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中文摘要：
利用模拟楔型缝隙构型研究了XTO钢在低浓度NaHCO3溶液中的缝隙腐蚀机理．结果表明：随实验时间的延长，缝内金属电位均不同程度的负移，缝隙底部试片的电位最负；缝内溶液pH值下降，溶解氧含量减少；缝外耦接试样时缝内金属腐蚀加剧，缝内溶液的pH值显著下降，微区氧含量略高于缝外无耦接试样时缝内的氧含量．缝隙内、外不同部位金属表面上阳极溶解电流密度与阴极还原电流密度的不平衡是产生缝隙闭塞自催化效应的根本原因；X70钢模拟缝隙在两种不同浓度HCO3^-溶液中的腐蚀机理一致，但在较高浓度溶液中腐蚀程度要严重些．
英文摘要：
A detailed study on the crevice corrosion mechanism of X70 steel has been carried out by using a wedge-shaped crevice model. The results showed that the corrosion potential decreased differently within the crevice and there existed a maximum negative at the bottom side;Along with pH value reduced, the dissolved oxygen was nearly exhausted in the crevice. When the opening side of the coupons was coupled with each other the crevice corrosion in the crevice might be accelerated and the pH value gradually reduced, however, the oxygen was not completely exhausted. The unbalanced current density between anodic and cathode is the main cause of blocked self-catalysis effect in the crevice. The corrosion mechanism of the steel in the simulated crevice is identical in two different HCO3^- concentration solutions. But the corrosion was severer in high concentration HCO3^- solution.
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