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中文摘要：
研究了X70管线钢缝隙在含Cl^-，SO4^2-溶液中阴极极化行为．实验结果表明：在-1000mV（CSE）口控电位下，随着缝隙开口尺寸增大，缝隙尖端越靠近缝口控电位；在同一缝隙开口尺寸时，随着缝口控电位的增大，缝隙内越容易达到保护状态．欠保护状态下，缝隙腐蚀会发生，缝隙内溶液pH值降低；保护状态下，缝隙内溶液pH值升高有碱化趋势．
英文摘要：
Cathodic polarization behavior of an X70 pipeline steel crevice in solution containing Cl^- and SO4^2- was studied. Experimental results show that at a protection potential of - 1 000 mV vs CSE, with increasing crevice size the potential of the crevice tip is close to the protection potential; at the same crevice size, with the increase of protection potential the status of protection is easily reached in the crevice. Under unprotection condition, crevice corrosion can happen and the pH value of solution reduces in the crevice; under protection condition, the pH of solution can rise and in the crevice the solution alkalized.
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