Zn/Zn-Mg 이중 층 박막의 밀착력 향상을 위한 Zn interlayer 미세구조 제어에 관한 연구

• Published in: 대한금속·재료학회지, 57(11) Vol. 57; no. 11; pp. 695 - 700
• Main Authors: 이승환, Seung-hwan Lee, 김회근, Hoe-kun Kim, 송면규, Myeon-kyu Song, 김정완, Jung-wan Kim, 이상율, Sang-yul Lee
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.11.2019; 대한금속·재료학회
• Subjects: adhesion; columnar structure; lap shear test; structure zone model; Zn interlayer; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2019.57.11.695

In this study, the microstructure-controlled Zn interlayers were synthesized to improve the adhesion strength of Zn/Zn-Mg double layer coatings. The coating chamber temperature and working pressure were controlled based on the Structure Zone Model principles, to obtain a dense columnar microstructure in the Zn interlayer. By controlling the coating chamber temperature, however, porous nanowire structures resulted in an increasing chamber temperature over 100 °C, suggesting that it was not possible to obtain a columnar microstructure of the Zn interlayer. On the other hand, it was possible to synthesize a dense columnar structure in the Zn interlayer by controlling the working pressure. Furthermore, by decreasing the working pressure during deposition, the density of Zn interlayer increased from 79.1% to 93.6%. A lap shear test was performed to evaluate the adhesion strength, and the adhesion strength of Zn /Zn-Mg double layer coatings increased from 20.38 MPa to 24.48 MPa as the density of the Zn interlayer increased. These adhesion strength results were higher than those of the commercial galvanized steels, suggesting that an additional improvement in the adhesion strength would be possible by controlling the microstructure of the Zn interlayer in the Zn/Zn-Mg double layer coatings. (Received August 27, 2019; Accepted September 25, 2019)