INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF Ni-P/NANO-Al2O3 COMPOSITE COATING

J Chin Soc Corr Pro

2011, Vol. 31

Issue (3): 179-183 DOI:

Research Articles

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INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF Ni-P/NANO-Al₂O₃ COMPOSITE COATING

PENG Chengzhang, ZHU Lingling

Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201

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Abstract The Ni-P/nano-Al₂O₃ composite coating on Q235 steel was prepared by pulse electroplating, the composite coatings were heat-treated at temperature of 200-400 ℃. The microstructure of the composite coatings was identified by X-ray diffraction, the corrosion behavior of the composite coatings in 3.5% NaCl and 10% H₂SO₄ solutions was studied by the linear polarization measurements and scanning electron microscope (SEM). The results show that nano-Al₂O₃ particles retard precipitating of Ni₃P phase in composite coating, the crystallization temperature of the composite coating is higher than that of Ni-P alloy coating. The as-deposited and after 300℃ heat-treated composite coatings revealed better corrosion resistance in two corrosive solutions. The corrosion resistance of after 400℃ heat-treated composite coatings decreased. The corrosion behavior is pitting corrosion.

Key words: heat treatment pulse electroplating Ni-P/nano-Al₂O₃ composite coating corrosion resistance

Received: 06 December 2010

ZTFLH:

TG176

Corresponding Authors: PENG Chengzhang E-mail: pcz2002@sohu.com

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PENG Chengzhang, ZHU Lingling. INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF Ni-P/NANO-Al₂O₃ COMPOSITE COATING. J Chin Soc Corr Pro, 2011, 31(3): 179-183.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I3/179

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