为研究缝隙腐蚀的溶液化学和缝中金属阳极极化行为，设计一种楔形缝隙模拟装置．以碳钢为研究对象，分别测试了在３．５％（ｗｔ）ＮａＣｌ溶液中缝内各位置的电极电位、Ｃｌ－浓度、ｐＨ值以及缝外阳极极化时电流密度的变化．结果表明：非极化状态下，距离缝口约２ｃｍ处的金属电位最负，最容易被腐蚀．缝外阳极极化促进缝隙腐蚀，并使得缝内溶液Ｃｌ－和Ｈ＋富集更严重；缝口金属受极化影响，腐蚀加剧，而缝隙深处却由于沉积盐膜作用而受到保护 In order to study the solution chemistry of crevice corrosion and the polarization behavior of the metal anodes in the slit, a wedge-shaped gap simulation device was designed. Taking carbon steel as the research object, the changes of electrode potential, Cl- concentration, pH value and current densities at the anode anodic polarization in 3.5% NaCl solution were tested respectively. The results show that in the non-polarized state, the metal potential at the position about 2 cm away from the seam is the most negative and most likely to be corroded. The anodic polarization of the outer part promotes the crevice corrosion and makes the concentration of Cl- and H + in the crevice more serious. The crevice metal is affected by the polarization and the corrosion is aggravated, but the deep part of the crevice is protected by the salt film deposition