Once these are known tests can be con- ducted to determine which type of system and the type of mechanical interaction that is best suited to meet end users' needs. Although cost is always a consider- ation to determine the proper selection of the type of aqueous cleaning system to be used, capability should be the driving force in proper equipment selection. It is important that the system achieve cleanliness specifications at the produc- tion levels desired. Good interaction must be achieved between end user and the equipment supplier to ensure that any proposed system is equipped with adequate mechan- ical interaction to achieve the desired level of cleanliness, that there is adequate rinsing to ensure removal of residual chemistries with a minimal level of accept- able water usage, and that dryer design will achieve the level and quality of dry- ness desired. The equipment costs for aqueous systems normally are higher than solvent sys- tems, but the operating costs are normally less. The purchase costs for aqueous chemistry and chemistry disposal is a small fraction of the purchase and disposal cost of solvent-based chemistries. In summary aqueous cleaning systems have come of age. They can more effectively clean to a higher cleanliness level than is achievable with solvent sys- tems. Aqueous systems leave no residue on parts. Aqueous systems are environmentally friendly, end-user friendly, and can consistently achieve desired results. Aqueous systems offer a cleaning solution and are considered environmentally compliant. With new EPA guidelines and restrictions you can be assured that aque- ous systems will become even more dominant in the 21st century. 110

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