Corrosion and Oxidation Resistance of Electroless Ni-P-Al₂O₃ Composite Coatings on Carbon Steel

Abstract:

Electroless Ni-P and Ni-P-Al2O3 composite coatings on low carbon steel (Q235) sheets were prepared by adopting optimum plating process. The cross-section morphology and structure as well as the phase transformation of the composite coatings were studied by scanning electron microscopy(SEM), X-ray diffraction(XRD). It was shown that the Al2O3 particles homogeneously dispersed in the entire Ni-P film matrix, and the structure of Ni-P-Al2O3 composite coatings as deposited was amorphous. The corrosion behaviors were evaluated by electrochemical tests. The experimental results indicated that the corrosion resistance of Ni-P-Al2O3 coatings was superior to Ni-P coatings due to the effect of Al2O3 particles. In addition, the oxidation resistance test, which was carried out by using oxidation weight method, showed that ternary Ni-P-Al2O3 composite coating had a better oxidation resistance than Ni-P coating.

• Periodical: Applied Mechanics and Materials (Volumes 34-35)
• Pages: 831-835
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.34-35.831
• Online since: October 2010
• Authors: Wan Chang Sun, Ming Feng Tan, Jian Hua Lu, Lei Zhang, Quan Zhou
• Keywords: Composite Coating, Corrosion Resistance, Electroless Deposition, Oxidation Resistance

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