4.7 Article

Enhancing the long-term anti-corrosion property of Mg alloy by quaternary phosphonium salt: Integrated experimental and theoretical approaches

期刊

CORROSION SCIENCE
卷 178, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109010

关键词

Mg alloys; Corrosion inhibitor; Long-term resistance; Diffusion coefficient

资金

  1. National Natural Science Foundation of China [21676071, 21703053, 21975064]
  2. Program of Henan Center for Outstanding Overseas Scientists [GZS2020011]
  3. Henan University's first-class discipline science and technology research project [2018YLTD07, 2018YLZDYJ11, 2019YLZDYJ09]
  4. Henan University

向作者/读者索取更多资源

The corrosion resistance of two ionic liquids, [BPP][NTf2] and [OTP][NTf2], for Mg alloys in NaCl solution was explored, with [BPP][NTf2] showing better inhibition efficiency than [OTP][NTf2]. The inhibition performance of both liquids improved after long time immersion, although [OTP][NTf2] exceeded [BPP][NTf2] after 96h immersion. Molecular dynamics simulations elucidated the key factors affecting long-term inhibition performance, leading to a proposed inhibition mechanism based on XPS results and quantum chemical calculations.
The corrosion resistance of two ionic liquids, [BPP][NTf2] and [OTP][NTf2], for Mg alloys is explored in NaCl solution by electrochemical approach, SEM, XRD, and XPS measurements along with theoretical calculations. The inhibition efficiency of [BPP][NTf2] is better than that of [OTP][NTf2] in three tested NaCl solution. Their inhibition performance is improved after long time immersion. Moreover, the [OTP][NTf2] would exceed [BPP] [NTf2] after 96 h immersion. The essential item to affect the long-term inhibition performance is elucidated by the molecular dynamics simulations. The possible inhibition mechanism is proposed according to the XPS results along with the quantum chemical calculations.

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