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 deterio...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 poly acrylic acid(PAA)layer was firstly deposited on Zn-PL to remove the preabsorbed organic carbon and form poly(zinc acrylate).Then,Al_(2)O_(3)and SiO_(2)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.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51371020)。
文摘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 poly acrylic acid(PAA)layer was firstly deposited on Zn-PL to remove the preabsorbed organic carbon and form poly(zinc acrylate).Then,Al_(2)O_(3)and SiO_(2)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.
