Currently

there is no standard for water quality control for circulating water in indirect air cooling system of surface condenser aluminum heat exchanger(SCAL). Additionally

study on the influence of water quality on the corrosion of materials in this system was scarce. To solve this problem

according to the characteristics of water quality of circulating water in this system

the influence of trace SO_4~(2–)

Cl~– and pH value on corrosion process of the carton steel and pure aluminum were experimentally investigated in laboratory. The results indicate that

trace SO_4~(2–) and Cl~– in the water(≤1 mg/L) could accelerate the corrosion process of the carbon steel. The SO_4~(2–) could be self-catalyzed during this process. Therefore

the harm of SO_4~(2–) was much larger than that of the Cl– with the same concentration. Furthermore

SO_4~(2–) could also reduce the corrosion of the pure aluminum

and the corrosion rate of aluminum increased with the pH value.