吕俊霞
,
张吉亮
,
石灿鸿
稀有金属材料与工程
通过浸泡法和电化学腐蚀法研究了(Ni8Nb5)99.5Sb0.5非晶在1,6mol/L HCl,1 mol/L H2SO4和3％ NaCl(质量分数)溶液中的腐蚀行为,对相应的组分金属Ni,Nb和Sb的腐蚀行为进行了比较.钝化膜的稳定性使用恒电位法和XPS深度剖析进行了研究,电化学极化测试后用扫描电镜观察了合金的表面形貌.结果表明,Ni-Nb-Sb合金在1 mol/L HCl,1 mol/L H2SO4和3％ NaCl(质量分数)溶液中具有良好的抗腐蚀性,在6 mol/L HCl溶液中,非晶合金的抗腐蚀性较差.在含有氯的介质中,电化学腐蚀后非晶合金表面被晶化,且有过钝化溶解.对钝化膜的稳定性研究表明,在低电压下,钝化膜的生长是由扩散控制的,而在高电压下,则主要呈活化腐蚀.
关键词:
Ni-Nb合金
,
非晶
,
腐蚀
,
钝化膜
By FENG Benzheng YANG Deqing Institute of Precious Metals
,
Kunming
,
650221
,
Yunnan
,
China.Physics Department
,
Yunnan University
,
Kunming
,
China.To whom correspondence should be addressed.
材料科学技术（英文）
The work functions before and after crystallization of two glassy alloys,Pd_(83.5)Si_(16.5) and Cu_(70)Ti_(30) have been measured by means of the con- tact potential difference method in the secondary electron field at room temperature under 10~(-5) Pa vacuum.The results show that the work functions of both glassy alloys are higher than those of the corresponding crystalline alloys.
关键词:
work function
,
null
,
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