Abstract
A copper cooling jacket is the major component in water cooling system for electronic equipment. Corrosion of this jacket is mainly induced by corrosive dissolved ions from other components made of organic materials. We investigated both an ion exchange system with ion exchanger and an inhibitor system using a benzotriazole (BTA) solution as methods of controlling cooling water. A life estimation method for the ion exchange system was established considering decrease in ion exchange capacity of ion exchange resin and dissolution of corrosive ions. The cooling system examined in this study should be able to replace the ion exchange resin for at least four years. A life estimation method of the inhibitor system was established considering decrease of BTA concentration and effective BTA concentration controlling copper corrosion. This cooling system should be able to provide the BTA inhibitor for at least three years. To achieve a new cooling system for controlling cooling water for ten years, we proposed an ion exchange and inhibitor multiplex system. As BTA adsorbed on ion-exchange resin dissolves gradually in the cooling water, BTA can be maintained at above an effective concentration controlling the copper corrosion for 10 years. Furthermore, by using ion exchange resin adsorbed BTA, an ion exchange and inhibitor multiplex system can be achieved without structural modification of an existing ion exchange system.
