The factors affecting the corrosion of condensor copper tubes in ammonia and the relevant rules were investigated. Thus the
HAl77-2A copper tube samples were soaked in ammonia solutions of different ammonia
concentrations (500～20 000 mg/L) and different dissolved O_2 concentrations (open and close state) at room temperature for 45 d, and the variation in the dissolved oxygen of the ammonia solution was measured. At the same time, the corrosion rate of the copper tube samples was determined by corrosion mass loss measuring and atomic absorption spectroscopic analysis. Moreover, the influence of temperature on the corrosion behavior of the copper tube samples was investigated at different temperatures (20～45 ℃), different dissolved O_2 concentrations (open and close state), and different ammonia concentrations as well. It was found that the copper tube samples had a slight corrosion at an ammonia concentration below 800 mg/L. The corrosion rate of the copper tube samples significantly increased with increasing ammonia concentration within 800～1 000 mg/L and with increasing temperature at a fixed ammonia concentration as well. Besides, they recorded a larger corrosion rate in open system than in closed system. The corrosion behavior of the condenser copper tube was largely dependent on the concentrations of the dissolved O_2 and ammonia. The corrosion rate increased with increasing concentration of the ammonia and dissolved oxygen and water temperature as well. Moreover, the corrosion rate determined by corrosion mass loss was similar to that determined by
atomic absorption spectroscopy.