Journal
APPLIED SURFACE SCIENCE
Volume 400, Issue -, Pages 38-48Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.12.180
Keywords
Stainless steel; Passive film; Concrete; Pitting
Categories
Funding
- Natural Science Foundation of Jiangsu Province of China [BK20140849]
- National Natural Science Foundation of China [51401076]
- National Science and Technology Infrastructure Platforms Construction Project
- iangsu Innovation and Entrepreneurship (Shuangchuang) Program
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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. (C) 2016 Elsevier B.V. All rights reserved.
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