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Chinese Journal of Materials Research  2016, Vol. 30 Issue (12): 931-939    DOI: 10.11901/1005.3093.2016.389
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Effect of Impressed Current Cathodic Protection on Corrosion of Anode in Simulated Concrete Pore Solutions
Yangyang WANG1,Jie HU1,2,*(),Wenhao GUO1,Yi ZHAO1,Jiangxiong WEI1,2,Qijun YU1,2
1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
2. Guangdong Province Building Materials Engineering Technology Research Center of Low Carbon Technology, Guangzhou 510640, China
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Yangyang WANG,Jie HU,Wenhao GUO,Yi ZHAO,Jiangxiong WEI,Qijun YU. Effect of Impressed Current Cathodic Protection on Corrosion of Anode in Simulated Concrete Pore Solutions. Chinese Journal of Materials Research, 2016, 30(12): 931-939.

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Abstract  

The quantitative relationship between the electric charge quantity (Q) and OH- concentration (cOH-) was established by measuring the variation of pH value of simulated concrete pore solutions by impressed current cathodic protection (ICCP), and corrosion products formed on the titanium mesh electrode were quantitatively characterized. The results indicate that by the same polarization time, a lower cOH- was related to a higher applied current density; the accumulation of corrosion products on titanium mesh surface was also much heavier. By the same current density, the consumption rate of OH- was larger in the chloride-containing solution rather than that in the chloride-free counterpart. The relationship between Q and cOH- in simulated concrete pore solution by the applied cathodic protection follows logistic regression equation, thus this equation can be used to evaluate the descent of pH near the anode, and further predict the effect of acidification of solutions on the corrosion of external anode by the applied cathodic protection.
Key words:  materials failure and protection      impressed current cathodic protection      simulated concrete pore solutions      external anode      acidification      erosion     
Received:  08 July 2016     
Fund: *Supported by High Technology Research and Development Program of China No. 2015AA034701 National Natural Science Foundation of China No. 51572088 Pearl River Nova Project of Guangzhou No. 201506010004 and the Open Fund of State Key Laboratory of Silicate Building Materials No. SYSJJ2015-08.
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Articles by authors
Yangyang WANG
Jie HU
Wenhao GUO
Yi ZHAO
Jiangxiong WEI
Qijun YU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.389     OR     https://www.cjmr.org/EN/Y2016/V30/I12/931

Element C Si Mn S P Fe
Content 0.18 0.28 0.55 0.04 0.04 98.91
Table 1  Chemical composition of Q235 steel reinforcement (%, mass fraction)
Fig.1  Schematic diagram of experimental set-up (1-galvanostat, 2-electrolytic bridge, 3-Q235 steel reinforcement, 4-titanium mesh, 5-simulated concrete pore solution, 6-wide mouth bottle, 7- rubber plug 8-copper wire)
Sample Designations
Without polarization (chloride-free) Ref
With polarization at a current density of 100 mA/m2(chloride-free) S100
With polarization at a current density of 100 mA/m2(chloride-free) S200
Without polarization (chloride-containing) Cl-Ref
With polarization at a current density of 100 mA/m2(chloride-containing) Cl-S100
With polarization at a current density of 200 mA/m2(chloride-containing) Cl-S200
Table 2  Designations of tested samples in this study
Fig.2  Changes of (a) Na+, (b) K+, (c) Ca2+ contents in chloride-free simulated pore solutions under the condition of impressed current cathodic protection
Fig.3  Changes of (a) Na+, (b) K+, (c) Ca2+ contents in chloride-containing simulated pore solutions under the condition of impressed current cathodic protection
Fig.4  Effects of impressed current cathodic protection on pH values of simulated pore solutions (a) cathode and (b) anode zones
  
Parameter Value Standard Error R2
In chloride-free simulated concrete pore solutions c0 0.095 0.003
Q0 81.574 3.971 0.963
p 2.885 0.282
In chloride-containing simulated concrete pore solutions c0 0.096 0.003
Q0 72.065 3.227 0.970
p 3.012 0.281
Table 3  Fitting parameters in the Logistic equation
Fig.6  Relationship between OH- concentration in the vicinity of anode and the electric charge quantity under the conditions of impressed current cathodic protection
Fig.7  Morphologies of titanium mesh in chloride-free simulated pore solution after 15 d with polarization at (a) 0 mA/m2, (b) 100 mA/m2 and (c) 200 mA/m2
Fig.8  Morphologies of titanium mesh in chloride-containing simulated pore solution after 15 d with polarization at (a) 0 mA/m2, (b) 100 mA/m2 and (c) 200 mA/m2
Fig.9  XRD results of surface products of anodic titanium mesh
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