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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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    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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[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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History
  • Received:August 26,2018
  • Revised:December 25,2018
  • Adopted:January 09,2019
  • Online: February 16,2020
  • Published: