TY - JOUR

T1 - Hydrogen absorption rate and hydrogen diffusion in a ferritic steel coated with a micro- or nanostructured ZnNi coating

AU - Moshtaghi, Masoud

AU - Safyari, Mahdieh

AU - Mori, Gregor

N1 - Funding Information: The authors appreciate helpful discussions and resources provided by Prof. S. Kuramoto, and F. Abbasi. Publisher Copyright: © 2021 The Authors

PY - 2022/1

Y1 - 2022/1

N2 - This study investigates the effect of the microstructure of electrodeposited ZnNi coatings, in particular pores and microcracks, on hydrogen diffusion characteristics at room temperature. The hydrogen permeation behavior and thermal desorption spectra of electrodeposited ZnNi micro- and nanostructured coatings were studied and compared. The microstructures of the coatings were observed using a scanning electron microscope. The results showed that the presence of microcracks significantly influences the hydrogen diffusion behavior: in microstructured ZnNi hydrogen can diffuse along the microcracks due to the large number of microcracks present, leading to higher hydrogen absorption during electrochemical charging. Also, the high grain boundary density in the nanostructured coating leads to the presence of a larger number of strong H traps, and thus lower diffusible H content.

AB - This study investigates the effect of the microstructure of electrodeposited ZnNi coatings, in particular pores and microcracks, on hydrogen diffusion characteristics at room temperature. The hydrogen permeation behavior and thermal desorption spectra of electrodeposited ZnNi micro- and nanostructured coatings were studied and compared. The microstructures of the coatings were observed using a scanning electron microscope. The results showed that the presence of microcracks significantly influences the hydrogen diffusion behavior: in microstructured ZnNi hydrogen can diffuse along the microcracks due to the large number of microcracks present, leading to higher hydrogen absorption during electrochemical charging. Also, the high grain boundary density in the nanostructured coating leads to the presence of a larger number of strong H traps, and thus lower diffusible H content.

KW - Defects

KW - Hydrogen absorption rate

KW - Hydrogen diffusion

KW - Nanostructured ZnNi coating

KW - Thermal desorption spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85121390119&partnerID=8YFLogxK

U2 - 10.1016/j.elecom.2021.107169

DO - 10.1016/j.elecom.2021.107169

M3 - Article

AN - SCOPUS:85121390119

VL - 134.2022

JO - Electrochemistry Communications

JF - Electrochemistry Communications

SN - 1388-2481

IS - January

M1 - 107169

ER -