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OALib Journal期刊
ISSN: 2333-9721
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AH32耐蚀钢显微组织对其腐蚀行为的影响
DOI: 10.3724/SP.J.1037.2012.00105, PP. 534-540
Keywords: AH32耐蚀钢,浸泡实验,显微组织,腐蚀行为
Abstract:
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.
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