What is the importance of the quality of water in a pretreatment process?
Water is arguably the most important component in the pretreatment process comprising greater than 95% of the pretreatment process chemistry. Surprisingly, few finishers give much thought to water’s contribution and ultimate cost in their pretreatment operation. Water’s primary role is to remove chemical/soil residue and contaminants from the work place. This permits the presentation of a contaminant free surface in order to promote optimum coating adhesion and performance. Clearly, water quality is of critical importance in order to achieve your customers implied or specified coating performance standards. Water quality is directly related to the impurities or contaminants that it contains. A major problem area in the pretreatment process is by high total dissolved solids (TDS) accumulating in the rinse water. Excessive TDS in he water are deposited on metal parts during rinsing. As the water evaporates these impurities remain on the metal substrate. Another method of measuring water
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