本文選題：燒結(jié)釹鐵硼 + 永磁材料　； 參考：《材料熱處理學報》2017年12期

【摘要】：采用環(huán)境友好的硅烷化處理技術(shù)在燒結(jié)釹鐵硼磁體表面制備一層硅烷轉(zhuǎn)化膜,對燒結(jié)釹鐵硼磁體進行暫時性防護。采用正交試驗對過程中的工藝參數(shù)進行優(yōu)化。采用冷場發(fā)射掃描電子顯微鏡(SEM)、拉力試驗機、動電位極化曲線及中性鹽霧試驗(NSS)對所制備的硅烷轉(zhuǎn)化膜的形貌、膜/基體之間結(jié)合力以及耐腐蝕性能進行研究。結(jié)果表明:硅烷轉(zhuǎn)化膜均勻的涂覆在燒結(jié)Nd Fe B磁體表面,涂層致密性高、無孔隙、裂紋等缺陷。硅烷轉(zhuǎn)化膜與基體之間的膜/基結(jié)合力強度可達14.14 MPa。薄膜耐中性鹽霧試驗可達12 h,硅烷轉(zhuǎn)化膜在固化過程中醇基之間脫水縮合反應使硅烷轉(zhuǎn)化膜表面形成具有不同交聯(lián)密度的區(qū)域,在Na Cl溶液中交聯(lián)密度低的區(qū)域首先水解溶解是造成磁體表面硅烷轉(zhuǎn)化膜腐蝕失效的主要原因。
[Abstract]:A layer of silane conversion film was prepared on the surface of sintered NdFeB magnets by using environmentally friendly silane treatment technology to protect the sintered NdFeB magnets temporarily.The process parameters were optimized by orthogonal test.The morphology, adhesion and corrosion resistance of silane conversion films were studied by means of cold field emission scanning electron microscope (SEM), tensile force tester, potentiodynamic polarization curve and neutral salt spray test (NSS).The results show that the silane conversion film is uniformly coated on the surface of sintered ND Fe B magnets, and the coating has high compactness, no porosity, crack and other defects.The binding strength of the film / base between the silane conversion film and the substrate is 14.14 MPA.The neutral salt spray resistance of the film can be up to 12 h. During the curing process of the silane conversion film, the dehydration and condensation reaction between the alcohols resulted in the formation of different cross-linking densities on the surface of the silane conversion film.The main reason for the corrosion failure of silane conversion film on magnetic surface is the hydrolysis and dissolution in the region with low crosslinking density in NaCl solution.
【作者單位】： 合肥工業(yè)大學工業(yè)與裝備技術(shù)研究院;稀土永磁材料國家重點實驗室(安徽大地熊新材料股份有限公司);合肥工業(yè)大學材料科學與工程學院;
【基金】：中國博士后科學基金(2017M612065) 安徽省重點研究與發(fā)展計劃項目(1704a0902020)
【分類號】：TB304
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本文編號：1760266