Influence of particle size on the microstructure, hardness and corrosion resistance of electroless Ni-P-Al2O3 composite coatings13;

Balaraju, JN and Kalavati, and Rajam, KS (2006) Influence of particle size on the microstructure, hardness and corrosion resistance of electroless Ni-P-Al2O3 composite coatings13;. Surface and Coatings Technology, 200 (12-13). pp. 3933-3941.

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Abstract

High phosphorus electroless nickel bath has been used to prepare composite coatings containing alumina powders (50 nm, 0.3 amp;mu;m and 1.0 amp;mu;m). Deposits were characterized for its structure, morphology and hardness. Incorporation of particle has a marginal influence on the composition. More amount of particle incorporation and uniform distribution was found in composite coatings obtained with 1.0-amp;mu;m (C3) alumina particles compared to 50-nm (C1) and 0.3-amp;mu;m (C2) alumina particles. XRD results showed a broad peak of nickel and low intensity alumina peaks present in C3 composite coating in as-plated condition. A marginal improvement in hardness was noticed in as-plated composite coatings. A 15% increase in microhardness was observed in the heat-treated (400 amp;deg;C for 1 h) composite coatings. Potentiodynamic polarization measurements made on these deposits in 3.5% sodium chloride solution showed that uniform corrosion occurred in C1 and C2 composite coatings whereas localized corrosion was observed in C3 composite coating.

Item Type: Journal Article
Uncontrolled Keywords: Potentiodynamic;Alumina particles
Subjects: AERONAUTICS > Aerodynamics
Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
Depositing User: M/S ICAST NAL
Date Deposited: 21 Mar 2007
Last Modified: 08 Jul 2010 11:56
URI: http://nal-ir.nal.res.in/id/eprint/4058

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