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首页> 外文会议>International conference on nuclear chemistry for sustainable fuel cycles >Electrochemistry of actinides and selected fission products in the head end of spent nuclear fuel reprocessing
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Electrochemistry of actinides and selected fission products in the head end of spent nuclear fuel reprocessing

机译：耗尽核燃料再加工的磁性散热物和选定裂变产品的电化学

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The data on the uranium metal corrosion rate in the solutions of nitric acid (0,1 - 4 M) and effect of complex forming agents on uranium corrosion properties are presented. The increase of HNO_3 concentration caused the shift of corrosion potential from 38 mV to 446 mV and the increase of the corrosion rate from 0,02 to 0,62 mg cm~(-2)h~(-1). Transpassivation potential of U metal was found weakly effected by HNO_3 concentration varying from 448 to 470 mV / Ag/AgCl. The addition of HCOOH to the electrolytes containing less than 3 M HNO_3 found to shift the values of corrosion potentials about 500 mV towards negative direction reducing the passivation of U metal. The data on the kinetics of oxidative dissolution of PuO_2 using Ag(II) and Am(VI,V) as mediators and the effect of the mediator generation techniques are discussed. The electrochemical properties of UC in the solutions 2 - 4 M HNO_3, results of the quantitative determination of "oxidizable carbon" in dissolver solutions are presented. The results of corrosion and dissolution studies of Tc metal and Tc - Ru alloys containing from 19 to 70 at.% Ru in 0.5 0- 6 M HNO_3 indicate the formation of passive films of Tc(IV) - Ru(III,IV) hydroxides at the electrode surface in the solutions containing less than 2 M HNO_3 at the potentials less than 650 mV / Ag/AgCl. The increase of HNO_3 concentration to values exceeding 3 M and the shift of the electrode potential towards positive direction causes the transition of the Tc and Tc-Ru alloys to transpassive state. The values of transpassivation potentials increase with the increasing with HNO_3 coricentration. Quantitative dissolution of Tc metal without application of oxidation potential becomes possible in the electrolytes, containing more than 4 M HNO_3. The rate of Tc - Ru alloys dissolution is noticed to slow down with the increase of Ru content in the alloy.
机译：呈硝酸（0.1-4M）溶液中铀金属腐蚀速率的数据及复合成形剂对铀腐蚀性能的影响。 HNO_3浓度的增加导致腐蚀电位从38mV到446 mV的变化，并且腐蚀速率的增加从0.02至0,62mg cm〜（-2）H〜（-1）。通过448至470mV / Ag / AgCl，通过HNO_3浓度变化弱而发现U金属的过滤电位。将HCOOH添加到含有小于3M HNO_3的电解质中，发现腐蚀电位的值约为500mV朝向负方向降低U金属的钝化。讨论了使用Ag（II）和Am（vi，v）作为介质和介质产生技术的催化剂溶解动力学的数据。提出了UC在溶液2-4MHNO_3中的电化学性质，提出了溶解溶液中“可氧化碳”定量测定的结果。 TC金属和Tc - Ru合金的腐蚀和溶出研究含有19至70.％ru在0.5 0-6M HNO_3中表示TC（IV） - Ru（III，IV）氢氧化物无源膜的形成在含有小于2M HNO_3的溶液中的电极表面，电位小于650mV / Ag / AgCl。 HNO_3浓度的增加超过3μm的值和电极电位朝向正方向的偏移导致TC和TC-ru合金的转变为横向通道。随着HNO_3大理体的增加，过滤电位的值随着HNO_3的增加而增加。在没有施加氧化电位的情况下，在电解质中可以进行Tc金属的定量溶解，含有超过4mHNO_3的电解质。注意到TC - Ru合金溶解的速率随着合金中的Ru含量的增加而减缓。

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