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用周浸加速腐蚀试验、力学性能试验并结合扫描电镜、能谱分析以及透射电镜等方法对比研究了2种满足E690要求的低碳贝氏体钢(3种热处理方式)在模拟海洋大气环境中(0.5 wt%NaCl水溶液)的耐腐蚀性能和拉伸性能的变化。结果表明,在腐蚀初期晶粒越小越容易被腐蚀,成膜更快,有利于锈层的形成;Cu的析出会加速钢的初期腐蚀,在腐蚀后期形成致密锈层后这种影响变小。3种实验钢的腐蚀产物相组成差别不大,但锈层致密程度存在差异,并且锈层越致密,对应的钢的腐蚀速率越低。在试验环境中腐蚀对2种试验钢和3种处理方式的力学性能影响较小,说明没有产生严重的局部腐蚀。
Two kinds of low carbon bainitic steels (three kinds of heat treatment methods) which meet the requirements of E690 were comparatively studied in the simulation of marine atmosphere by using accelerated immersion corrosion test, mechanical property test and scanning electron microscope, energy spectrum analysis and transmission electron microscopy. (0.5 wt% NaCl aqueous solution) of the corrosion resistance and tensile properties of the change. The results show that the smaller the grain size is, the easier the corrosion is. The faster the film formation is, the easier the formation of the rust layer is. The precipitation of Cu accelerates the initial corrosion of steel, and the effect becomes smaller after the formation of the dense rust layer in the late stage of corrosion . The corrosion products of the three kinds of experimental steel have little difference in phase composition, but there is difference in the density of the rust layer, and the denser the rust layer, the lower the corrosion rate of the corresponding steel. Corrosion in the test environment had little effect on the mechanical properties of the two test steels and the three treatments, indicating no serious localized corrosion.