摘要
应用电刷镀技术,以快速镍镀液制备了镍纳米镀层;用X射线衍射仪和原子力显微镜分析了经不同温度下热处理后的镍刷镀层的结构和晶粒尺寸,并测定了刷镀层的显微硬度和耐磨性能.结果表明:镀层的晶粒大小随热处理温度的升高先降低而后增大,经300℃热处理后的镍纳米镀层的晶粒尺寸小于30nm;镍镀层在300℃左右热处理时表现出较明显的强化趋势,相应镀层的晶粒尺寸最小、硬度最大;而镀层的耐磨性随热处理温度的变化与镀层的硬度略有不同,经200℃热处理后的镍镀层的耐磨性能最好.
Nickel-based nanocoatings were prepared on AISI-1045 steel sheet by electro-brush plating. The average grain size and microstructure of the nickel nanocoatings heated at different temperatures for 2 h were examined by means of X-ray diffraction and atomic force microscopy. The microhardness and wear behavior of the nanocoatings were investigated. The worn surface morphologies of the nanocoatings were observed using a scanning electron microscope. It was found that the average grain size, the hardness, and wear-resistance of the Ni-based nanocoatings were greatly dependent on the heat treatment temperature. Namely, the heat treatment at a proper temperature led to a decrease in the grain size of the Ni-based nanocoatings, while the hardness and wear-resistance of the nanocoatings were greatly increased after the heat treatment. This led to a change in the wear mechanisms of the untreated and heat-treated nanocoatings as well. In other words, the untreated Ni-based electro-brush plating coating was dominated by severe adhesion wear and scuffing, while the coating heated at 300°C for 2 h was dominated by brittle cracking. Moreover, the Ni-based electro-brush plated coating heated at 300°C for 2 h had an average grain size below 30 nm and the largest hardness, while the nanocoating heated at 200°C for 2 h had the best wear-resistance. The increased hardness and wear-resistance of the Ni-based electro-brush plated coating were attributed to the decreasing in the grain size and increase in the compactness of the coating after proper heat treatment.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2005年第2期112-116,共5页
Tribology
基金
国家重点基础研究项目资助(G19990650)
国家杰出青年基金资助项目(59925513).
关键词
电刷镀
镍基纳米镀层
显微硬度
耐磨性能
Atomic force microscopy
Grain size and shape
Heat treatment
Metallographic microstructure
Microhardness
Nanostructured materials
Nickel plating
Scanning electron microscopy
Wear resistance
