Effects of Immersion Time in 3.5 wt.% NaCl Solution on the Corrosion Characteristics of the Zn-Mg Coated Steel

被引：4
作者：
Bae, Kitae [1 ]
La, JoungHyun [1 ]
Kim, KwangBae [1 ]
Lee, SangYul [1 ]
机构：
[1] Korea Aerosp Univ, Dept Mat Engn, Ctr Surface Technol & Applicat, Goyang 412791, South Korea
来源：
SCIENCE OF ADVANCED MATERIALS | 2017年 / 9卷 / 06期
关键词：
Zn-Mg Coating; Corrosion; Impedance Spectroscopy; Electrochemical Properties; ATMOSPHERIC CONDITIONS; MAGNESIUM ALLOYS; ZINC; COATINGS; ELECTRODE; MODEL; PERFORMANCE; RESISTANCE; MECHANISM; PRODUCTS;
D O I：
10.1166/sam.2017.2903
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, Zn-Mg thin films were synthesized using an unbalanced magnetron sputtering process on a cold-rolled steel substrate, and the Zn-Mg coated steel was then immersed in 3.5 wt.% NaCl solution for up to 144 hours. The crystal phase, surface morphology, chemical composition of the Zn-Mg coated steel and its changes as a function of the immersion time were characterized. The effects of immersion time on the corrosion characteristics of the Zn-Mg coated steel were investigated in detail using EIS and potentiodynamic polarization measurements. At the early stage of the immersion, zinc and magnesium intermetallic phases were dissolved preferentially, which resulted in the degradation of the corrosion resistance of the Zn-Mg coated steel. Then the dissolved magnesium formed the Mg-based oxide film on the surface, and the corrosion of this film was delayed as the Mg-based oxide film inhibited oxygen reduction. With increasing immersion time up to 144 hours, zinc corrosion products, such as zinc oxide and simonkolleite formed at the surface of the Zn-Mg coated steel and the corrosion resistance improved.
引用
收藏
页码：881 / 887
页数：7
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