壓水堆一回路主管道316L不銹鋼的電化學腐蝕行為

汪家梅; Farzin Arjmand; 杜東海; 陳凱; 賴平; 高文華; 張浩; 郭相龍; 張樂福

doi:10.13374/j.issn2095-9389.2017.09.008

壓水堆一回路主管道316L不銹鋼的電化學腐蝕行為

doi: 10.13374/j.issn2095-9389.2017.09.008

上海交通大學核能科學與工程學院, 上海 200240

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中圖分類號: TL341
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出版歷程
- 收稿日期: 2016-07-18

Electrochemical corrosion behaviors of 316L stainless steel used in PWR primary pipes

School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

摘要

摘要: 通過中心復合設計試驗法設計試驗,結合動電位極化曲線和電化學阻抗譜的測量以及氧化膜形貌觀察和成分測量,研究了溫度(30~350℃)、Cl^-質量濃度(10~1000 μg·L^-1)和溶解氧質量濃度(0~200 μg·L^-1)3種因素對壓水堆一回路主管道316L不銹鋼電化學腐蝕性能的影響.結果表明:溫度是影響316L不銹鋼電化學腐蝕性能最顯著的因素,溫度越高,腐蝕電流密度越大,點蝕電位越低;Cl^-濃度和溶解氧濃度對316L不銹鋼電化學腐蝕性能的影響與溫度密切相關,溫度較低時(T < 150℃),Cl^-濃度和溶解氧濃度均對316L腐蝕電流密度幾乎無影響,但點蝕電位卻隨Cl^-濃度增加和溶解氧濃度的降低而降低;溫度較高時,分別為T > 130℃和T > 150℃,Cl^-濃度和溶解氧濃度均對316L點蝕電位幾乎無影響,但腐蝕電流密度卻隨Cl^-和溶解氧的濃度增加而顯著增加,腐蝕加劇.電化學阻抗譜的測量和氧化膜形貌的觀察也進一步驗證了上述試驗結果.
- 316L不銹鋼 /
- 電化學阻抗譜 /
- 高溫電化學腐蝕 /
- 中心復合試驗法
Abstract: The effects of temperature and Cl^-and dissolved oxygen (DO) concentrations on the electrochemical corrosion behaviors of 316L stainless steel used in pressurized water reactor primary pipes were investigated via a composite design strategy, potentiodynamic polarization and electrochemical impedance spectroscopy measurements, and oxide film morphology observation. The results reveal that temperature is the most significant factor affecting the corrosion behavior of the steel:the higher the temperature, the higher the corrosion current density and the lower the pitting potential of the steel. The effects of Cl^-and dissolved oxygen concentrations are highly related to the temperature. When the temperature is relatively low (T < 150℃), relationships between the Cl^-and dissolved oxygen concentrations and corrosion current density of the steel are hardly observed, although the pitting potential decreases with increasing Cl^-concentration and decreasing dissolved oxygen concentration. As the temperature increases, the dependence of pitting potential on the Cl^-and dissolved oxygen concentrations disappears (at T > 130℃ and T > 150℃, respectively), and the corrosion current density increases with increasing Cl^-and dissolved oxygen concentrations. The electrochemical impedance spectroscopy (EIS) measurements and oxide film observations further confirmed these experimental results.
- 316L stainless steel /
- electrochemical impedance spectroscopy /
- high-temperature electrochemical corrosion /
- central composite design

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