A Kelvin probe force microscopy study of hydrogen insertion and desorption into 2024 aluminum alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:722

Article

Lafouresse, Manon Chloe¹  de Bonfils-Lahovary, Marie-Laetitia¹  Charvillat, Cedric¹  Oger, Loic¹  Laffont, Lydia¹  Blanc, Christine¹ 

[1] Univ Toulouse, CIRIMAT, CNRS, INPT,UPS,ENSIACET, 4 Allee Emile Monso,CS44362, F-31030 Toulouse, France

关键词: Aluminum alloys;    Hydrogen absorption;    Hydrogen desorption;    Atomic Force Microscopy (AFM);    Scanning Kelvin Probe Force Microscopy;    (SKPFM);   

DOI  :  10.1016/j.jallcom.2017.06.143

来源: Elsevier

【 摘 要 】

Hydrogen was inserted into 2024 aluminum alloy by cathodic polarization in sulfuric acid at 25 degrees C. Scanning Kelvin Probe Force Microscopy (SKPFM) measurements performed perpendicularly to the charging side revealed a potential gradient and confirmed the insertion of hydrogen over hundreds of microns. A hydrogen diffusion coefficient of 1.7 x 10(-9) cm(2) s(-1) was calculated from SKPFM measurements of H-charged samples for different durations. The evolution of the potential gradient during desorption of hydrogen in air, at room temperature and at 130 degrees C was investigated. Additional experiments performed at a corrosion defect showed that SKPFM could detect both reversibly and irreversibly bounded hydrogen. These results show that SKPFM is a cutting-edge technique for hydrogen detection and localization at a local scale. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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