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2种1180 MPa级超高强钢在3.5%NaCl溶液中的腐蚀行为,为后续超高强钢的研究提供参考。电化学测试结果均表明,2种1180 MPa级超高强钢在3.5%NaCl溶液中,DP1180钢的耐蚀性能更好,TWIP1180钢腐蚀倾向明显,耐腐蚀能力较差。从腐蚀后EDS结果中分析,TWIP1180钢在3.5%NaCl溶液中发生腐蚀后的腐蚀产物中出现大量氧化物(可能出现Mn及Fe的氧化物),从腐蚀产物可推断,TWIP1180钢腐蚀主要是吸氧腐蚀。分析认为TWIP1180钢耐蚀性能较差的主要原因是其成分中Mn含量较高,Mn在3.5%NaCl溶液中比Fe更具电化学活性,Mn易溶解生成Mn^(2+)离子,在Cl^(-)的侵蚀作用下,TWIP1180钢表面局部位置发生点蚀。
The corrosion behavior of two 1180 MPa ultra-high strength steels in 3.5%NaCl solution was studied by electrochemical tests such as scanning electron microscopy(SEM),polarization curves and impedance testing,providing a reference for subsequent research on ultra-high strength steels.Electrochemical test results show that in 3.5%NaCl solution,DP1180 steel has better corrosion resistance,and TWIP1180 steel has obvious corrosion tendency and poor corrosion resistance.Analysis from the EDS results after corrosion shows that a large number of oxides(oxides of Mn and Fe may appear)appear in the corrosion products of TWIP1180 steel after corrosion in 3.5%NaCl solution.It can be inferred from the corrosion products that the corrosion of TWIP1180 steel is mainly oxygen-absorbing corrosion.It is believed that the main reason for the poor corrosion resistance of TWIP1180 steel is the high content of Mn in its composition.Mn is more electrochemically active than Fe in 3.5%NaCl solution.Mn is easily dissolved to form Mn^(2+)ions.Under the erosion of Cl^(-),pitting pits occur in local locations on the surface of TWIP1180 steel.
出处
《科技创新与应用》
2025年第4期61-64,共4页
Technology Innovation and Application
基金
辽宁省教育厅2021年度科学研究经费项目(LJKZ1281)。
