INFLUENCE OF IN-SITU FORMED IRON OXIDE FILM ON Q235 LOW CARBON STEEL ON ITS CORROSION PERFORMANCE IN CI- CONTAINING SOLUTIONS II-A STUDY OF IN-SITU FORMED α-FeOOH FILM
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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