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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.
The corrosion resistance of continuous columnar crystal structure BFe10-1-1 alloy in 3.5% NaCl solution was studied by means of linear polarization and electrochemical impedance spectroscopy. The corrosion resistance of BFe10-1-1 alloy with ordinary cast polycrystalline structure BFe10-1 -1 alloy.The results of polarization curves show that the two alloys have similar electrochemical behaviors and the polarization curves include the active dissolution zone, activation-passivation transition zone and limiting current zone, but the continuous columnar crystalline alloy The corrosion rate is lower than ordinary cast polycrystalline alloy, which is mainly due to the small degree of micro segregation of the continuous columnar crystal structure BFe10-1-1 alloy, which can effectively prevent the local corrosion between dendrites.The electrochemical impedance spectroscopy test results also show that, The alloy’s charge transfer resistance and corrosion product film resistance are greater than ordinary cast polycrystalline alloy, with higher corrosion resistance.