Passivation and electrochemical behavior of 316L stainless steel in chlorinated simulated concrete pore solution

•The pH value play an important role on passive mechanism of stainless steel.•The relationship between Cr/Fe ratio within the passive film and pH is non-linear.•Better corrosion resistance due to high Cr/Fe ratio and molybdates ions. In this paper, the passivation and electrochemical behavior of 316...

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Bibliographic Details
Published in:Applied surface science 2017-04, Vol.400, p.38-48
Main Authors: Luo, Hong, Su, Huaizhi, Dong, Chaofang, Li, Xiaogang
Format: Article
Language:English
Subjects:
Concrete
Passive film
Pitting
Stainless steel
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Summary:•The pH value play an important role on passive mechanism of stainless steel.•The relationship between Cr/Fe ratio within the passive film and pH is non-linear.•Better corrosion resistance due to high Cr/Fe ratio and molybdates ions. In this paper, the passivation and electrochemical behavior of 316L stainless steel in chlorinated simulated concrete pore solutions at different pH was evaluated by potentiodynamic measurements, electrochemical impedance spectroscopy. The composition of the passive film and surface morphology were investigated by X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), and scanning electron microscopy, respectively. The results reveal that metastable pitting susceptibility, stable pitting corrosion, and composition of the passive film are influenced by pH value. After long time immersion, a bilayer structure passive film can be formed in this environment. The appearance of molybdates on the outermost surface layer, further enhancing the stability of the passive film. Moreover, the good pitting corrosion resistance of 316L stainless steel in simulated concrete pore solution without carbonated is mainly due to the presence of high Cr/Fe ratio and molybdates ions within the passive film.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.12.180