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选用球形雾化镁粉作为原料,碳酸氢铵做造孔剂,采用粉末冶金法制备出孔径和孔隙率可控的多孔镁。研究了不同孔隙率的多孔镁在仿生体液(SBF)中的腐蚀性能,以及通过碱处理和碱热处理对多孔镁进行表面改性,以提高其在仿生体液中的耐腐蚀性。通过XRD、SEM分别对所制备的多孔镁及表面处理后样品的物相组成、微观形貌进行分析。结果表明:制备的多孔镁具有联通孔、孔径和孔隙率可控等优异性能;多孔镁的腐蚀速率随孔隙率的增加而增高;通过碱处理和碱热处理等表面改性,均有效的提高了试样的耐腐蚀性能,但碱热处理效果最佳。
Use spherical atomized magnesium powder as raw material, ammonium bicarbonate as pore-forming agent, prepared by powder metallurgy method porous and controlled porosity porous magnesium. The corrosion behavior of porous magnesium with different porosity in biomimetic body fluid (SBF) was investigated, and the surface modification of porous magnesium by alkali treatment and alkali heat treatment was carried out to improve its corrosion resistance in bionic fluid. The phase composition and microstructure of the prepared porous magnesium and the surface treated samples were analyzed by XRD and SEM respectively. The results show that the prepared porous magnesium has excellent properties such as interconnected pores, controlled pore size and porosity; the corrosion rate of porous magnesium increases with the increase of porosity; surface modification by alkali treatment and alkali heat treatment are effectively improved Corrosion resistance of the sample, but the best alkali heat treatment.