Silica doped with lanthanum sol-gel thin films for corrosion protection

被引：15
|
作者：
Abuin, M. [1 ]
Serrano, A. [2 ]
Llopis, J. [1 ]
Garcia, M. A. [2 ,3 ]
Carmona, N. [1 ]
机构：
[1] Univ Complutense, Dept Mat Phys, Madrid 28004, Spain
[2] CSIC, Glass & Ceram Inst, E-28049 Madrid, Spain
[3] IMDEA Nanosci, Madrid 28049, Spain
来源：
THIN SOLID FILMS | 2012年 / 520卷 / 16期
关键词：
Lanthanum; Corrosion protection; Sol-gel film; Scanning electron microscopy; X-ray absorption spectroscopy; COATINGS; SYSTEM; XAS;
D O I：
10.1016/j.tsf.2012.03.046
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present here anticorrosive silica coatings doped with lanthanum ions for the protection of metallic surfaces as an alternative to chromate (VI)-based conversion coatings. The coatings were synthesized by the sol-gel method starting from silicon alkoxides and two different lanthanum precursors: La (III) acetate hydrate and La (III) isopropoxide. Artificial corrosion tests in acid and alkaline media showed their effectiveness for the corrosion protection of AA2024 aluminum alloy sheets for coating prepared with both precursors. The X-ray absorption Near Edge Structure and X-ray Absorption Fine Structure analysis of the coatings confirmed the key role of lanthanum in the structural properties of the coating determining its anticorrosive properties. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：5267 / 5271
页数：5
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