Galvanic Corrosion Study between Tensile-Stressed and Non-Stressed Carbon Steels in Simulated Concrete Pore Solution

Zheng Dong,Amir Poursaee,Chuanqing Fu

doi:10.3390/met12010098

Zheng Dong, Amir Poursaee + Show 1 more

Open Access

https://doi.org/10.3390/met12010098

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Journal: Metals	Publication Date: Jan 4, 2022
Citations: 5	License type: CC BY 4.0

Affiliation: Zhejiang University of Technology, Clemson University

Abstract

The present study investigated the galvanic effect between tensile-stressed and non-stressed carbon steels, in addition to the influence of the tensile stress on the passivation and corrosion behavior of steel in a simulated concrete pore solution. Three different levels of tensile stress, ranging from elastic to plastic stress on the surface, were applied by adjusting the displacement of C-shape carbon steel rings. Different electrochemical measurements including the open circuit potential (OCP), the electrochemical impedance spectroscopy (EIS), the zero-resistance ammetry (ZRA), and the cyclic polarization were performed. Based on the results of EIS, the tensile stress degraded the resistance of the oxide film in moderate frequencies while enhancing the charge transfer resistance in low frequencies during passivation. As corrosion propagated, the stressed steel yielded a similar charge transfer resistance to or an even lower charge transfer resistance than the non-stressed steel, especially in the case of plastic tensile stress. The galvanic effect between the tensile-stressed and non-stressed steels increased the chloride threshold value of the tensile-stressed steel, although the susceptibility to pitting corrosion was exhibited after being corroded.

Highlights

This study study investigated investigated the the galvanic galvanic corrosion corrosion between between tensile-stressed tensile-stressed and and nonnonThis stressed steels steels in in an an simulated concrete pore solution (SCPS), SCPS, in in addition addition to to the the influence influence of of tensile tensile stress stress on on the the passivation passivation stressed and corrosion behavior of steel, through electrochemical measurements
The following conclusions can be drawn: (1) In terms of the passivation of steel in a chloride-free SCPS, the resistance of the oxide film decreased with increasing the value of the tensile stress
As the concentration of chloride increased to 10 wt %, the stressed steels yielded a similar charge transfer resistance to or an even lower charge transfer resistance than the non-stressed steel, especially for the plastically stressed steel

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The passivation of steel under stress may be subjected to the synergistic effect of mechanical damage in the passive film and the mechano-electrochemical oxidation activity of steel. Zhang and Poursaee [11] have found that a more protective passive film forms on the surface of steel under tensile stress, compared to that of compressive-stressed and non-stressed steels in a chloride-free concrete pore solution. Various types and levels of stress alter the corrosion behavior of steels in concrete structures In this regard, galvanic corrosion occurs, which typically exists between metals with different corrosion activities [23,24,25,26,27,28] or between dissimilar phases in the microstructure of a metal [29]. To the author’s knowledge, there has been, so far, no study on this subject, which is the objective of this study

Experimental Procedures

Displacements

Results

10. Resistances

Conclusions