304不銹鋼在模擬壓水堆一回路水中高溫電化學腐蝕行為

汪家梅; 陸輝; 張樂福; 孟凡江; 徐雪蓮

doi:10.13374/j.issn2095-9389.2017.03.012

304不銹鋼在模擬壓水堆一回路水中高溫電化學腐蝕行為

doi: 10.13374/j.issn2095-9389.2017.03.012

1) 上海交通大學核能科學與工程學院, 上海 200240
2) 上海核工程研究設計院, 上海 200233

基金項目:

重大專項CAP1400關鍵設計技術研究資助項目（2010ZX06002-001）

詳細信息

中圖分類號: TL341
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出版歷程
- 收稿日期: 2016-05-09

Electrochemical corrosion behavior of 304 stainless steel in simulated pressurized water reactor primary water

1) School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2) Shanghai Nuclear Engineering Research & Design Institute, Shanghai 200233, China

摘要

摘要: 通過模擬壓水堆一回路水環境，研究了氯離子濃度和溶解氧對304不銹鋼高溫電化學腐蝕行為的影響.動電位極化曲線結果表明，氯離子濃度主要影響高電位下的二次鈍化效應，低電位下影響效果不明顯，結合X射線光電子能譜對氧化膜元素成分的分析發現二次鈍化效應與氧化膜中Fe/Cr元素含量比密切相關.電化學阻抗譜和掃描電鏡結果表明，隨著氯離子濃度增加，氧化膜阻抗逐漸降低，表面外層氧化物顆粒和間隙逐漸增大，耐腐蝕性能降低.隨著溶解氧含量的升高，304自腐蝕電位逐漸升高，鈍化電流密度降低，鈍化區間縮小，表面氧化膜阻抗逐漸增加.
- 不銹鋼 /
- 壓水堆 /
- 高溫 /
- 電化學 /
- 鋼腐蝕
Abstract: The effects of chloride concentration and dissolved oxygen on the high-temperature electrochemical corrosion behaviors of 304 stainless steel sheets were investigated in simulated pressurized water reactor (PWR) primary water. The results of potentiodynamic polarization measurements reveal that the chloride ion mainly affects the second passivation region under high potential, but little effect under low potential. Oxide film chemical content analysis by X-ray photoelectron spectroscopy (XPS) shows that the second passivation properties are closely related to the Fe/Cr ratio of the oxide film. Electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) results show that, when the chloride ion concentration increases, the oxide film resistance decreases, the size of oxide particles and the gap between oxide particles on the outer layer increases and the corrosion resistance decreases. Besides, with the increase of dissolved oxygen, the corrosion potential increases, the passive current density decreases, the passive potential region shrinks, and the oxide film resistance gradually increases.
- stainless steel /
- pressurized water reactors /
- high temperature /
- electrochemistry /
- steel corrosion

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參考文獻(22)

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