The effect of Nb addition on mechanical properties, corrosion behavior, and metal-ion release of ZrAlCuNi bulk metallic glasses in artificial body fluid.
The effect of Nb addition on mechanical properties, corrosion behavior, and metal-ion release of ZrAlCuNi bulk metallic glasses in artificial body fluid.
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DOI：
10.1002/jbm.a.30502
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
C. Qiu;L. Liu;M. Sun;S. Zhang
中科院分区：
文献类型：
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作者：
C. Qiu;L. Liu;M. Sun;S. Zhang
采用铜模铸造法制备了Zr(65 - x)Nb(x)- Cu(17.5)Ni(10)Al(7.5), Nb = 0、2和5 at %的大块金属玻璃。压缩试验结果表明，两种含Nb的bmg合金的强度和塑性均优于基体合金。通过电化学测量研究了所得合金在人工体液中的腐蚀行为。结果表明，Nb的加入显著提高了zr基BMG的耐蚀性，腐蚀电位和点蚀电位均有显著提高。XPS分析表明，含Nb的bmg在阳极极化后形成的钝化膜中铝离子富集，磷酸盐离子缺失，这是其耐蚀性提高的原因。另一方面，采用电感耦合等离子体质谱法（ICP-MS）测定不同BMGs在37℃人工体液中浸泡20 d后的金属离子释放量（PPb (ng/mL)）水平。结果表明，Nb的加入大大降低了碱系中各种金属的离子释放。这可能是由于Nb对高保护膜的快速形成有促进作用。
Bulk metallic glasses (BMGs) of Zr(65 - x)Nb(x)- Cu(17.5)Ni(10)Al(7.5) with Nb = 0, 2, and 5 at % were prepared by copper mold casting. Compression tests reveal that the two BMGs containing Nb exhibited superior strength and plasticity to the base alloy. The corrosion behavior of the alloys obtained was investigated in artificial body fluid by electrochemical measurements. It was found that the addition of Nb significantly enhanced the corrosion resistance of the Zr-based BMG, as indicated by a remarkable increase in corrosion potential and pitting potential. XPS analysis revealed that the passive film formed after anodic polarization was enriched in aluminum oxide and depleted in phosphate ions for the BMGs containing Nb, which accounts for the improvement of corrosion resistance. On the other hand, metal-ion release of different BMGs were determined in PPb (ng/mL) level with inductively coupled plasma mass spectrometry (ICP-MS) after being immersed in artificial body fluid at 37 degrees C for 20 days. It was found that the addition of Nb considerably reduced the ion release of all kinds of metals of the base system. This is probably attributed to the promoting effect of Nb on a rapid formation of highly protective film.