Liquid phase formation of alkyl- and perfluoro-phosphonic acid derived monolayers on magnesium alloy AZ31 and their chemical properties.
作者： Takahiro Ishizaki , Katsuya Teshima , Yoshitake Masuda , Michiru Sakamoto
DOI: 10.1016/J.JCIS.2011.04.039
关键词:
摘要: Alkyl- and perfluoro-phosphonic acid derived SAMs were successfully formed on Mg alloy by liquid phase method for the first time. The chemical anticorrosive properties of prepared magnesium alloys characterized using contact angle measurements, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), electrochemical measurements. Water measurements revealed that maximum advancing/receding water angles n-octyl (OP: CH3(CH2)7PO(OH)2), n-dodecyl (DP: CH3(CH2)11PO(OH)2), n-octadecyl (ODP: CH3(CH2)17PO(OH)2) phosphonic acid, 2(perfluorohexyl)ethyl (PFEP: CF3(CF2)5CH2CH2PO(OH)2) 105.1/64.7, 108.3/69.6, 111.9/75.2, 115.2/67.4 respectively. In case alkylphosphonic (OP, DP, ODP), advancing receding increased with an increase in preparation angle-resolved XPS (AR-XPS) data film thicknesses OP, ODP, PFEP estimated to be 0.8, 1.2, 1.7, 1.1 nm, O 1s support SAM is covalently bound oxide or hydroxide surface a monodenate bidenate manner. Chemical stability alkyl- modified surfaces was investigated aqueous solutions at pH = 4.0, 7.0, 10.0. decreased rapidly within 5 min after immersion all less than 20. On other hand, ODP 4, 7 10 45.1, 89.3, 85.5, had highest four types used this study, indicating molecular density would higher those alloy. corrosion resistance potentiodynamic polarization curve exhibits protective solution containing Cl � ions compared unmodified
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