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表面狀態對核級316LN不銹鋼電化學腐蝕行為的影響

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

  • 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.

     

    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.

     

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