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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effect of Heat Treatment on the Corrosion Resistance of 440C Stainless Steel in 20 percent HNO_3 + 2.5 percent Na_2Cr_2O_7 Solution
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The Effect of Heat Treatment on the Corrosion Resistance of 440C Stainless Steel in 20 percent HNO_3 + 2.5 percent Na_2Cr_2O_7 Solution

机译：热处理对440C不锈钢在20％HNO_3 + 2.5％Na_2Cr_2O_7溶液中的耐蚀性的影响

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摘要

The effect of heat treatment on the corrosion resistance of 440C stainless steel was investigated in a 20 percent HNO_3 + 2.5 percent Na_2Cr_2O_7 solution using electrochemical noise (ECN) measurements, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) examinations. The noise resistance (Rn), which has been found to be inversely related to the localized corrosion rate, was measured to be 5.7E + 08 OMEGA-cm~2, 4.2E + 08 OMEGA -cm~2, and 3.7E + 04 OMEGA-cm~2 for the oil-quenched, air-quenched, and vacuum furnace cooled (VFC) samples, respectively, after 1200 5 exposures. The Rn for all heat treat conditions stabilized within a range of 1.0E + 07 OMEGA-cm~2 to 3.2E + 08 OMEGA -cm~2 after 2 h exposures. The EIS response showed a polarization resistance (Rp) on the order of 6.6E + 04 OMEGA -cm~2, 5.3E + 04 OMEGA -cm~2, and 1.1E + 04 OMEGA-cm~2 for the oil-quenched, air-quenched, and VFC samples, respectively, after 2 h exposures. The EIS data are in good agreement with ECN data and indicate that after longer exposures, general corrosion mechanisms dominate and the corrosion rates are comparable. SEM examinations of specimens subjected to 1200 s exposures revealed that severity of pitting and intergranular corrosion damage was consistent with trends in the Rn data. Specifically, the electrochemical noise data as well as SEM examinations of specimens revealed a higher localized corrosion resistance of the hardened specimens during the early stages of passivation. This greater resistance to localized corrosion can be attributed to an increased stability of the natural passive film resulting from a higher concentration of chromium atoms in solution for the martensite phase.
机译：在20％的HNO_3 + 2.5％的Na_2Cr_2O_7溶液中，采用电化学噪声（ECN）测量，电化学阻抗谱（EIS）和扫描电子显微镜（SEM）检查，研究了热处理对440C不锈钢耐腐蚀性的影响。测得的抗噪性（Rn）与局部腐蚀速率成反比，测量值为5.7E + 08 OMEGA-cm〜2、4.2E + 08 OMEGA-cm〜2和3.7E + 04 1200次暴露5次后，分别用于油淬火，空气淬火和真空炉冷却（VFC）的OMEGA-cm〜2。暴露2 h后，所有热处理条件的Rn稳定在1.0E + 07 OMEGA-cm〜2到3.2E + 08 OMEGA-cm〜2的范围内。对于油淬火，EIS响应显示出极化电阻（Rp）约为6.6E + 04 OMEGA -cm〜2、5.3E + 04 OMEGA -cm〜2和1.1E + 04 OMEGA-cm〜2，暴露2 h后分别进行空气淬火和VFC样品处理。 EIS数据与ECN数据非常吻合，表明长时间暴露后，一般的腐蚀机理占主导地位，腐蚀速率可比。受到1200 s暴露的样品的SEM检查显示，点蚀和晶间腐蚀损害的严重程度与Rn数据的趋势一致。具体而言，电化学噪声数据以及样品的SEM检查显示，在钝化的早期阶段，硬化后的样品具有更高的局部耐腐蚀性。这种对局部腐蚀的更大抵抗力可归因于天然钝化膜的更高稳定性，这是由于马氏体相溶液中铬原子的浓度更高。

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