东南大学学报（自然科学版）Issue(1)：152-159,8.DOI:10.3969/j.issn.1001-0505.2016.01.025
Cr8 Ni2合金耐蚀钢筋在不同 pH 值模拟混凝土孔溶液中的钝化行为
Passive behaviour of Cr8 Ni2 alloy corrosion-resistant steel in simulating concrete pore solutions with different pH values
摘要
Abstract
The passive behaviour of Cr8Ni2 alloy corrosion-resistant steel which was immersed in sim-ulating concrete pore solutions with different pH values (13.5 to 9.0) was investigated by various electrochemical techniques including potentiodynamic polarization, electrochemical impedance spec-troscopy and capacitance measurements.The results show that the passivity of the alloy corrosion-re-sistant steel enhances gradually with the increase of the immersion time, and tends to stability when immersed for 3 days with the same pH values.The passivity is not declined but increases significantly with decrease of pH values, indicating excellent passive performance of the alloy corrosion-resistant steel at lower pH values.The chemical composition of passive films was investigated using XPS ( X-ray Photoelectron Spectroscopy).The analytical results show that the passive film formed on the alloy corrosion-resistant steel presents a bilayer structure composed of Cr and Fe oxides/hydroxides.The out layer contains mainly Fe3O4, Fe2O3 and FeOOH (Fe(OH)3 ), and the inner layer has Cr2O3 and CrOOH(Cr(OH)3 ).The films on the alloy corrosion-resistant steel become enriched obviously in Cr oxides while depleted in Fe species as pH values dropping.High chromium oxides provide the films favourable stability and superior corrosion resistance, strengthening the passivity of the alloy corrosion-resistant steel at lower pH values.关键词
合金耐蚀钢筋/pH值/钝化行为/钝化膜Key words
alloy corrosion resistant steel/pH values/passive behaviour/passive film分类
化学化工引用本文复制引用
艾志勇,蒋金洋,孙伟,麻晗,张建春,宋丹,王丹芊..Cr8 Ni2合金耐蚀钢筋在不同 pH 值模拟混凝土孔溶液中的钝化行为[J].东南大学学报（自然科学版）,2016,(1):152-159,8.基金项目
国家自然科学基金资助项目（51278098）、国家重点基础研究发展计划（973计划）资助项目（2015CB655100）、江苏省产学研联合创新资金资助项目（BY2013091）． （）
