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通过常温电化学实验和高温挂片实验,研究了模拟给水弱氧化性全挥发处理AVT(O)溶液中SO2-4含量对T23钢腐蚀行为的影响,并采用电化学动电位扫描、交流阻抗技术、电子扫描显微(SEM)及X射线衍射技术(XRD)进行分析和表征。研究结果表明,SO2-4和OH-在金属表面存在竞争吸附,阻碍了OH-对金属的钝化作用,促进了金属的点蚀;常温条件下,SO2-4为侵蚀性阴离子,随着SO2-4浓度的增加,T23的点蚀诱发敏感性升高,T23电极的Ecorr降低,Icorr升高,腐蚀加剧;高温条件下,随着SO2-4浓度的增加,材料腐蚀加剧,但不引起材料表面钝化膜成份的改变。
The effects of SO2-4 content on the corrosion behavior of T23 steel in AVT (O) solution of simulated weakly oxidizing water were studied by means of room temperature electrochemical experiments and high temperature coupons experiments. The electrochemical kinetic potential scanning and AC impedance techniques , Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis and characterization. The results show that SO2-4 and OH- have competitive adsorption on the metal surface, which hinders the deactivation of OH- and promotes the pitting corrosion of metal. Under ambient temperature, SO2-4 is an aggressive anion. With the increase of SO2 -4 increased, the sensitivity of pitting induced by T23 increased, the Ecorr decreased, Icorr increased and the corrosion increased at T23 electrode. Under the condition of high SO2-4 concentration, the material corrosion increased, but the material did not cause Surface passivation film changes in the composition.