The Semiconductor And Electrochemistry Study Of Zinc Injection Technique Inhibition Metal Corrosion In Primary Water Of Pressurized Water Reactor

This paper reviewed the Water conditions in primary coolant of PWR nuclear power plant, determined that the material corrosion of pressure vessel, piping, steam generator in high temperature and high pressure water was an important factor of affect plant safety. The existence of oxide film had a great effect on metal corrosion resistance and played an important role in stable service and environmental failure. Zinc or sodium addition effects on corrosion resistance of 600 were investigated in simulated PWR primary coolant by dropping corrosion test and electrochemical impedance spectroscopy .The Mott-Schottky curves were measured to determine the semi-conductor properties characteristics of the surface passive film. The results showed that the film exhibited a duplex character, an n-type behavior had been correlated with the response of iron–oxides in outer oxide layers , while a p-type behavior had been attributed to the response of chromium-oxide in inner oxide layers. Calculated with the oxide film in the shallow \deep donor density and the flat band, and the thickness space charge layer, the results showed that zinc injection reduced donor and accepter density and flat band Potential, increased the space charge layer, reduce conductance rate. The 600 which is oxidized in high temperature aqueous solution contained zinc showed better corrosion resistance.