中文摘要：

采用线性极化、电化学阻抗谱等电化学方法研究了连续柱状晶组织BFe10-1-1合金在3.5%（质量分数）NaCl溶液中的耐蚀性能,并与普通铸造多晶组织BFe10-1-1合金进行了对比.极化曲线测试结果表明,两种合金具有相似的电化学行为,极化曲线都包括活性溶解区、活化-钝化转变区和极限电流区,但连续柱状晶组织合金腐蚀速率小于普通铸造多晶组织合金,主要是由于连续柱状晶组织BFe10-1-1合金的微观偏析程度较小,能有效避免枝晶间局部腐蚀的发生.电化学阻抗谱测试结果也表明,该合金的电荷传递电阻和腐蚀产物膜电阻均大于普通铸造多晶组织合金,具有更高的耐蚀性.

英文摘要：

The corrosion resistance of BFe10-1-1 alloy with continuous columnar-grained microstructure in a 3.5% NaCl solution was investigated by means of polarization tests and electrochemical impedance spectroscopy（EIS）,and compared with that of BFe10-1-1 alloy with conventional polycrystalline microstructure fabricated by conventional casting.Polarization test results show that both BFe10-1-1 alloys have similar electrochemical behavior,and their polarization curves include three distinct regions,that is,the active dissolution region,the active-passive transition region and the limiting current region.However the corrosion rate of BFe10-1-1 alloy with continuous columnar-grained microstructure is lower than that of the one with conventional polycrystalline microstructure,as less microsegregation in BFe10-1-1 alloy with continuous columnar-grained microstructure can effectively avoid interdendritic corrosion.EIS spectra indicate that BFe10-1-1 alloy with continuous columnar-grained microstructure has a higher charge transfer resistance and a higher corrosion product film resistance compared with BFe10-1-1 alloy with conventional polycrystalline microstructure.The results further demonstrate that BFe10-1-1 alloy with continuous columnar-grained microstructure has a better corrosion resistance.