Grey Relational Space Analysis of Effect of Environmental Factors on Corrosion Resistance of X70 Pipeline Steel in Yingtan Soil Simulated Solution

The reliability of Yingtan soil simulated solution was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization curves.The effect of environmental factors,including dissolved oxygen,temperature,conductivity and pH,on the corrosion resistance of X70 pipeline steel in Yingtan soil simulated solution was evaluated using grey relational space analysis.The Yingtan soil simulated solution showed a corrosion mechanism similar to water saturated Yingtan soil ,and the tests in the solution can reveal the soil characteristics.According to the grey relational space analysis,the degree of association between corrosion rate and environment factors decreased in the following order;solution conductivity ＞ dissolved oxygen ＞ temperature ＞ pH.