利用周浸加速腐蚀实验与力学性能实验对比研究了新型低碳贝氏体钢、超低碳铁素 体钢以及09CuPCrNi钢这3种钢在含氯离子环境中的耐腐蚀性能与拉伸性能的变化. 与超低 碳铁素体钢和09CuPCrNi钢相比, 新型低碳贝氏体钢不仅力学性能提高了, 而且耐腐蚀性 能亦得到改善, 其腐蚀速率明显低于其余2种对比钢, 并且随着腐蚀时间的延长其优势更加 明显. 3种钢的锈层具有相近的相组成, 但新型低碳贝氏体钢的腐蚀产物颗粒最细小且锈层 最致密, 同时在接近钢基体的锈层处Cr和Cu的富集程度最明显且Cl的含量最低. 新 型低碳贝氏体钢锈层阻碍氯离子透过能力高于其余2种对比钢锈层.
The corrosion resistance of one newly-developed low carbon bainitic steel, ultra-low carbon ferritic steel and 09CuPCrNi steel was researched in environment containing chloride ions through alternate wet-dry accelerated corrosion test. The bainitic steel possesses both excellent mechanical property and excellent corrosion resistance. The corrosion rate of the bainitic steel was obviously lower than that of the other two steels and the gap increased with corrosion time. The phase constituents of the rust layers of the three kinds of steel were similar, while corrosion products of the bainitic steel were finest and most compact. The enrichment of Cr and Cu in the rust layer near the matrix of the bainitic steel was most obvious, while the content of chloride was lowest in the same location. The ability of rust layer in the bainitic steel to block permeation of chloride ion was higher than that of the two other steel.
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