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| EFFECT OF CYCLIC HYDROSTATIC PRESSURE ON SACRIFICIAL ANODE CATHODIC PROTECTION |
| HU Shengnan1, ZHANG Tao1,2, SHAO Yawei1,2, MENG Guozhe1,2, WANG Fuhui1,2 |
1. Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The protective performance of cathodic protection (CP) system consisted of Zn-Bi sacrificial anode and Ni-Cr-Mo-V steel was investigated by electrochemical measurements and morphology observation. The shallow-deep water alternating cycle was simulated by immersed the CP system to cyclic conditions of 16 h immersion at atmospheric pressure and 8 h pressurized at 3.5 MPa. The experiment results indicated that the cyclic hydrostatic pressure had significant influence on the CP system. Comparing with the counterpart at atmospheric pressure, the anode potential instantaneously responded to the cyclic hydrostatic pressure and the discharge performance of anode decreased due to the deposition of corrosion product. At the cyclic hydrostatic pressure, the CP system exhibited the higher slope parameter, which indicated that the CP system can not provide the adequate protection for Ni-Cr-Mo-V steel.
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Received: 12 April 2011
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Corresponding Authors:
ZHANG Tao
E-mail: zhangtao@hrbeu.edu.cn
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