Corrosion protection of clad 2024 aluminum alloy anodized in tartaric-sulfuric acid bath and protected with hybrid sol-gel coating

被引：136
作者：
Capelossi, V. R. [1 ,2 ]
Poelman, M. [3 ]
Recloux, I. [1 ]
Hernandez, R. P. B. [2 ]
de Melo, H. G. [2 ]
Olivier, M. G. [1 ,3 ]
机构：
[1] Univ Mons, Fac Engn, B-7000 Mons, Belgium
[2] Univ Sao Paulo, Polytech Sch, BR-05508010 Sao Paulo, Brazil
[3] Mat Nova Res Ctr, Mons, Belgium
来源：
ELECTROCHIMICA ACTA | 2014年 / 124卷
关键词：
AA2024-T3; Anodizing process; Sealing; Hybrid sol-gel coatings; Corrosion protection; OXIDE-FILMS; OXALIC-ACID; RESISTANCE; AA2024-T3; 2024-ALUMINUM-ALLOY; ANODIZATION; MOLYBDATE; BEHAVIOR; EIS;
D O I：
10.1016/j.electacta.2013.09.004
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Clad AA2024 T3 specimens were anodized in a tartaric-sulfuric acid bath (TSA) and subsequently protected either by classical Cr-free water sealing treatment or by application of a hybrid sol-gel coating. The sal-gel coating was prepared using a solution with high water content (58 %v/v) and obtained by the hydrolysis and condensation of tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS). The morphology of the sealed anodic films and their thicknesses were evaluated by scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and glow discharge optical emission spectrometry (GDOES). The corrosion resistance of the samples was evaluated by electrochemical impedance spectroscopy (EIS) and salt-spray test. The results showed that the treatment with the hybrid sal-gel increased the resistive properties of the pores compared to the classical water sealing, delaying the access of aggressive species to the barrier layer. (c) 2013 Elsevier Ltd. All rights reserved.
引用
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页码：69 / 79
页数：11
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