In the flux used in the batch galvanizing process, the effect of the component ratio of NH₄Cl to ZnCl₂ on the microstructure, coating adhesion, and corrosion resistance of Zn-Mg-Al ternary alloy-coated steel is evaluated. Many defects such as cracks and bare spots are formed inside the Zn-Mg-Al coating layer during treatment with the flux composition generally used for Zn coating. Deterioration of the coating property is due to the formation of AlClx mixture generated by the reaction of Al element and chloride in the flux. The coatability of the Zn-Mg-Al alloy coating is improved by increasing the content of ZnCl2 in the flux to reduce the amount of chlorine reacting with Al while maintaining the flux effect and the coating adhesion is improved as the component ratio of NH4Cl to ZnCl2 decreases. Zn-Mg-Al alloy-coated steel products treated with the optimized flux composition of NH₄Cl•3ZnCl₂ show superior corrosion resistance compared to Zn-coated steel products, even with a coating weight of 60 %.

1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

• 김기연(전북대학교 신소재공학부 금속시스템공학과) | Ki-Yeon Kim (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 소성민(전북대학교 신소재공학부 금속시스템공학과) | Seong-Min So (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 오민석(전북대학교 신소재공학부 금속시스템공학과) | Min-Suk Oh (Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea) Corresponding author