Analysis of factors on soil corrosion for buried Q235 steel in Ku'erle region

Soil corrosion is one of important factors for the safety operation of buried steel pipeline. The main environment factors for corrosion of Q235 steel were determined by using fuzzy cluster, and the order and proportion of main factors affecting soil corrosion were investigated by grey relationship analysis and analytical hierarchy process methods. The results showed that the influence factors proportion for the soil corrosion of Q235 steel decreases in the following order: salt concent (0.4050) > soil conductivity (0.2517) > water content (0.1493) > Cl^- (0.0868) > pH value (0.0501) > SO₄² (0.0291) > HCO₃^- (0.0173) > NO₃^- (0.0107), the result provided some new reference data for establishing an evaluation method of soil corrosion of underground pipelines.