Fe-based amorphous coating for corrosion protection of magnesium alloy

被引：95
作者：
Guo, S. F. [1 ,3 ]
Pan, F. S. [1 ,2 ]
Zhang, H. J. [1 ,2 ]
Zhang, D. F. [1 ,2 ]
Wang, J. F. [1 ,2 ]
Miao, J. [3 ]
Su, C. [3 ]
Zhang, C. [4 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
[3] Southwest Univ, Fac Mat & Energy, Chongqing 400715, Peoples R China
[4] Huazhong Univ Sci & Technol, Coll Mat Sci & Engn, Wuhan 430074, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 108卷
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Magnesium alloy; Fe-based amorphous coating; Hybrid coatings; Surface modification; Corrosion resistance; BULK METALLIC-GLASS; BONDING STRENGTH; MG-ALLOY; BEHAVIOR; RESISTANCE; COMPOSITE; AZ91; SIZE;
D O I：
10.1016/j.matdes.2016.07.031
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, AZ61 magnesium alloy coated with NiCrAI intermediate layer with outer of Fe-based amorphous coating was fabricated by high-velocity oxy-fuel thermally spraying. Through the intermediate metallic coating, the traditional mismatch of Fe-based materials and magnesium substrate was overcome, exhibiting good metallurgical bonding in the interface regions. The protective magnesium alloy with Fe-based amorphous coating possesses very high hardness and excellent corrosion resistance in 3.5% NaCI solution, demonstrating by nearly ten times of hardness higher and two orders of magnitude of corrosion rate lower than the magnesium substrate. Similarly to 316L stainless steel coatings, the current Fe-based amorphous coating with a very large passive region, shows much more positive of corrosion potential and much less corrosion current density than that of sprayed Al alloy coating and ceramic coatings on magnesium alloys previously reported. The outstanding feature of the protective magnesium alloy with amorphous coating can be attributed to its unique disorder structure and uniform chemical composition, which allows a very dense passivation film formed and uniform corrosion occurred. Our findings demonstrate that Fe-based amorphous coating is a promising candidate for protecting magnesium alloys with desirable corrosion resistance for structural/functional applications. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：624 / 631
页数：8
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