固溶处理对可生物降解Mg-6Zn合金腐蚀性能的影响.pdfVIP

Trans. Nonferrous Met. Soc. China 25(2015) 1490−1499 Effect of solution treatment on corrosion characteristics of biodegradable Mg−6Zn alloy 1 1 Seyed Morteza Ghaffari SHAHRI , Mohd Hasbullah IDRIS , 2 1 1 Hassan JAFARI , Babak GHOLAMPOUR , Mahtab ASSADIAN 1. Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia; 2. Department of Materials Engineering, Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran 16785-136, Iran Received 30 May 2014; accepted 30 January 2014 Abstract: A binary Mg−6Zn biodegradable alloy was solution treated to evaluate the effects of resulting microstructure changes on the alloy’s degradation rate and mechanisms in-vitro. The treatment was conducted at 350 °C for 6−48 h. Optical and scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction were used to analyze the as-cast and treated samples. Immersion and electrochemical tests were performed in simulated body fluid at 37 °C to assess the samples corrosion resistance. To confirm the results of the corrosion tests, pH measurement was carried out. It is found that over 24 h solution treatment dissolves intermetallic phases in matrix and produces an