In situ corrosion control in industrial water systems

The main objective of this study was to evaluate the efficacy of a biocide and a corrosion inhibitor against the corrosion of a circulating pipe in a cooling tower. Isothiazolone was tested as the industrial biocide. The resu lts showed that the biocide by itself or combined with a dispersant was not efficient to control corrosion in the industrial system. Corrosion rates o f 0.324 mm/year were recorded in both the presence and absence of the bioci de. Corrosion control was successfully accomplished by using a corrosion in hibitor. In the latter case the maximum corrosion rate of 0.024 mm/year wer e obtained.