Effects of Content of Al₂O₃ Particles and Heat Treatment on Corrosion Resistance of Ni-P-Al₂O₃ Composite Coatings

Abstract:

Ni-P-Al2O3 composite coatings with the uniform distribution of Al2O3 particles were prepared by adding Al2O3 particles into Ni-P plating solution and adopting optimum plating process. The morphology and microstructure of the coatings were investigated by using SEM, EDS and XRD. Being immersed in 10 vol.% H2SO4 solutions, the corrosion resistance of Ni-P-Al2O3 composite coatings was tested. The results show that when the solubility of Al2O3 particles in plating solution is 8 g/l, the corrosion resistance is best. Comparing with as-plated Ni-P-Al2O3 composite coatings, the corrosion resistance of heat-treated Ni-P-Al2O3 composite coatings decreases by raising the temperature to 300°C and then increases by raising the temperature to 450°C.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 441-443
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.441
• Online since: April 2010
• Authors: Jian Hua Lu, Wan Chang Sun, Ming Zhu, Ming Feng Tan, Quan Zhou
• Keywords: Al₂O₃ Particle, Composite Coating, Corrosion Resistance, Heat Treatment

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