TWIP钢在3.5%NaCl溶液中腐蚀行为研究

Research on Corrosion Behavior of TWIP Steel in 3.5%NaCl Solution

摘要: 利用扫描电镜（SEM）、极化曲线及阻抗测试等电化学测试研究了两种TWIP钢在3.5% NaCl溶液中的腐蚀行为。结果表明：TWIP钢的组织主要为内部有大量孪晶的奥氏体组织。在3.5% NaCl溶液中，TWIP980钢与TWIP1180钢相比较，TWIP980钢的耐蚀性能更好，TWIP1180钢腐蚀倾向明显，耐腐蚀能力较差。TWIP1180钢耐腐蚀性能较差的主要原因在于TWIP1180钢中Mn含量较大，腐蚀倾向增加。并且TWIP980钢中Al含量大于TWIP1180钢，Al的存在会促进形成钝化膜，降低TWIP980钢在3.5% NaCl溶液中的腐蚀倾向性。

Abstract: The corrosion behavior of TWIP steels in 3.5%NaCl solution was studied by means of SEM, polarization curve and impedance measurement. The results show that the microstructure of TWIP steel is mainly austenite with a lot of twins.The corrosion resistance of TWIP980 steel is better than that of TWIP1180 steel in 3.5%NaCl solution. The corrosion tendency of TWIP1180 steel is obvious and its corrosion resistance is poor.The main reason for the poor corrosion resistance of TWIP1180 steel is that the content of Mn in TWIP1180 steel is high and the corrosion tendency is increased.The Al content of TWIP980 steel is higher than that of TWIP1180 steel. The existence of Al promotes the formation of passivation film and reduces the corrosion tendency of TWIP980 steel in 3.5%NaCl solution.