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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (6): 624-630    DOI: 10.11902/1005.4537.2016.122
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Investigation of Cathodic Protection Parameters of Candi-date Materials of Condenser for a Nuclear Power Station and Its Application in Seawater
Tingyong WANG1(),Lanying MA2,Xiangchen WANG1,Haibing ZHANG3,Kai CHEN1,Yonggui YAN3
1. Sunrui Marine Environment Engineering Co., Ltd, Qingdao 266101, China
2. China Petroleum Pipeline Material & Equipment Company Limited, Langfang 065000, China;
3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, CSIC, Qingdao 266101, China
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Abstract  

The electrochemical performance of domestic Ti-alloy TA2, an imported Ti-alloy condenser tube and 316L stainless steel were studied comparatively in seawater by means of electrochemical measurements and slow strain rate method with emphasis on the effect of different polarization potentials on hydrogen embrittlement and the evolution characters of microstructure of the alloys, so that the reasonable protection potential range for condenser in seawater was obtained. The results revealed that galvanic corrosion occurred for the couple of 316L/Ti in seawater, which accelerated the corrosion of 316L stainless steel. When cathodic protection is applied to the above couple, the potential of Ti should be better maintained within a range of -0.50~-0.65 V (vs Ag/AgCl). Based on the above results, the cathodic protection design was conducted for the desired condenser, for which FeMn alloy were proposed as anodes to protect the condenser and worked effectively to ensure the long-term and safe operation.
Key words:  condenser      corrosion      cathodic protection      hydrogen embrittlement      potential     
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Tingyong WANG
Lanying MA
Xiangchen WANG
Haibing ZHANG
Kai CHEN
Yonggui YAN

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Tingyong WANG,Lanying MA,Xiangchen WANG,Haibing ZHANG,Kai CHEN,Yonggui YAN. Investigation of Cathodic Protection Parameters of Candi-date Materials of Condenser for a Nuclear Power Station and Its Application in Seawater. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 624-630.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.122     OR     https://www.jcscp.org/EN/Y2016/V36/I6/624

Fig.1  Titanium tube sample for tensile test
Fig.2  Polarization curves of titanium tube (a), TA2 (b) and 316L stainless steel (c) samples in sea water
Sample EmV IAcm-2 Hydrogen evolutionpotential / V
Foreign titanium tube -170 5.70×10-8 -0.70
Domestic TA2 -189 4.48×10-8 -0.70
316L steel -224 1.38×10-7 -0.85
Table 1  Electrochemical corrosion parameters for3 kinds of material sample
Fig.3  Stress-strain curves at different polarization potentials for titanium tube samples
Conditon Tensile strengthMPa Fracture strengthMPa Elongation
%		 Reduction of area % Hydrogen embrittlement coefficient / %
In air 378.19 210.23 27.33 51.71 ---
Ecorr 387.13 274.96 26.40 48.07 7.05
-0.55 V 379.95 268.93 25.81 45.56 11.90
-0.60 V 388.14 271.20 25.48 43.67 15.55
-0.65 V 381.45 307.21 25.54 42.57 17.68
-0.70 V 372.52 277.14 24.16 38.79 24.99
-0.75 V 386.34 347.51 24.58 36.09 30.20
-0.80 V 374.93 241.88 23.68 34.05 34.16
-0.85 V 382.24 253.79 22.82 33.25 35.69
-0.90 V 382.24 265.24 21.61 33.79 34.66
Table 2  Mechanical performances for titanium tube samples
Fig.4  Hydrogen embrittlement coefficients of titaniumsamples at different polarization potentials
Fig.5  Micrographs of fracture at different potential for titanium samples: (a) in air, (b) Ecorr, (c) -0.55 V, (d) -0.60 V,(e) -0.65 V, (f) -0.70 V, (g) -0.75 V, (h) -0.80 V, (i) -0.85 V, (j) -0.90 V
Fig.6  Curves of cathodic current vs time at different temperatures in seawater
Fig.7  Corrosion morphology photo of condenserchamber
Seawater chamber Left surface
potential / V		 Right surface potential / V Stretching bar
potential / V
1# inlet -0.57 -0.57 -0.55
1# outlet -0.58 -0.59 -0.55
2# inlet -0.64 -0.64 -0.50
2# outlet -0.45 -0.50 -0.51
Table 3  Protective potentials of condenser chamber in seawater (vs Ag/AgCl)
Fig.8  Condenser chamber protected by Fe-Mnalloy anode
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