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论文类型：期刊论文

发表时间：2014-12-05

发表刊物：International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM)

收录刊物：SCIE、CPCI-S、Scopus

卷号：615

期号：S1

页面范围：S660-S665

ISSN号：0925-8388

关键字：Bio-corrosion resistance; Ni-free Zr-based bulk metallic glass; Nitrogen plasma immersion ion; implantation; Pitting corrosion

摘要：Improving the resistance of bulk metallic glass (BMG) to corrosion, particularly pitting, is crucial to the further development of this material. This study employed surface treatment based on nitrogen plasma immersion ion implantation (N-PIII) to enhance the bio-corrosion resistance of Ni-free Zr62.5Cu22.5Fe5Al10 BMG for application in bone implants. Resistance to bin-corrosion was evaluated by establishing potentiodynamic polarization curves in artificial saliva (AS) and simulated body fluid (SBF). Commercial pure Ti was used as the control. Results demonstrate that N-PIII treatment did not alter the bulk amorphous structure of Zr62.5Cu22.5Fe5Al10 BMG. Following N-PIII treatment, a nitride-containing 15 nm thick oxide film was formed on the BMG. This film significantly improved resistance to bio-corrosion in both AS and SBF solutions. The N-PIII-treated BMG presented lower corrosion rates (50-67% less) and higher corrosion potential (800-1100 mV more) than that observed in untreated BMG and Ti. The N-PIII treatment also significantly improved resistance of the BMG to pitting (increased pitting potential by 500-700 mV). This is the first report of the outstanding resistance of Ni-free Zr-based BMG to bin-corrosion (i.e. corrosion rate 0.01 mu A/cm(2); pitting potential >1200 my; corrosion potential >270 mV) in simulated biological environments. (C) 2014 Elsevier B.V. All rights reserved.