摘要
采用动电位扫描、电化学阻抗谱和电化学噪声等方法研究了不同表面粗糙度的304不锈钢在体积分数10%HNO3溶液中钝化后的耐蚀性。结果表明,随304不锈钢钝化前表面粗糙度从0.25μm降到0.10μm,电荷转移电阻从6.51kΩ·cm2上升到19.17kΩ·cm2,电位标准偏差和电流标准偏差降低,而噪声电阻增大;随表面粗糙度的增大,试样电位和电流的功率密度曲线线性部分的斜率均出现增大,谱噪声曲线线性部分的斜率下降,表明在光滑的不锈钢表面更容易形成致密稳定且耐腐蚀性强的氧化膜,硝酸钝化能显著改善304不锈钢耐点蚀性能。
After passivation in 10vol% HNO3 solution,the corrosion resistance of 304 stainless steel samples with different surface roughnesses were studied with potentiodynamic scan,electrochemical impedance spectroscopy（EIS）and electrochemical noise（EN）.The results show that when the surface roughness decreased from 0.25μm to0.1μm,the charge-transfer resistance raised from 6.51kΩ·cm^2 to 19.17kΩ·cm^2,current standard deviation and potential standard deviation decreased,but noise resistance increased.The slopes of line segment in power spectral density（PSD）curves of potential and current increased,but the slope of noise spectrum curve decreased with the increase of surface roughnesses of samples,indicating that compact and stable passivation film was easily formed on the smooth surface of stainless steel.HNO3 passivation could markedly improve the pitting corrosion resistance of 304 stainless steel.
出处
《腐蚀与防护》
CAS
北大核心
2015年第12期1156-1160,1165,共6页
Corrosion & Protection
基金
佛山市科技计划项目(2014AG10009)
佛山市高明区产学研项目(201205)
关键词
304不锈钢
点腐蚀
动电位扫描
电化学噪声
电化学阻抗谱
304stainless steel
pitting corrosion
potentiodynamic scan
electrochemical noise
electrochemical impedance spectroscopy
