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金属学报  2015 

U-Co系非晶合金的形成与耐蚀性研究*

DOI: 10.11900/0412.1961.2014.00580, PP. 623-630

Keywords: 非晶合金,铀合金,快速凝固,耐腐蚀性能

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Abstract:

将U-Co二元系中的富U合金UxCo100-x(x=50~87.5)作为研究对象,采用电弧熔炼与甩带方法制备它们的母合金锭与薄带样品,通过XRD和DSC研究合金样品的相组成与稳定性,同时采用动电位极化方法研究非晶合金的耐腐蚀性能.结果表明,条带非晶形成的成分区间为58.5≤x≤78,其最佳成分出现在U66.7Co33.3附近;在20K/min加热速率下,U-Co非晶的晶化温度位于534~550K之间,晶化放热焓为4.8~8.5kJ/mol,约化晶化温度Trx值最高达0.535;在50×10-6Cl-溶液中,U-Co非晶合金的腐蚀电位大都接近-50mV,其抗腐蚀能力显著优于贫铀,且U-Co非晶耐腐蚀性与其形成能力显示出正相关性.

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