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알루미늄과 마그네슘 첨가가 용융아연 도금강판 도금층의 미세조직과 경도에 미치는 영향
성윤제 ( Yoonje Sung ),김동규 ( Donggyu Kim ),서준기 ( Jungi Seo ),한경현 ( Kyunghyun Han ),홍범기 ( Beomki Hong ),김강민 ( Kangmin Kim ),허성욱 ( Seounguk Heo ),박성현 ( Seonghyun Park ),임재택 ( Jae-taek Im ),손승배 ( Seung Bae 한국열처리공학회 2023 熱處理工學會誌 Vol.36 No.4
We investigated the effects of Al and Mg on the microstructure and hardness of the coating layer of galvanized steel sheets, by thermodynamic calculations, X-ray diffraction, scanning electron microscopy, and Vickers hardness tests of Zn-0.2Al, Zn-6Al-2Mg, and Zn-10Al-5Mg coating layers. Regardless of the alloy composition of the galvanizing bath, a Fe-Al layer was observed between the coating layer and steel sheet. The Zn- 0.2Al coating layer consists of major h.c.p. Zn phase and minor f.c.c. Al phase. The fraction of f.c.c. Al phase (containing a significant amount of Zn) of the coating layer increases with increasing the chemical composition of Al of the galvanizing bath. The h.c.p. MgZn<sub>2</sub> phase was formed in the Al/Mg-containing Zn-6Al-2Mg and Zn-10Al- 5Mg coating layers, forming Zn-Al-MgZn<sub>2</sub> eutectic microstructure. The primary MgZn<sub>2</sub> phase was additionally formed in the Zn-10Al-5Mg coating layers containing high concentrations of Al and Mg. The Vickers hardness values of Zn-0.2Al, Zn-6Al-2Mg, and Zn-10Al-5Mg coating layers were 59.1 ± 1.2 HV, 161.2 ± 5.7 HV, and 215.5 ± 40.3 HV, respectively. The addition of Al and Mg increased the hardness of the coating layer by increasing the fraction of the Al phase (containing Zn) and MgZn<sub>2</sub> intermetallic compound, which were harder than the Zn phase. (Received June 7, 2023; Revised July 11, 2023; Accepted July 20, 2023)