CORROSION RESISTANCE OF ELECTROLESSNi COATINGS ON SiCp/Al COMPOSITE AND MECHANISM

J Chin Soc Corr Pro

2006, Vol. 26

Issue (3): 160-165 DOI:

Research Report

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CORROSION RESISTANCE OF ELECTROLESSNi COATINGS ON SiCp/Al COMPOSITE AND MECHANISM

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哈尔滨工业大学应用化学系

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Abstract Ni-P coatings were prepared on SiCp/Al composite by autocatalytic deposition and their corrosion behaviors in 3.5 % NaCl solution at 25℃ were studied by electrochemical impedance spectroscopy and potentiodynamic techniques.SEM、EDAX and XRD were also employed to examine the coatings so as to understand the corrosion mechanism of the coatings.The plating conditions show great influences on the P content of the coatings and thus the corrosion resistance.The P content of the coatings increases with decreasing the plating temperatures and pH values.The corrosion resistance of the coating can be increased significantly by increasing the P content of the coatings,which is ascribed to that the existence of P can improve significantly self passivation of the coatings in the solution.

Key words: Ni-P alloy coatings corrosion resistance P content mechanism SiCp/Al composite

Received: 16 March 2005

ZTFLH:

TG 153.1

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. CORROSION RESISTANCE OF ELECTROLESSNi COATINGS ON SiCp/Al COMPOSITE AND MECHANISM. J Chin Soc Corr Pro, 2006, 26(3): 160-165 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I3/160

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