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Materials 2017, 10(4), 412; doi:10.3390/ma10040412

The Passive Film Growth Mechanism of New Corrosion-Resistant Steel Rebar in Simulated Concrete Pore Solution: Nanometer Structure and Electrochemical Study

1,2,* , 1,2
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3
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1
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2
Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China
3
Research Institute of Jiangsu ShaSteel Iron and Steel, Zhangjiagang 215625, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yong-Cheng Lin
Received: 3 March 2017 / Revised: 7 April 2017 / Accepted: 11 April 2017 / Published: 14 April 2017
View Full-Text   |   Download PDF [14819 KB, uploaded 14 April 2017]   |  

Abstract

An elaborative study was carried out on the growth mechanism and properties of the passive film for a new kind of alloyed corrosion-resistant steel (CR steel). The passive film naturally formed in simulated concrete pore solutions (pH = 13.3). The corrosion resistance was evaluated by various methods including open circuit potential (OCP), linear polarization resistance (LPR) measurements, and electrochemical impedance spectroscopy (EIS). Meanwhile, the 2205 duplex stainless steel (SS steel) was evaluated for comparison. Moreover, the passive film with CR steel was studied by means of X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Atomic Force Microscope (AFM), and the Mott‑Schottky approach. The results showed that the excellent passivity of CR steel could be detected in a high alkaline environment. The grain boundaries between the fine passive film particles lead to increasing Cr oxide content in the later passivation stage. The filling of cation vacancies in the later passivation stage as well as the orderly crystalized inner layer contributed to the excellent corrosion resistance of CR steel. A passive film growth model for CR steel was proposed. View Full-Text
Keywords: corrosion-resistant steel rebar; passive film; TEM corrosion-resistant steel rebar; passive film; TEM
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Jiang, J.-Y.; Wang, D.; Chu, H.-Y.; Ma, H.; Liu, Y.; Gao, Y.; Shi, J.; Sun, W. The Passive Film Growth Mechanism of New Corrosion-Resistant Steel Rebar in Simulated Concrete Pore Solution: Nanometer Structure and Electrochemical Study. Materials 2017, 10, 412.

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