Metal Finishing Guide Book


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Ancillary processes associated with your pretreatment line may also be affected by changing to the new technology. If you continue to treat your wastewater after implementing a TMC you need to consider the water treatment chemistry. The implementation of TMC changed how the coagulant worked. Figure 2 shows what happened to the right and how the sludge should look on the left. The result was that the sludge became dense and sticky making a mess in the clarifier and sludge thickening tank. WRAP UP Transitional metal conversions potentially can save you money while improving quality. I believe in the new technology. However, in the last two years I've seen lines converted in many ways from iron or zinc phosphate to TMC and some went back to phosphating. The common denominator for failed implementation is carry-over contamination and in-process rusting from slow transfer times. I have also seen TMCs replace with competitive TMC's. The reason for this transition is that the original product's capabilities were oversold. It is these situations that motivate my topic. In closing, do your research, make a plan and roll with the changes with open eyes. BIO Ken Kaluzny is the General Industrial Product Manager for Coral Chemical Company in Zion, Ill. He received a Bachelor of Arts degree in Chemistry from Knox College in 1982. Since then he has held various positions at Coral Chemical. Ken is a member of the Chemical Coaters Association International, the Electrocoat Association, Powder Coating Institute, and the Porcelain Enamel Institute. 139

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