期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 120, 期 2-3, 页码 656-660出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.12.012
关键词
Zirconium alloy; Plasma electrolytic oxidation; Ceramic coatings
资金
- Beijing Science and Technology Committee [9558102500]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry of China)
- Beijing Scientific Research Foundation for the Returned Overseas Chinese Scholars
Thick ceramic coatings were prepared on zirconium alloy by plasma electrolytic oxidation (PEO) in silicate electrolyte. Their microstructure and phase constituent were analyzed. The micromechanical properties of a thick coating are measured by nanoindentation method. The electrochemical corrosion behaviors of the coatings were evaluated by potentiodynamic polarization. The coating consists of the monoclinic ZrO(2) and tetragonal ZrO(2), but the tetragonal ZrO(2) content is much lower than the monoclinic ZrO(2) content. In the inner layer coating, the nanohardness and elastic modulus are much higher than that of the Zr substrate, and their maximum values reach 7.4 GPa and 170 GPa, respectively. However, the elastic modulus of the coating is lower than that of Zr substrate when the distance is far from the coating/Zr interface. After PEO treatment, the corrosion potential of zirconium alloy moves to a more positive potential, and the corrosion current density reduces several orders of magnitude. However, the corrosion current density increases again while the coating is very thick. PEO is an effective method to improve corrosion resistance of zirconium, especially for pitting attack. (C) 2009 Elsevier B.V. All rights reserved.
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