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http://dx.doi.org/10.5695/JKISE.2016.49.2.202

Influence of Heat Treatment and Magnesium Content on Corrosion Resistance of Al-Mg Coated Steel Sheet  

Kang, Jae Wook (Div. of Marine Engineering, Korea Maritime and Ocean University)
Park, Jun-Mu (Div. of Marine Engineering, Korea Maritime and Ocean University)
Hwang, Sung-Hwa (Div. of Marine Engineering, Korea Maritime and Ocean University)
Lee, Seung-Hyo (Div. of Marine Engineering, Korea Maritime and Ocean University)
Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Lee, Myeong-Hoon (Div. of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean institute of surface engineering / v.49, no.2, 2016 , pp. 202-210 More about this Journal
Abstract
This study was intended to investigate the effect of the amount of magnesium addition and heat treatment in the Al-Mg coating film in order to improve corrosion resistance of aluminum coating. Al-Mg alloy films were deposited on cold rolled steel by physical vapor deposition sputtering method. Heat treatment was fulfilled in an nitrogen atmosphere at the temperature of $400^{\circ}C$ for 10 min. The morphology was observed by SEM, component and phase of the deposited films were investigated by using GDLS and XRD, respectively. The corrosion behaviors of Al-Mg films were estimated by exposing salt spray test at 5 wt.% NaCl solution and measuring polarization curves in deaerated 3 wt.% NaCl solution. With the increase of magnesium content, the morphology of the deposited Al-Mg films changed from columnar to featureless structure and particle size was became fine. The x-ray diffraction data for deposited Al-Mg films showed only pure Al peaks. However, Al-Mg alloy peaks such as $Al_3Mg_2$ and $Al_{12}Mg_{17}$ were formed after heat treatment. All the sputtered Al-Mg films obviously showed good corrosion resistance compared with aluminum and zinc films. And corrosion resistance of Al-Mg film was increased after heat treatment.
Keywords
Al-Mg coating; Physical vapor deposition; Corrosion resistance; Heat treatment;
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