Na2WO4가 포함된 전해액에서 플라즈마 전해산화 처리된 알루미늄 합금 산화층의 기계적 특성

• Published in: 대한금속·재료학회지, 53(8) Vol. 53; no. 8; pp. 535 - 540
• Main Authors: 양해웅, Hae Woong Yang, 김연성, Yeon Sung Kim, 박주현, Joo Hyun Park, 김계원, Gye Won Kim, 고영건, Young Gun Ko, 신동혁, Dong Hyuk Shin
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 31.08.2015; 대한금속·재료학회
• Subjects: Al alloy; coating; mechanical properties; plasma electrolytic oxidation; scanning electron microscopy; SEM; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.8.535

This paper investigates with the mechanical properties of Al alloy samples coated by plasma electrolytic oxidation (PEO) using a phosphate electrolyte with a Na2WO4 solution. Under an A Ccondition of 60Hz, PEO coatings were applied for 300 seconds at a current density of 100mA/cm2. Microstructural observations of the PEO-coated samples revealed that the size and fraction of the micro-pores remained nearly constant while WO3 and W were additionally in corporated in the oxide layer using the Na2WO4 solution. During PEO coating, the Na2WO4 solution dissociated into Na+ and WO4 2- and the high dielectric voltage exceeding the ignition voltage activated the electrochemical reactions of WO4 2- in the anode, leading to the formation of WO3 and W. The incorporation of WO3 and W is expected to lead to enhancement of the hardness and wear resistance of the PEO-coated Al sample. (Received October 08, 2014)