Improved corrosion protection of aluminium alloy AA 2024 by sol-gel hybrid coatings after surface pretreatment by silanisation

被引：14
作者：
Basu, B. J. [1 ]
Srinivasan, A. [1 ]
Manasa, J. [1 ]
Grips, V. K. W. [1 ]
机构：
[1] CSIR Natl Aerosp Labs, Surface Engn Div, Bangalore 560017, Karnataka, India
来源：
SURFACE ENGINEERING | 2012年 / 28卷 / 04期
关键词：
Sol-gel; Hybrid coatings; Cerium inhibitor; Corrosion resistance; Aluminium alloy; ELECTROCHEMICAL-BEHAVIOR; CERIUM; FILMS; RESISTANCE; AA2024-T3;
D O I：
10.1179/1743294411Y.0000000074
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Sol-gel derived organic-inorganic hybrid coatings have been investigated as a potential replacement for the environmentally hazardous chromate conversion coatings for corrosion protection of aerospace aluminium alloy AA 2024. Sol-gel hybrid coatings were prepared using a sol mixture (1 : 1 volume ratio) of 3-glycidoxypropyl trimethoxysilane and tetraethoxysilane and doped with cerium nitrate and deposited on AA 2024 by dip coating and spray coating techniques. The effect of surface pretreatment on the corrosion protection efficiency of the sol-gel hybrid coatings was studied. The corrosion resistance of the coatings in 3.5% sodium chloride solution was evaluated by potentiodynamic polarisation measurements, electrochemical impedance spectroscopy and salt spray tests. The results showed that a sol-gel coating system with a simple silanisation as surface pretreatment exhibited improved corrosion protection for AA 2024.
引用
收藏
页码：294 / 299
页数：6
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