Particle-Size-Dependent Anticorrosion Performance of the Si3N4-Nanoparticle-Incorporated Electroless Ni-P Coating

Coatings

Soo Wohn Lee¹  Hak Soo Kim¹  Hak Hee Kim¹  Bina Chaudhary²  Yoseb Song³  Bum Sung Kim³  Tae-Ho Kim⁴  Dhani Ram Dhakal⁴  Yuwaraj K. Kshetri⁴ 

[1] Department of Environmental and Biochemical Engineering, Sun Moon University, Asan-si 31460, Korea;Department of Fusion Science and Technology, Sun Moon University, Asan-si 31460, Korea;Korea Institute for Rare Metals, Korea Institute of Industrial Technology, Incheon 21999, Korea;Research Center for Eco Multi-Functional Nano Materials, Sun Moon University, Asan-si 31460, Korea;

关键词: electroless coating;    Si₃N₄ nanoparticles;    Ni-P-Si₃N₄ composite;    microstructure;    corrosion;   

DOI  :  10.3390/coatings12010009

来源: DOAJ

【 摘 要 】

Electroless Nickel–Phosphorus (Ni-P) coating is recognized mostly for its outstanding corrosion and wear-resistant behavior. The intrinsic corrosion and wear-resistant properties of Ni-P-based coating could be further upgraded by incorporating appropriate second-phase additive particles into the coating matrix. However, such properties of the Ni-P-based coating greatly rely on the surface and microstructural evolution arising with the co-deposition of the additive particles. In this study, submicron Si₃N₄ (average size ~200 nm) and nano Si₃N₄ (average size ~20 nm) particles were incorporated while depositing a Ni-P alloy in a low-carbon steel substrate to develop the Ni-P-Si₃N₄ composites through the electroless coating method. The 20 nm Si₃N₄-incorporated composite coating constituted fewer defects such as cavities and micropores on the surface, but such defects significantly appeared on the surface of the composite after the incorporation of 200 nm Si₃N₄ nanoparticles. Subsequently, the composite Ni-P-Si₃N₄, developed with the co-deposition of 20 nm nanoparticles, is enriched with enhanced anticorrosion characteristics compared with the composite developed with 200 nm nanoparticles. The enhancement of anticorrosion behavior was attributed mainly to the Si₃N₄ nanoparticles that covered the substantial volume of the coating and led to inhibit the formation of corrosion active sites such as defects and metallic Ni phase.

【 授权许可】

Unknown