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Effect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation

Title
Effect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation
Other Titles
Na2WO4가 포함된 전해액에서 플라즈마 전해산화 처리된 알루미늄 합금 산화층의 기계적 특성
Author
신동혁
Keywords
Al alloy; coating; plasma electrolytic oxidation; mechanical properties; scanning electron microscopy(SEM); MICRO-ARC OXIDATION; CERAMIC COATINGS; ALUMINUM-ALLOY; CORROSION-RESISTANCE; GROWTH-MECHANISM; BEHAVIOR; FILMS
Issue Date
2015-08
Publisher
대한금속재료학회
Citation
대한금속재료학회지, v. 53, No. 8, Page. 535-540
Abstract
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/cm(2). 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 WO42- and the high dielectric voltage exceeding the ignition voltage activated the electrochemical reactions of WO42- 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.
URI
http://kiss.kstudy.com/thesis/thesis-view.asp?key=3338318https://repository.hanyang.ac.kr/handle/20.500.11754/101387
ISSN
1738-8228
DOI
10.3365/KJMM.2015.53.8.535
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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