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通过极化曲线、交流阻抗谱以及扫描电镜(SEM)等方法,研究了在不同的热处理工艺下5Cr5MoSiV1钢在中性环境和酸性环境中的耐腐蚀性,并且对其腐蚀机制进行了研究。SEM结果表明,在3.5%的NaCl溶液和0.05 mol/L的H2SO4溶液中5Cr5MoSiV1钢的腐蚀方式分别为点蚀和晶间腐蚀。电化学试验后,发现经过1 050℃淬火+空冷的热处理后试样自腐蚀电流密度较小,耐腐蚀性较好。其原因是基体中固溶的Cr元素较多,从而提高了5Cr5MoSiV1钢表面保护膜的致密性,有效提高了其耐腐蚀性。
The corrosion resistance of 5Cr5MoSiV1 steel in neutral and acidic environments under different heat treatments was investigated by means of polarization curves, AC impedance spectroscopy and scanning electron microscopy (SEM). The corrosion mechanism was also studied. SEM results showed that the corrosion modes of 5Cr5MoSiV1 steel in 3.5% NaCl solution and 0.05 mol / L H2SO4 solution were pitting corrosion and intergranular corrosion respectively. After electrochemical test, it is found that after 1050 ℃ quenching + air cooling, the self-corrosion current density of the sample is smaller and the corrosion resistance is better. The reason for this is that more Cr element is dissolved in the matrix, thereby increasing the compactness of the surface protective film of the steel 5Cr5MoSiV1 and effectively improving the corrosion resistance thereof.