Determination of Steady Critical Current Density of Hydrogen Evolution During Electrochemical Repair Process of Reinforced Concrete

doi:10.11902/1005.4537.2016.067

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 382-388 DOI: 10.11902/1005.4537.2016.067

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Determination of Steady Critical Current Density of Hydrogen Evolution During Electrochemical Repair Process of Reinforced Concrete

Teng LI^1,², Weiliang JIN^1,³(

), Chen XU¹, Jianghong MAO³

1 Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2 Zhejiang Electric Power Design Institute, Hangzhou 310012, China
3 Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China

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Abstract

Cathodic polarization curves of steel bar were measured via potentiodynamic polarization method. Then it gets the first-order differential analysis of polarization curves and acquires the critical hydrogen evolution potential and the hydrogen evolution current density of the steel bar. Next, the steady-state critical current density of hydrogen evolution was obtained by means of steady-state measurement. Results show that potentiodynamic polarization curves can monitor the electrochemical reaction process of the cathode. Before the abrupt point of the differential curve, the cathode reaction is dominated by the oxygen consumption reaction, and the hydrogen evolution reaction is the main control reaction after the abrupt point. With polarization curves, the steady-state critical current density of hydrogen evolution of the steel bar in reinforced concrete could be determined and thereby the probability of hydrogen embrittlement could be predicted. By this method, the steady-state hydrogen evolution critical current density of the test steel bar is acquired to be about 0.355 A/m².

Key words: electrochemical repair hydrogen embrittlement cathodic polarization curve hydrogen evolution reaction critical current density

Received: 26 May 2016

ZTFLH:

TU528.0

Fund: Supported by National Natural Science Foundation of China (51578490, 51408534 and 51408544), Natural Science Foundation of Zhejiang Province (LQ14E080010), Major Technological Innovation Program of Hangzhou (20142011A41) and Science and Technology Funds of Hangzhou (20131831K31, 2014533B42and 20130533B18)

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These authors contributed equally to this work.

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Cite this article:

Teng LI, Weiliang JIN, Chen XU, Jianghong MAO. Determination of Steady Critical Current Density of Hydrogen Evolution During Electrochemical Repair Process of Reinforced Concrete. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 382-388.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.067 OR https://www.jcscp.org/EN/Y2017/V37/I4/382

Fig.1 E_e-pH curves of hydrogen-evolution reaction andoxygen-consumption reaction

Fig.2 Schematic diagrams of the dimensions of concrete specimen (unit: mm)

Fig.3 Test set for determination of dynamic potential pola-rization curves

Fig.4 Testing device for determination of polarization current density in steady state

Fig.5 Dynamic polarization curves of rebar in the concrete

Fig.6 First-order derivatives of the dynamic polarization curves in Fig.5

Fig.7 Dynamic polarization curve and its derivative curve of the test block 1

Table 1 Critical hydrogen evolution potential and critical current density of three test blocks

Fig.8 Changes of cathodic polarization potential withtime under different current conditions

Table 2 Corresponding steady state potential under each applied current density

Fig.9 Relation curves of the polarization current density and the cathodic polarization potential

Table 3 Critical current density for hydrogen evolution of each test block under steady state

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