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硝酸根離子對U-0.79Ti合金腐蝕行為的抑制作用
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中國工程物理研究院材料研究所

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中國工程物理研究院科學(xué)技術(shù)基金(2015B0301063)，中國工程物理研究院材料研究所特聘人才基金(TP02201704) ，中國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:

    采用電化學(xué)方法研究了硝酸根離子（NO3-）對U-0.79Ti合金在0.01 M NaCl溶液中腐蝕的抑制作用。實驗證明，NO3-對U-0.79Ti合金在含氯離子（Cl-）溶液中的腐蝕具有抑制作用，且與NO3-濃度密切相關(guān)。當(dāng)NO3-與Cl-濃度比大于0.1時，NO3-能夠有效抑制U-0.79Ti合金點蝕的發(fā)生；而低于這個比例時，NO3-對U-0.79Ti合金的腐蝕行為幾乎無影響。從電化學(xué)過程來看，加入NO3-能夠降低濃差極化并增大極限擴散電流密度。同時，NO3-能夠降低氧化膜的陽極活性溶解速度，提高U-0.79Ti合金的點蝕電位。表面劃痕實驗則表明，NO3-的抑制作用很可能緣于其優(yōu)先于Cl-在表面缺陷處吸附，阻礙了Cl-的點蝕成核。

    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,陳向林,吳昊曦,王銘,楊善麗,桑格,李英儒.硝酸根離子對U-0.79Ti合金腐蝕行為的抑制作用[J].稀有金屬材料與工程,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
  • 錄用日期:2019-01-09
  • 在線發(fā)布日期: 2020-02-16
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