Development and characterization of sol-gel silica-alumina composite coatings on AISI 316L for implant applications

被引：78
作者：
Tiwari, S. K. [1 ]
Mishra, T. [1 ]
Gunjan, M. K. [1 ]
Bhattacharyya, A. S. [1 ]
Singh, T. B. [1 ]
Singh, R. [1 ]
机构：
[1] Natl Met Lab, Jamshedpur 831007, Bihar, India
来源：
SURFACE & COATINGS TECHNOLOGY | 2007年 / 201卷 / 16-17期
关键词：
stainless steel; coating; sol-gel; aluminium oxide; corrosion resistance; bioimplant;
D O I：
10.1016/j.surfcoat.2007.02.026
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Sol-gel alumina coatings were deposited on medical grade stainless steel (AISI 316L) with an intermediate layer of silica by dip-coating method. The coatings obtained were homogeneous, crack-free and consisted of low crystalline gamma-Al2O3 along with some boehmite phase. EDAX revealed the presence of only Al in the film. The corrosion performance of alumina-coated stainless steel was evaluated by electrochemical polarization, open-circuit potential measurement and chronoamperometry in Ringer's solution. Coating has shown to enhance the pitting potential of AISI 316L by similar to 470 mV and reduced passive current <= 10(-9) A cm(-2). The formation of thermodynamically stable silica-alumina interface was proposed to account for enhanced corrosion protection behaviour of the coating. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：7582 / 7588
页数：7
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