表面狀態對核級316LN不銹鋼電化學腐蝕行為的影響

郭躍嶺; 韓恩厚; 王儉秋

doi:10.13374/j.issn2095-9389.2016.01.012

表面狀態對核級316LN不銹鋼電化學腐蝕行為的影響

doi: 10.13374/j.issn2095-9389.2016.01.012

郭躍嶺^1,2,
韓恩厚^1,2, ,,
王儉秋²

1. 北京科技大學國家材料服役安全科學中心, 北京 100083;
2. 中國科學院金屬研究所中國科學院核用材料與安全評價重點實驗室, 沈陽 110016

基金項目:

國家重點基礎研究發展計劃資助項目(2011CB610501)

國家科技重大專項課題(2011ZX06004-009)

詳細信息

通訊作者:
韓恩厚,E-mail:ehhan@imr.ac.cn

中圖分類號: TG142.71;TG174.1
計量
- 文章訪問數: 212
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- 被引次數: 0
出版歷程
- 收稿日期: 2014-09-30
- 網絡出版日期: 2021-07-05

Effects of surface state on the electrochemical corrosion behavior of nuclear grade 316LN stainless steel

1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang

摘要

摘要: 表征了打磨態和機械拋光態316LN不銹鋼表面的粗糙度、表面殘余應變和表面電子功函數的分布,并研究了打磨態和機械拋光態樣品在硼酸鹽溶液中電化學腐蝕行為的差異.與機械拋光態316LN不銹鋼相比,打磨處理后樣品表面較為粗糙,且表面的微觀殘余應變較大,近表面產生約50μm的加工硬化層.表面粗糙度和微觀應變的增加引起打磨態表面電化學活性的增大,從而促進316LN不銹鋼在硼酸鹽溶液中腐蝕.機械拋光處理降低了表面鈍化膜的載流子密度(供體和受體),并增大了鈍化膜的阻抗,提高了鈍化膜的致密性和保護性,能夠有效抑制金屬的進一步腐蝕.
- 不銹鋼 /
- 鋼腐蝕 /
- 表面狀態 /
- 電化學
Abstract: Differences between the ground and mechanically polished 316 LN stainless steel were characterized on the surface topography,surface residual strain and electron work function. The electrochemical behavior of the stainless steel was investigated in a borate buffer solution. The ground 316 LN stainless steel is featured by a rougher surface with scratches along the grinding direction.Compared with the mechanically polished sample,a thicker cold-worked layer(~50 μm) is imparted by surface grinding,indicating that the residual strain on the ground surface is much higher. The ground surface is more electrochemically active and exhibits a larger corrosion rate in the borate buffer solution,because of its rougher surface topography and a higher residual strain. The passive film on the mechanically polished sample is more compact and protective,due to the decrease of acceptor and donor density and the increase of total impedance of the passive film.
- stainless steel /
- steel corrosion /
- surface states /
- electrochemistry