Find in Library

In order to explore the corrosion behavior of the surface of carbon steel equipment substrate caused by the cooling water in hydropower plants, corrosion coupon method, surface analysis and electrochemical measurement technology were used to study the corrosion laws and corrosion mechanisms of Q235 carbon steel sheets immersed in cooling water of hydropower plants. Results showed that the Mg2+ and Ca2+ in the cooling water accelerated the corrosion process of carbon steel. The kinetic simulation calculation was used to study the factors inducing the reaction and it was found that with the presence of Mg2+ and Ca2+, the mean square displacement and the diffusion coefficient of the corrosion product film both increased to a certain extent, and the corrosion ions were adsorbed by means of forming chemical bonds with the corrosion product film surface, thus obtaining a large adsorption energy. So it was concluded that the increase of Cl- content would aggravate the corrosion of carbon steel equipment in hydropower plants, and the coexistence of Cl, Mg, and Ca elements in cooling water was the reason for the increasing corrosion rate of carbon steel equipment.