新型铁塔用钢腐蚀和力学性能研究

Study on Corrosion and Mechanical Properties of New Steel for Iron Tower

选用一种Q235B和三种合金元素不同的Q420B铁塔用钢,通过原子发射光谱仪进行化学成分分析。选择NaCl溶液为液体环境进行动电位极化和电化学阻抗测试腐蚀性能;化学浸泡试验,研究形貌和产物;拉伸试验分析力学性能。结果表明,3种Q420B钢腐蚀性能优于Q235B,因Si、Cr等元素含量不同,材料表面钝化膜的稳定性存在差异,导致腐蚀性能不同;元素V含量增加,优化力学性能;通过JMatPro软件模拟证明提升Mn含量,可促进组织稳定性并改善力学性能。

One Q235B and three Q420B tower steels with different alloy elements were selected for chemical composition analysis by atomic emission spectrometer.NaCl solution was selected as a liquid environment for action potential polarization and electrochemical impedance testing of corrosion properties,chemical immersion test to study the morphology and products,mechanical properties were analyzed by tensile test.The results showed that the corrosion performance of the three Q420B steels was better than that of Q235B,due to the different content of Si,Cr and other elements,the stability of passivated films on the surface of the materials was different,resulting in different corrosion properties,the content of element V was increased to optimize the mechanical properties,JMatPro software simulation proved that increasing Mn content could promote tissue stability and improve mechanical properties.