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利用真空感应炉冶炼了不含硼和硼质量分数为16×10-6、26×10-6的3组1Cr17铁素体不锈钢,经锻造退火后,采用化学浸泡法及电化学试验方法(塔菲尔极化曲线法、阳极循环极化曲线法)研究了3种不锈钢在H2SO4介质中的耐蚀性能.结果表明:随着硼含量的增加,1Cr17不锈钢在5%微沸腾硫酸介质中的腐蚀速率显著降低,耐点蚀性能增加,耐晶间腐蚀性能降低;加入微量硼提高了1Cr17铁素体不锈钢在活性溶解区的耐均匀腐蚀能力,使得不锈钢更容易进入钝态,并且提高了不锈钢在钝态时的稳定性.腐蚀的电化学特征与其浸泡腐蚀的结果是吻合的.
Three sets of 1Cr17 ferritic stainless steel without boron and with boron content of 16 × 10-6 and 26 × 10-6 were smelted by vacuum induction furnace. After forging and annealing, chemical immersion method and electrochemical test method The corrosion resistance of three kinds of stainless steel in H2SO4 was studied by means of the polarization curve method and the cyclic polarization curve of the anode.The results show that with the increase of boron content, the corrosion of 1Cr17 stainless steel in 5% The rate of corrosion is significantly reduced, the pitting corrosion resistance is increased, and the intergranular corrosion resistance is reduced. The addition of trace boron improves the uniform corrosion resistance of the 1Cr17 ferritic stainless steel in the active dissolution zone, which makes the stainless steel more easily enter the passive state and improves the corrosion resistance of the stainless steel Stability at Passivation The electrochemical characteristics of corrosion are in agreement with the results of its immersion corrosion.