【作者】 李声泽；

【Author】 Li Sheng-ze Southwest-china Normal University 400715

【机构】 西南师范大学；

【摘要】 通过在瓦特浴中加入微米、亚微米和纳米粉体,对比研究了纯镍、纳米镍和几种粒度的γ,α—Al₂O₃-Ni复合镍镀层的耐蚀性、高温抗氧化性和硬度。将电沉积所得的α-Al₂O₃弥散复合镍镀层,在多种腐蚀介质中进行对比耐蚀实验表明,其耐蚀性、高温抗氧化性及硬度均具有如下规律:纳米分散相的加入将使镀层金属晶体细化;纳米复合镀层较之纯镍、微米复合镍耐蚀性和高温抗氧化性都有大幅度提高;镀层的硬度按以下顺序降低:纳米α—Al₂O₃复合镍>纳米γ-Al₂O₃复合镍>亚微米α—Al₂O₃复合镍>纳米晶镍>微米复合镍>瓦特镍。镀液中分散相浓度越高复合镀层的硬度也越高。更多还原

【Abstract】 Composite Ni-Al₂O₃ films have been formed by co-deposition in a typical Watts bath.These films were composed of a nickel matrix embedded with 32nm（γ）, 34nm（α）, 0.35um（α）and 1.09um（α） diameter alumina particles. A considerable enhancements in corrosionperformance to HNO₃（1:1）, HCl（1:1）, hot-oxidation and hardness relative to pure nickel, micro-,submicrocomposites films were observed in the nanocomposites. It was found that both the α-, andγ-alumina nanoparticles addition promotes the development of very fine grained nickel coatingsand that hardness enhancements were as follows α-Al₂O₃ nanocomposites>γ-Al₂O₃nanocomposites>α—Al₂O₃ nanocomposites>nanocrystalline Ni>α—Al₂O₃microcomposites>Watts Ni. It is concluded that Ni-Al₂O₃ nanocomposites coatings are strongcontenders for applications requiring good corrosion protection and high hardness wearresisitance.更多还原