磁场对Co-Pt-P薄膜结构及耐蚀性的影响
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摘要
采用外加垂直磁场的电化学沉积方法制备了Co-Pt-P薄膜。对薄膜的结构及成分进行了分析,并借助电化学检测技术研究了薄膜在质量分数为3.5%的NaCl溶液中的耐蚀性。结果表明:随着磁场强度的增大,Co-Pt-P薄膜表面的晶粒逐渐细化,ε-Co的质量分数增加;薄膜在质量分数为3.5%的NaCl溶液中的自腐蚀电位逐渐正移,电极/溶液界面的双电层电容Cd降低,表面沉积膜电阻Rf和电荷传递电阻Rt增大,自腐蚀电流密度逐渐减小,耐蚀性增强。
The Co-Pt-P film was prepared by electrochemical deposition with externally applied perpendicular magnetic field(PMF).The microstructure and composition of the film were analyzed,and its corrosion resistance in 3.5 % mass fraction NaCl solution was studied with the aid of electrochemical detection technologies.The results show that as PMF intensity increases,the grains on the film surface are gradually refined,and the mass fraction ofε-Co increases;in 3.5% mass fraction NaCl solution,the self-corrosion potential of the film gradually shifts to the positive direction,the double layer capacitance of electrode/electrolyte interface Cdreduces,the resistance of surface deposition film Rfand charge transfer resistance Rt increases,and the self-corrosion current density gradually decreases,thus the corrosion resistance of the film increases.
The Co-Pt-P film was prepared by electrochemical deposition with externally applied perpendicular magnetic field(PMF).The microstructure and composition of the film were analyzed,and its corrosion resistance in 3.5 % mass fraction NaCl solution was studied with the aid of electrochemical detection technologies.The results show that as PMF intensity increases,the grains on the film surface are gradually refined,and the mass fraction ofε-Co increases;in 3.5% mass fraction NaCl solution,the self-corrosion potential of the film gradually shifts to the positive direction,the double layer capacitance of electrode/electrolyte interface Cdreduces,the resistance of surface deposition film Rfand charge transfer resistance Rt increases,and the self-corrosion current density gradually decreases,thus the corrosion resistance of the film increases.
引文
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[2]SHINOHARA K,AOGAKI R.Magnetic field effect oncopper corrosion in nitric acid[J].Electrochemistry,1999,67(2):126-131.
[3]任树洋.强磁场对真空蒸发薄膜生长的影响研究[D].上海:上海大学,2011.
[4]SUEDA M,KATSUKI A,FUJIWARA Y,et al.Influencesof high magnetic field on glycine crystal growth[J].Science andTechnology of Advanced Materials,2006,7(4):380-384.
[5]MOGI I,KAMIKO M.Striking effects of magnetic field on thegrowth morphology of electrochemical deposits[J].Journal ofCrystal Growth,1996,166(1):276-280.
[6]SHINOHARA K,HASHIMOTO K,AOGAKI R.Shift of theiron corrosion potential and acceleration of the mass transportof dissolved oxygen by the micro-MHD effect[J].ChemistryLetters,2002(8):738-739.
[7]MATSUSHIMA H,FUKUNAKA Y,ITO Y,et al.Anomalous scaling of iron thin film electrodeposited in amagnetic field[J].Journal of Electroanalytical Chemistry,2006,587(1):93-98.
[8]KIM S H,ERB U,AUST K T,et al.The corrosion behaviorof nanocrystalline electrodeposits[J].Plating and SurfaceFinishing,2004,91(5):68-70.
[9]NOVOTNY V,STAUD N.Correlation betweenenvironmental and electrochemical corrosion of thin filmmagnetic recording media[J].Journal of the ElectrochemicalSociety,1988,135(12):2 931-2 938.