title: Research on the corrosion resistance and formation of double-layer calcium phosphate coating on AZ31 obtained at varied temperatures.
abstract: In this study, the effect of varied processing temperatures on the corrosion resistance and formation of dual-layer calcium phosphate coating on AZ31 was investigated. The microstructure, phase and morphology were characterized by a scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffractometer (XRD), respectively. The in vitro degradation behavior of coated AZ31 samples were evaluated by electrochemical and immersion tests in simulated body fluid. The results showed that the varied processing temperatures responded to different microstructure, phase and morphology; and a dual-layer coating was formed during the deposition process at 70°C. Meanwhile the higher processing temperature induced a faster coating formation rate and greater surface coverage. The in vitro degradation tests in simulated body fluid indicated that the corrosion rates of AZ31 alloy were effectively decreased with increasing processing temperature, which was attributed to the denser protective coating. The formation mechanism of dual-layer coating influenced by deposition temperature was proposed.
authors.affiliation: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China; Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
authors.forename: Yanjin
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wan
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
authors.forename: Bingchun
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Tan
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. Electronic address: kyang@imr.ac.cn.
authors.forename: Ke
authors.initials: K
authors.lastname: Yang
authors.affiliation: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou 350002, China. Electronic address: franklin@fjirsm.ac.cn.
authors.forename: Jinxin
authors.initials: J
authors.lastname: Lin
mesh_terms: D001826:Body Fluids; D002130:Calcium Phosphates / Q000737:chemistry*; D003343:Corrosion; D008855:Microscopy, Electron, Scanning; D008954:Models, Biological; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates; C020243:calcium phosphate
keywords: Calcium phosphate; Chemical deposition; Coating; Degradation; Magnesium alloy