후열처리에 의한 알루미늄 산화층의 특성 향상

• Published in: Biuletyn Uniejowski Vol. 52; no. 5; pp. 275 - 281
• Main Authors: 전윤남(Yoonnam Jeon), 김상준(Sangjun Kim), 박지현(Jihyun Park), 정나겸(Nagyeom Jeong)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2019
• Subjects: 기계공학; Aluminum; Sulfuric acid anodizing; heat treatment
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2019.52.5.275

Anodization is widely used to enhance the properties of aluminum, such as hardness, electric resistance, abrasion resistance, corrosion resistance etc. But these properties can be enhanced with additional process. According to the partial crystallization of oxide layer with post heat treatment, enhanced hardness can be expected with partial crystallization. In this study, post heat treatments were applied to the anodized aluminum alloys of Al6061 to achieve the partial crystallization, and crystallizations were evaluated with the reduced breakdown voltages. Interestingly, remarkable enhanced hardness (21~29%), abrasion resistance (26~62%), and reduced breakdown voltage (24~44%) were observed for the sulfuric acid anodized samples when we annealed the anodized samples with 1hour post heat treatment at $360^{\circ}C$. For the Al5052 alloys, a lot of cracks were observed when we applied the post heat treatment.