cleaning, pretreatment & surface preparation

METAL CLEANING

BY ROBERT FARRELL AND EDMUND HORNER

HUBBARD-HALL INC., WATERBURY, CONN.; WWW.HUBBARDHALL.COM

Simply stated, the function performed in metal cleaning is removal of material,collected in the previous operations, from the metal’s surface to prepareit for subsequent operations.Cleaning metals involves not only the selection of the type(s) of cleaners,

but also the proper cleaning cycle and process equipment necessary to generateacceptable parts at a given rate (parts/hour).

An equation for such a cleaning operation may be illustrated as follows:Process Equipment + Process Cycle + Cleaner(s) = Acceptable Parts/HourEach of the terms in the equation shares the burden in providing acceptableparts at a given rate for an economical operation. The equation also notes thatin certain operations more than one cleaner may be required, as per a line forelectroplating.

Process equipment is the equipment selected—rack line, barrel line, spiralwasher, ultrasonic...

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