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激光熔覆Ni2Si／Ni3Si2金屬硅化物合金涂層顯微組織與耐蝕性
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TG174.4 TG156.99

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Microstructure and Corrosion Resistance of Laser Clad Coating of Ni2Si/Ni3Si2 Silicide Alloy
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    摘要:

    以Ni76Si24（質(zhì)量百分?jǐn)?shù)）合金粉末為原料，利用激光熔覆技術(shù)在A3鋼表面制得了組織由條件Ni2Si初生相及少量Ni2Si/Ni3Si2共晶組成的新型金屬硅化物合金涂層，分析涂層顯微組織并測(cè)定其在0．5mol/1 H2SO4水溶液及不同濃度NaCl水溶液中的陽(yáng)極極化曲線，結(jié)果表明激光熔覆Ni2Si/Ni3Si2金屬硅化物合金涂層表面平整，組織細(xì)小，與基體為完全冶金結(jié)合，同時(shí)由于涂層的組織組成相Ni3Si2本身均具有極好的耐蝕性并具有快速凝固細(xì)小均勻的顯微組織，該激光熔覆Ni2Si/Ni3Si2金屬硅化物合金涂層在0．5mol/l H2SO4及3．5％NaCl水溶液中均具有優(yōu)良的耐蝕性能。

    Abstract:

    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.

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王春敏 蔡良續(xù) 等.激光熔覆Ni2Si／Ni3Si2金屬硅化物合金涂層顯微組織與耐蝕性[J].稀有金屬材料與工程,2003,(3):197~200.[Wang Chunmin, Cai Liangxu, Wang Huaming. Microstructure and Corrosion Resistance of Laser Clad Coating of Ni2Si/Ni3Si2 Silicide Alloy[J]. Rare Metal Materials and Engineering,2003,(3):197~200.]
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  • 最后修改日期:2001-07-13
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