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- Title
Enhanced wettability of zinc passivation layer by coating organic–inorganic multilayers.
- Authors
Shao, Xiao-Dan; Zhu, Li-Qun; Li, Wei-Ping; Chen, Hai-Ning; Liu, Hui-Cong
- Abstract
Zinc Cr(III) passivation layer (Zn-PL) could effectively protect NdFeB materials from corrosion. However, long-term exposure of Zn-PL to ambient atmosphere would reduce its wettability spontaneously, which hinders or deteriorates the adhesion of post-deposited materials. To solve this issue, a multilayer developed by layer-by-layer assembly approach was designed, and alumina sol and silica sol were prepared. A polyacrylic acid (PAA) layer was firstly deposited on Zn-PL to remove the preabsorbed organic carbon and form poly(zinc acrylate). Then, Al2O3 and SiO2 sol–gel layers were sequentially assembled on PAA-coated Zn-PL. As a result, the hydrophobic Zn-PL turns into super-hydrophilic by coating organic–inorganic multilayers, which is attributed to the surface enrichment of hydrophilic hydroxyl groups and increases surface roughness. Furthermore, the super-hydrophilic surface displays excellent adhesion property without the negative effect on its other properties, which highlights a good prospect for a wide application of NdFeB or other potential materials.
- Publication
Rare Metals, 2023, Vol 42, Issue 8, p2816
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-017-0989-3