Formation and Characterization of Ceramic Nanocomposite Crystalline Coatings on Aluminium by Anodization

作     者：M.Mubarak Ali V.Raj 

作者机构：School of Chemical EngineeringYeungnam UniversityGyeongsanGyeongbuk 712-749South Korea Advanced Materials Research LaboratoryDepartment of ChemistryPeriyar UniversitySalem 636 011Tamil NaduIndia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2013年第29卷第7期

页      面：595-602页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the Council of Scientific and Industrial Research  New Delhi for awarding CSIR-SRF(senior research fellow ship- 09/810(0011) 2010 EMR) 

主　　题：Anodization Nanocomposite Coatings Alumina Aluminium 

摘      要：Ceramic nanocomposite coatings have been synthesized on aluminium by using lithium sulphate electrolyte with zirconium silicate additive by anodization. The effects of current density （CD） on microhardness, structure, composition and surface topography of the oxide layer formed at various CDs （0.1-0.25 A/cm^2） have been studied. Crystalline coatings formed at 0.25 A/cm^2 have been （width 95 nm） observed with a relatively uniform distribution confirmed by scanning electron microscopy. Additionally, the average microhardness value of ceramic nanocomposite coatings fabricated from lithium sulphate-zirconium silicate bath is approximately 8.5 times higher than that of the as-received aluminium. The surface statistics of the coatings is discussed in detail to explain the roughness and related parameters for better understanding. These observations demonstrate the importance of surface statistics in controlling the morphology of the coatings and its properties. From the X-ray diffraction investigations, it can be concluded that the formed nanocomposite coatings are crystalline in nature and that the crystallinity of the coatings decreases with increasing applied current density.