A Statistic Study of X70 Steel Corrsion in Sodium Chloride Contaminated Soil

In order to study the correlativity between steel corrosion rate and main parameters of sodium chloride contaminated soil, a series of indoor tests were conducted in polluted soils with different contents of sodium chloride and the X70 steel samples were buried in those soils. Based on the statistical analysis parameters of the polluted soils, the soil resistivity value decreased with the increase of sodium chloride content, and value of polluted soil was smaller than that of un-polluted soil. The steel corrosion rate increased with the increased of the content of sodium chloride, while decreased with time. At the same time, the parameters of corrosive dynamic equation were calculated and a corrosion coefficient of steel in sodium chloride contaminated soil was put forward. At last, based on the correlativity between steel corrosion rate and main parameters of sodium chloride polluted soil, a multiple regression equation about corrosive rate was established, which had two independent variables, resistivity and saturation.