Luo, XuekunMeng, MengmengLi, RanLi, ZianCole, Ivan S.Chen, Xiao BoZhang, Tao2026-07-032026-07-030264-1275ORCID:/0000-0001-6582-1457/work/219176354https://hdl.handle.net/1885/733812516Pitting corrosion is a common localized corrosion phenomenon, which can lead to cracks and mechanical failure in structural metal materials. On the contrary, pitting corrosion could be a beneficial tool for generating large-area porous structures, which holds a great premise in a number of functional services, such as catalysis, sensing, storage, imprint lithography, and membranes. Herein we presents an electrochemical approach for creating a large-area honeycomb-like porous structure in Zr-based metallic glasses. A pitting process followed by subsurface tunnel etching in NaCl solution elicits to characteristic micrometer scale channels and nanometer size amorphous sidewalls decorated by Cu nanoparticles on the metallic glass substrate. A root-shape growing mechanism of tunnels initiated from pits and penetrating into alloy matrix is postulated. In addition, the effect of alloy composition on the microstructure of honeycomb-like porous metallic glasses is also investigated in detail.This work was supported by the National Key Research and Development Program of China ( 2018YFA0703600 ), the National Natural Science Foundation of China ( 51971006 and 51771008 ), Beijing Natural Science Foundation ( 2172034 ) and the Fundamental Research Funds for the Central Universities .enPublisher Copyright: © 2020 The AuthorsElectrochemical etchingGrowth mechanismMetallic glassPitting corrosionPorous material202010.1016/j.matdes.2020.10910985090286245