利用动电位极化曲线和交流阻抗谱等电化学测量技术研究了Q235钢表面原位生长的α-FeOOH膜在0.25 mol/L Na2SO4+10-4 mol/L NaCl、0.25 mol/L Na2SO4+10-3 mol/L NaCl、0.25 mol/L Na2SO4+10-2 mol/L NaCl水溶液中的电化学性能.在不同浓度的Cl-溶液中α-FeOOH膜对侵蚀性离子的作用机制.结果表明，Q235钢表面原位生长的α-FeOOH膜在10-4 mol/L 到10-2 mol/LCl-浓度范围内，对基材均无保护作用；但当Cl-含量为10-2 mol/L时，α-FeOOH膜的膜电阻及转移电阻皆比低氯离子浓度的要大，此时α-FeOOH膜表现出一定的抗腐蚀能力.
In this paper,the electrochemical characteristics of an in-situ formed α-FeOOH film on Q235 steel have been investigated by means of potentiodynamic polarization and EIS measurements in several Cl- containing solutions such as 0.25 mol/LNa2SO4+10-4 mol/LNaCl, 0.25 mol/LNa2SO4+10-3 mol/LNaCl and 0.25 mol/LNa2SO4+10-2 mol/L NaCl.The results indicate that the α-FeOOH film formed in situ on Q235 provides no protectiveness to the steel substrate in a solution with 10-4 mol/L Cl-.When the Cl- concentration reached to 10-2 mol/L, the Rfilm and Rt of the in-situ formed α-FeOOH film on Q235 were larger than those in solutions with lower Cl- concentration,in such case the film shows protectiveness to the substrate steel to some extent.
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