Oxidation and hot corrosion of electrodeposited Ni-7Cr-4Al nanocomposite  

Ni-7Cr-4Al纳米复合镀层的氧化和热腐蚀性能(英文)

作　　者：张海军[1] 孙俭峰[1] 

机构地区：[1]黑龙江科技大学材料科学与工程学院,哈尔滨150022

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第1期191-198,共8页中国有色金属学报（英文版）

基　　金：Project(11531319)supported by the Scientific Research Fund of Heilongjiang Provincial Education Department,China

摘　　要：A Ni-7Cr-4Al（mass fraction, %） nanocomposite was fabricated by co-electrodeposition of Ni with Cr（40 nm） and Al（100 nm） nanoparticles from a nickel sulfate bath, and its oxidation at 800 °C in air and hot corrosion under molten 75% Na2SO4 ＋ 25% Na Cl salts（mass fraction） at 750 °C were investigated. For comparison, Ni-11 Cr nanocomposite and Ni-film were also investigated in order to elucidate the effect of Cr nanoparticles. The results indicate that Cr and Al nanoparticles are dispersed in the electrodeposited nanocrystalline Ni grains（in size range of 20-60 nm）. Ni-7Cr-4Al nanocomposite exhibits a dramatically increased oxidation resistance compared with Ni-11 Cr nanocomposite and Ni-film due to the fast formation of alumina scale, which also improves its hot corrosion resistance under molten 75% Na2SO4 ＋ 25% Na Cl salts.采用复合电镀技术,通过向普通硫酸镍电镀液中加入纳米Cr和Al颗粒,在Ni基材上制备了一种Ni-7Cr-4Al（质量分数,%）纳米复合涂层,对其在800°C下的空气氧化和750°C下75%Na2SO4＋25%Na Cl混合熔盐热腐蚀性能进行研究。作为对比,对相同工艺制备的Ni-11Cr纳米复合镀层和纯Ni镀层的氧化和热腐蚀性能进行分析。Cr和Al纳米颗粒弥散分布在20~60 nm的纳米Ni中,与Ni-11Cr纳米复合镀层和纯Ni镀层相比,Ni-7Cr-4Al纳米复合镀层由于能快速形成氧化铝膜而表现出更优异的抗氧化性能,同时氧化铝膜的快速形成也提高了涂层的热腐蚀性能。

关 键 词：Ni-Cr-Al coating NANOCOMPOSITE co-electrodeposition OXIDATION hot corrosion 

分 类 号：TQ153[化学工程—电化学工业]