Silane coating of metal substrates: Complementary use of electrochemical, optical and thermal analysis for the evaluation of film properties

被引：82

作者：

De Graeve, I. ^{[1
]}

Vereecken, J. ^{[1
]}

Franquet, A. ^{[1
]}

Van Schaftinghen, T. ^{[1
]}

Terryn, H. ^{[1
]}

机构：

[1] Free Univ Brussels, Dept Met Electrochem & Mat Sci, B-1050 Brussels, Belgium

来源：

PROGRESS IN ORGANIC COATINGS | 2007年 / 59卷 / 03期

关键词：

silane; surface characterisation; curing; barrier properties;

D O I：

10.1016/j.porgcoat.2006.09.006

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Silane coating is a metal surface pre-treatment introduced as a replacement for chromium treatments. It is supposed to be suited for various metals, including aluminium, steel and galvanised steel. Good corrosion performance has been assigned to these hybrid organic-inorganic thin film deposition systems. The silane molecules contain -Si-O-CnH(2n+1) groups, which after hydrolysis into reactive silanol groups -Si-OH form a covalent bonded layer on the metal surface. Curing of these films is considered essential for corrosion protection; during heat treatment, condensation of unreacted silanol groups in the film result in the formation of a -Si-O-Si- network with enhanced barrier properties. This contribution gives a chemical and morphological characterisation, obtained with spectroscopic ellipsometry (SE), of BTSE silane coated aluminium as a function of curing. Further, with thermal gravimetric analysis combined with mass spectroscopy (TGA-MS), the mechanism and kinetics of the curing process are explained, and the resulting barrier properties are measured using electrochemical impedance spectroscopy (EIS). (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：224 / 229

页数：6

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