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硝酸根离子对U-0.79Ti合金腐蚀行为的抑制作用
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中国工程物理研究院材料研究所

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中国工程物理研究院科学技术基金(2015B0301063),中国工程物理研究院材料研究所特聘人才基金(TP02201704) ,中国四川省杰出青年科技基金(2017JQ0050)


The Inhibitive Effect of NO3- on the Corrosion Behavior of U-0.79wt.%Ti Alloy in NaCl Solution
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Science and Technology Development Foundation of China Academy of Engineering Physics (2015B0301063), Initiative Scientific Research Program of Materials Institute, CAEP (TP02201704) and Sichuan Science and Technology Development Foundation for Young Scientists (2017JQ0050).

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    摘要:

    采用电化学方法研究了硝酸根离子(NO3-)对U-0.79Ti合金在0.01 M NaCl溶液中腐蚀的抑制作用。实验证明,NO3-对U-0.79Ti合金在含氯离子(Cl-)溶液中的腐蚀具有抑制作用,且与NO3-浓度密切相关。当NO3-与Cl-浓度比大于0.1时,NO3-能够有效抑制U-0.79Ti合金点蚀的发生;而低于这个比例时,NO3-对U-0.79Ti合金的腐蚀行为几乎无影响。从电化学过程来看,加入NO3-能够降低浓差极化并增大极限扩散电流密度。同时,NO3-能够降低氧化膜的阳极活性溶解速度,提高U-0.79Ti合金的点蚀电位。表面划痕实验则表明,NO3-的抑制作用很可能缘于其优先于Cl-在表面缺陷处吸附,阻碍了Cl-的点蚀成核。

    Abstract:

    The inhibitive effect of NO3- on the corrosion behavior of U-0.79wt.%Ti alloy in 0.01 M NaCl solution was studied by electrochemical methods. The experiment results show that NO3- ions possess inhibitive effect on the corrosion of U-0.79wt.%Ti alloy in the solution containing Cl- ions, which has a close relationship with the concentration of NO3-. When the concentration ratio of NO3- and Cl- exceeds 0.1, NO3- could inhibit the appearance of the pitting on U-0.79 wt.%Ti alloy effectively; however, when the ratio is less than 0.1, NO3- show hardly any inhibitive effect on the corrosion behavior of U-0.79 wt.%Ti alloy. In the viewpoint of electrochemical process, the NO3- could increase the open circuit potential (OCP) of the alloy and lower the concentration polarization, meanwhile, increase the limited diffusion current density. At the same time, NO3- could also lower the rate of active anode dissolution, and increase the pitting corrosion potential of U-0.79 wt.%Ti alloy. The surface scratches experiments exhibit that the inhibitive effect of NO3- may root from that the NO3- ions have precedence over Cl- ions in being absorbed at the surface defects, which would inhibit the nucleation of pitting corrosion.

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蔡定洲,陈向林,吴昊曦,王铭,杨善丽,桑格,李英儒.硝酸根离子对U-0.79Ti合金腐蚀行为的抑制作用[J].稀有金属材料与工程,2020,49(1):101~108.[Cai Dingzhou, Chen Xianglin, Wu Haoxi, Wang Ming, Yang Shanli, Sang Ge, Li Yingru. The Inhibitive Effect of NO3- on the Corrosion Behavior of U-0.79wt.%Ti Alloy in NaCl Solution[J]. Rare Metal Materials and Engineering,2020,49(1):101~108.]
DOI:10.12442/j. issn.1002-185X.20180888

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  • 收稿日期:2018-08-26
  • 最后修改日期:2018-12-25
  • 录用日期:2019-01-09
  • 在线发布日期: 2020-02-16
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