Alkaline etching of diffusion zinc coatings NiZn and CoZn as promising electrocatalysts for hydrogen evolution reaction

• DOI: 10.5599/jese.2519
• Publication Date: 2024-11-19T06:53:49Z
• Authors: Natalya Amelina; Daria Zakharova; Alexander Biryukov; Dmitry Zakharyevich; Maxim Ulyanov

Coatings based on NiZn and CoZn alloys were obtained by combining electrodeposition diffusion galvanizing methods. The coatings are homogeneous uniform, the zinc concentration is between 85.0 to 89.5 at. %, consist of intermetallic phases CoZn, mainly γ-Ni2Zn11 γ2-CoZn13. Alkaline etching accompanied selective dissolution zinc, rate increases with time. This dealloying a change in morphology - cracks, pits, pores considerable depth formed. These defects contribute formation galvanic coupling coating substrate, which leads an increase rate. electrochemical behavior after alkaline cathodic hydrogen evolution reaction was studied. current 1.5 3 times compared before etching. effect greater Ni-based coatings. Diffusion galva­nizing followed promising method for creating electrode materials electrolysis evolution.