本文選題：不銹鋼　切入點：點腐蝕　出處：《腐蝕與防護》2015年12期

【摘要】：采用動電位掃描、電化學阻抗譜和電化學噪聲等方法研究了不同表面粗糙度的304不銹鋼在體積分數(shù)10%HNO3溶液中鈍化后的耐蝕性。結(jié)果表明,隨304不銹鋼鈍化前表面粗糙度從0.25μm降到0.10μm,電荷轉(zhuǎn)移電阻從6.51kΩ·cm2上升到19.17kΩ·cm2,電位標準偏差和電流標準偏差降低,而噪聲電阻增大;隨表面粗糙度的增大,試樣電位和電流的功率密度曲線線性部分的斜率均出現(xiàn)增大,譜噪聲曲線線性部分的斜率下降,表明在光滑的不銹鋼表面更容易形成致密穩(wěn)定且耐腐蝕性強的氧化膜,硝酸鈍化能顯著改善304不銹鋼耐點蝕性能。
[Abstract]:The corrosion resistance of 304 stainless steel with different surface roughness after passivation in 10%HNO3 solution with different surface roughness was studied by potentiodynamic scanning, electrochemical impedance spectroscopy and electrochemical noise. As the surface roughness of 304 stainless steel decreases from 0.25 渭 m to 0.10 渭 m, the charge transfer resistance increases from 6.51 k 惟 cm2 to 19.17 k 惟 cm 2, the standard potential deviation and current standard deviation decrease, but the noise resistance increases, and the surface roughness increases with the increase of surface roughness. The slope of the linear part of the power density curve of the potential and current increases, and the slope of the linear part of the spectral noise curve decreases, which indicates that it is easier to form a dense and stable oxide film with strong corrosion resistance on the smooth surface of stainless steel. The pitting corrosion resistance of 304 stainless steel can be significantly improved by nitric acid passivation.
【作者單位】： 南昌航空大學材料科學與工程學院;佛山科學技術(shù)學院理學院;上海民航職業(yè)技術(shù)學院;
【基金】：佛山市科技計劃項目(2014AG10009) 佛山市高明區(qū)產(chǎn)學研項目(201205)
【分類號】：TG142.71

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本文編號：1687521