In situ XRD characterization of hydrogen desorption from electrochemically deposited Pd coating

被引：8
作者：
Borgese, L. [1 ,2 ]
Zanola, P. [1 ,2 ]
Bontempi, E. [1 ,2 ]
Rossi, D. [3 ]
Depero, L. E. [1 ,2 ]
机构：
[1] Univ Brescia, INSTM, I-25123 Brescia, Italy
[2] Univ Brescia, Chem Technol Lab, I-25123 Brescia, Italy
[3] Coventya SrL Auromet Div, I-51031 Agliana, PT, Italy
来源：
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH | 2010年 / 7卷 / 06期
关键词：
X-ray diffraction; Palladium; Electrochemistry; Coatings; Residual stress; EXPLORING LATTICE-DEFECTS; SUPERABUNDANT VACANCIES; PALLADIUM; ALLOYS; SEGREGATION; SOLUBILITY;
D O I：
10.1007/s11998-010-9253-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
One of the main problems in electrochemical Pd deposition of coatings is the hydrogen desorption that causes microcracking phenomena. With the aim of understanding the structural changes due to the hydrogen desorption, the kinetics of the phase transformation from hydride to metallic structure has been followed by in situ X-ray diffraction (XRD) experiments. The structural evolution of samples obtained by two different electrochemical baths has been compared. It was found that the solubility and the desorption kinetics of hydrogen are significantly influenced by the presence of structural defects. Residual stresses have been evaluated for both samples by means of 2D X-ray diffraction (XRD2). The presence of amine complexes in the bath seems to contribute to reducing the crystalline dimension of the Pd-phase, and the differences between the specific volumes of alpha and beta phases is reduced for nanostructured coatings.
引用
收藏
页码：691 / 695
页数：5
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