淡水冷却水系の水処理改善と熱交換器の長寿命効果(<特集>腐食防食)

概要

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To prevent corrosion by MIC(Microbiologically Influenced Corrosion)of the heat exchanger's carbon steel tubes in Mitsui Chemicals Osaka Works(MCI Osaka), we improved the cooling water recirculating system. Furthermore we have studied the ability of several kinds of inhibitors used in our water cooling systm. To reduce MIC potential, we have changed the sterilizing method from the intermittent addition of bactericide(NaClO)to the continuous addition. As a result, life of the heat exchangers were prolonged more than two times. Additionally, we have studied the ion selective property of synthetic iron rust membranes(β-FeOOH)adsorbed the inhibitor, such as OP(OrthoPhosphoric acid), PBTC(2-PhosphonoButane-1, 2, 4-TriCarboxylic acid), HEDP(HydorxyEthilidence-1, 1-DiPhosphonic acid), PAA(PolyAcrylc Acid)and so on. Cation selectivity was increased in the order : OP<PAA<HEDP<PBTS. From this fact, it was found that HEDP and PBTC is more effective for corrosion prevention compared to PAA and OP. Iron rust adsorbed the inhibitors containing HEDP or PBTC has ability of preventing corrosive anion like chloride ion from penetrating it into metal surface.
社団法人日本材料学会の論文
2000-11-15