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设计了1Cr-0.5Al-0.3Mo,5Cr-0.4Ni-0.3Cu和10Cr-0.3Ni3种不同成分的实验钢,以20MnSi钢为对比钢种,采用周期浸润加速腐蚀实验、电化学测试方法,结合SEM和XRD等手段研究了实验钢种在模拟海洋大气环境中的腐蚀行为。结果表明:实验钢的腐蚀速率随Cr含量增加而降低,1Cr钢和5Cr钢锈层为双层结构,内锈层为富铬层与贫铬层交替带状结构,10Cr钢表面出现钝化现象;随着腐蚀时间延长,5Cr钢腐蚀率先增加后趋平稳,10Cr钢腐蚀率一直稳定在较低水平,20MnSi钢腐蚀率降低;Cr可提高基体自腐蚀电位和电荷传递电阻,同时增大锈层电阻。
The experimental steels with different composition of 1Cr-0.5Al-0.3Mo, 5Cr-0.4Ni-0.3Cu and 10Cr-0.3Ni were designed and 20MnSi steels were used as the comparative steels. The cyclic infiltration accelerated corrosion test, electrochemical test method, SEM and XRD were used to study the corrosion behavior of experimental steels in simulated marine atmosphere. The results show that the corrosion rate of experimental steel decreases with the increase of Cr content. The rust layer of 1Cr steel and 5Cr steel is double-layer structure. The internal rust layer is an alternating ribbon structure of chromium-rich layer and chromium-depleted layer. Passivation phenomenon appears on the surface of 10Cr steel ; With the increase of corrosion time, the corrosion rate of 5Cr steel first increases and then becomes stable. The corrosion rate of 10Cr steel has been kept at a relatively low level, and the corrosion rate of 20MnSi steel decreases. Cr increases the corrosion potential of the substrate and charge transfer resistance, resistance.