Electrochemical impedance spectroscopy evaluation of the corrosion behaviour of Mg alloy coated with PECVD organosilicon thin film

被引:67
作者
Angelini, E
Grassini, S
Rosalbino, F
Fracassi, F
d'Agostino, R
机构
[1] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10129 Turin, Italy
[2] Univ Bari, Dipartmento Chim, CNR, Ctr Studio Chim Plasmi, I-70126 Bari, Italy
关键词
electrochemical impedance spectroscopy; magnesium alloys; corrosion protection; PECVD; thin film;
D O I
10.1016/S0300-9440(02)00217-5
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
This paper describes the preliminary results on the utilization of thin film deposited in Plasmas fed with hexamethyldisiloxane-oxygen (HMDSO-O-2) mixture for the corrosion protection of Mg alloys. The corrosion behavior of coated substrates has been evaluated by means of impedance measurements performed in aerated 0.1 M Na2SO4 solution. Interesting and promising results have been obtained when a suitable plasma pretreatment is performed both with hydrogen and CF4 fed plasmas and therefore when the extent of surface oxidation is reduced or when the magnesium surface is fluorinated. As a matter of fact, the charge transfer resistance, R-ct, increases from about 60Omegacm(2) for the uncoated alloy to more than 90 kOmegacm(2) after deposition of a 1300 nm thick SiOx film. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:107 / 111
页数:5
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