论文部分内容阅读
根据《油船货油舱耐蚀钢性能标准》规范,通过浸泡实验测量了AH32耐蚀钢在货油舱底部模拟环境中的腐蚀过程.采用失重测量、电化学极化与阻抗方法、扫描电镜和电子探针等手段,分析了AH32耐蚀钢显微组织对其腐蚀行为的影响.实验结果表明:模拟货油舱底板腐蚀实验中,AH32耐蚀钢的轧制面因珠光体所占面积分数小而腐蚀速率较低,其横截面则因珠光体面积分数大而造成腐蚀速度较快,而且二者的腐蚀速度均随浸泡时间的延长而加速.此外,轧制面表面有均匀腐蚀和因夹杂物溶解所形成的蚀坑,而横截面的腐蚀则沿条带状珠光体组织而有选择的进行.样品的珠光体区域在浸泡后有碳富集,这是造成腐蚀随浸泡时间延长而加速的原因.
The corrosion process of AH32 corrosion-resistant steel in simulated environment of bottom of cargo tank was measured by immersion test according to the specification of “Performance Standard of Corrosion Resistant Steel for Cargo Tank of Oil Tankers” .By means of weight loss measurement, electrochemical polarization and impedance method, SEM and Electron probe and other means to analyze the corrosion resistance of AH32 corrosion-resistant steel microstructure.The results show that: simulated cargo tank bottom corrosion test, AH32 corrosion-resistant steel rolling surface due to pearlite area fraction Small and the corrosion rate is low, the cross-section due to the large pearlite area caused by the corrosion rate faster, and both the corrosion rate are accelerated with the soaking time.In addition, the rolling surface with uniform corrosion and due to The inclusions dissolve the pits formed while the cross-sectional corrosion proceeds selectively along the ribbon-shaped pearlite.The pearlite area of the sample has carbon enrichment after soaking, which is the result of corrosion with increasing immersion time The reason for acceleration.