EFFECT OF Cr PARTICLE SIZE ON THE OXIDATION BEHAVIOUR OF ELECTRODEPOSITED Ni-Cr COMPOSITE COATINGS

J Chin Soc Corr Pro

2006, Vol. 26

Issue (2): 85-88 DOI:

Research Report

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EFFECT OF Cr PARTICLE SIZE ON THE OXIDATION BEHAVIOUR OF ELECTRODEPOSITED Ni-Cr COMPOSITE COATINGS

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Abstract Ni-7.5Cr,、Ni-10.9Cr、Ni-12.4Cr composites were prepared by means of co-electrodeposition of Ni matrix with three kinds of Cr particles in average size of 21 nm,39 nm, and 2.4µm, respectively. Compared to the electrodeposited microparticles-dispered composite coating (EMCC), the electrodeposited nanoparticles-dispered nanocomposite coatings (ENNCs) exhibits more homogeneous distribution of Cr particles and the interparticle spacing is approximately two orders of magnitude lower. The ENNCs have a very low oxidation rate at 900℃, due to the rapid formation of a continuous and compact chromia scale, whereas the EMCC exhibits a very poor oxidation resistance, due to the formation of porous NiO scale. For the ENNCs, the finer the Cr particles codeposited, the better the oxidation performance. The particles size effect on the oxidation behaviour of electrodeposited Ni-Cr composites is also discussed.

Key words: Electrodeposition Ni-Cr composite coating particle size effect oxidation

Received: 16 March 2005

ZTFLH:

TG174.44

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;. EFFECT OF Cr PARTICLE SIZE ON THE OXIDATION BEHAVIOUR OF ELECTRODEPOSITED Ni-Cr COMPOSITE COATINGS. J Chin Soc Corr Pro, 2006, 26(2): 85-88 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I2/85

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