Metal Finishing Guide Book


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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. 152

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