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通过电化学动电位极化方法研究了2Cr13不锈钢在含饱和CO2盐溶液中的缝隙腐蚀行为。考察了温度、NaCl浓度以及HAc浓度对缝隙腐蚀的影响规律,结果表明:2Cr13钢缝隙腐蚀击破电位低于点蚀击破电位,同条件下更易引发缝隙腐蚀,且随温度、NaCl浓度、HAc浓度升高,缝隙腐蚀击破电位逐渐下降,缝隙腐蚀诱发阻力减小,缝隙腐蚀倾向增大,2Cr13钢耐缝隙腐蚀性能降低。在该介质中,腐蚀发生时,缝隙部位作为阳极加速腐蚀,缝隙外部作为阴极而得到保护。
The crevice corrosion behavior of 2Cr13 stainless steel in saturated CO2 salt solution was studied by electrochemical potentiodynamic polarization. The effects of temperature, NaCl concentration and HAc concentration on crevice corrosion were investigated. The results showed that the crevice corrosion potential of 2Cr13 steel was lower than that of pitting rupture, and crevice corrosion was more likely to occur under the same conditions. With the increase of temperature, NaCl concentration and HAc concentration High, crevice corrosion potential gradually decay, crevice corrosion resistance decreases, crevice corrosion tendency increases, 2Cr13 steel crevice corrosion resistance decreases. In this medium, when corrosion occurs, the crack site accelerates corrosion as an anode and the outside of the crack as a cathode is protected.