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通过金相显微镜、透射电镜以及极化曲线技术研究了回火温度和ε-Cu的析出和对一种含铜贝氏体钢耐蚀性的影响。试验结果表明,对于含铜量较低的试样(0.03%、0.50%),Cu含量对耐蚀性的影响不大,缺陷多少及内应力大小是决定试样耐蚀性的主要因素,他们是腐蚀孔的优先形成处。对于含铜量较高的试样(1.0%、1.5%、2.0%),淬火后存在基体中的大量固溶铜可提高试样的耐蚀性。试样在400℃回火后的耐蚀性最好,当回火温度太高时,ε-Cu颗粒粗化导致腐蚀电流增加,耐蚀性下降。
The effects of tempering temperature, ε-Cu precipitation and corrosion resistance on a copper-bearing bainitic steel were investigated by means of metallographic microscope, transmission electron microscopy and polarization curves. The test results show that the Cu content has little effect on the corrosion resistance of the samples with low Cu content (0.03%, 0.50%), the number of defects and the internal stress are the main factors that determine the corrosion resistance of the samples. Corroded holes are preferentially formed. For samples with high copper content (1.0%, 1.5%, 2.0%), the presence of a large amount of solid solution copper in the matrix after quenching can improve the corrosion resistance of the sample. The corrosion resistance of the sample after tempering at 400 ℃ is the best. When the tempering temperature is too high, the ε-Cu particle coarsening leads to the increase of corrosion current and the decrease of corrosion resistance.