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Korean Journal of Metals and Materials > Volume 54(10); 2016 > Article
Korean Journal of Metals and Materials 2016;54(10): 723-731. doi: https://doi.org/10.3365/KJMM.2016.54.10.723
용융아연 도금특성에 미치는 Mg 미량첨가 영향
홍문희1, 강덕구1, 백두진2, 황현석3, 박성호3
1POSCO 철강생산본부 Project Team
2POSCO 광양제철소 도금부
3POSCO 기술연구원 표면처리연구그룹
Effect of Added Magneisum on the Coating Properties of Galvanized Steel Sheets
Moon-Hi Hong1, Deok-Gu Kang1, Doo-Jin Paik2, Hyeon-Seok Hwang3, Sung-ho Park3
1Project team, POSCO Steel Production Division, Gwangyang 57807, Republic of Korea
2Dept. of Surface Treatment, POSCO Kwangyang Works, Gwangyang 57807, Republic of Korea
3Gr. of Surface Treatment, POSCO Technical Research Lab., Pohang 37673, Republic of Korea
Correspondence  Moon-Hi Hong ,Tel: +82-61-790-2036, Email: moonhihong@posco.com
Received: 14 December 2015;  Accepted: 19 April 2016.  Published online: 5 October 2016.
ABSTRACT
The effect of a small amount of added Mg on the microstructure, Fe-Al inhibition layer, corrosion resistance and welding properties of hot-dip galvanized and galvannealed steel sheets were investigated. Both the microstructure and distribution of Mg were measured by scanning electron microscopy, transmission electron microscopy, glow discharge spectrometer and electron probe micro analyzer. A thin Mg layer was inhomogeneously precipitated between the Zn-coating and Al inhibition layer. During the annealing process around 470-510 ℃, the Mg layer was completely diffused into the inside and/or extreme surface of the Zn coating. The corrosion resistance of galvannealed steel sheets produced in a commercial galvanizing line was significantly improved by adding a small amount of Mg into the molten zinc pot. Fe content, the formation of the Fe-Al inhibition layer and weldability were also influenced by the Mg addition.
Keywords: Mg addition, corrosion resistance, galvanized and galvannealed coatings
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