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| Pitting Behavior of Two Stainless Steels in Simulated Heavy Water Reactor Primary Solution and 3.5%NaCl Solution |
JI Kaiqiang1, LI Guangfu1( ), ZHAO Liang2 |
1.Shanghai Key Lab of Engineering Materials Application and Evaluation，Shanghai Research Institute of Materials, Shanghai 200437, China
2.China National Nuclear Power Operation Management Co. Ltd. , Haiyan 314300, China |
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Abstract The pitting corrosion behavior of stainless steels 304L and 316L, as the structural material used for heavy water collection tubing of nuclear power plant, in simulated primary solution of heavy water reactor and 3.5%NaCl solution at 30 and 60 ℃ was studied by means of electrochemical methods, such as measurements of pitting potential, anodic polarization curve and critical pitting temperature (CPT) etc. The effect of temperature, solution- and material-parameters on the corrosion behavior of the two steels was comparatively examined. The results showed that the pitting potential and CPT of the two steels in the simulated solution were higher than that in 3.5%NaCl solution, and the pitting sensitivity of the steels in the simulated solutions increased with the increase of chloride ion concentration. It was found that the pitting potential and CPT of 316L stainless steel were higher than those of 304L stainless steel in the same environment, thus 316L stainless steel had better pitting resistance. When the test temperature was increased from 30 ℃ to 60 ℃, the pitting sensitivity of the steels in both solutions increased significantly. According to the test results, the methods related with the prevention from corrosion failures in engineering practice are discussed.
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Received: 04 December 2020
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Corresponding Authors:
LI Guangfu
E-mail: guangfuli8298@vip.sina.com
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About author: LI Guangfu, E-mail: guangfuli8298@vip.sina.com
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