摘要
以Ni76Si24(质量百分数)合金粉末为原料,利用激光熔覆技术在A3钢表面制得了组织由条状Ni2Si初生相及少量Ni2Si/Ni3Si2共晶组成的新型金属硅化物合金涂层。分析涂层显微组织并测定其在0.5mol/lH2SO4水溶液及不同浓度NaCl水溶液中的阳极极化曲线。结果表明激光熔覆Ni2Si/Ni3Si2金属硅化物合金涂层表面平整、组织细小、与基体为完全冶金结合,同时由于涂层的组织组成相Ni2Si和Ni3Si2本身均具有极好的耐蚀性并具有快速凝固细小均匀的显微组织,该激光熔覆Ni2Si/Ni3Si2金属硅化物合金涂层在0.5mol/lH2SO4及3.5%NaCl水溶液中均具有优良的耐蚀性能。
A corrosion resistant Ni2Si/Ni3Si2 silicide alloy coating was fabricated on a substrate of low carbon steel A3 by laser cladding of the Ni76Si24 alloy powders: The laser clad silicide alloy coating has a rapidly solidified homogeneous microstructure consisting of plate-like Ni2Si primary phase and minor amount of Ni2Si/Ni3Si2 eutectics and is metallurgically bonded to the steel. substrate. The corrosion resistances of the silicide alloy coating in the water solutions of 0.5mol/l H2SO4 and 3.5% NaCl were evaluated utilizing the electrochemical polarization corrosion-test method. Because of the inherent excellent corrosion-resisting properties of the constituting phases Ni2Si and Ni3Si2, and the rapidly solidified homogeneous microstructure, the laser clad Ni2Si/Ni3Si2 silicide alloy coating exhibits excellent corrosion resistance.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第3期197-200,共4页
Rare Metal Materials and Engineering
