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51317--9806-Corrosion Resistance of Metal Matrix Composite Coatings - Effect of Microstructure

Metal matrix composite (MMC) and nanocomposite coatings are being proposed as alternatives to their monolithic counterparts. In this paper, we present the results of our tests on the corrosion response of Ni-P MMC coatings with micro-crystalline and nano-crystalline diamond as the dispersed phase.

Product Number: 51317--9806-SG
ISBN: 9806 2017 CP
Author: Othon Monteiro
Publication Date: 2017
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Metal matrix composite (MMC) and nanocomposite coatings are being proposed as alternatives to their monolithic counterparts to improve protection against wear in chemically-aggressive environments. Corrosion resistance of MMC coatings is strongly dependent on its microstructure which is affected by the physical and chemical nature of the dispersed particles as well as the particle concentration. In this paper we will present the results of our tests on the corrosion response of Ni-P MMC coatings with micro-crystalline and nano-crystalline diamond as the dispersed phase. Potentiodynamic and electrochemical impedance spectroscopy tests were performed to compare the corrosion of Ni-P composites and nanocomposites and the results are analyzed in terms of their microstructure. The corrosion potential is primarily determined by the P content and the heat treatment carried out after deposition and seems to be relatively independent of the particle content. In low-P coatings the presence of micron-size particles has no significant impact on Ecorr and icorr . Heat treatment increases Ecorr and decreases icorr. Similar trends are observed in the high-P coatings. EIS results suggest self-healing behavior with some microstructures.

Key words: Electroless Ni-P, nanocomposites, diamond

Metal matrix composite (MMC) and nanocomposite coatings are being proposed as alternatives to their monolithic counterparts to improve protection against wear in chemically-aggressive environments. Corrosion resistance of MMC coatings is strongly dependent on its microstructure which is affected by the physical and chemical nature of the dispersed particles as well as the particle concentration. In this paper we will present the results of our tests on the corrosion response of Ni-P MMC coatings with micro-crystalline and nano-crystalline diamond as the dispersed phase. Potentiodynamic and electrochemical impedance spectroscopy tests were performed to compare the corrosion of Ni-P composites and nanocomposites and the results are analyzed in terms of their microstructure. The corrosion potential is primarily determined by the P content and the heat treatment carried out after deposition and seems to be relatively independent of the particle content. In low-P coatings the presence of micron-size particles has no significant impact on Ecorr and icorr . Heat treatment increases Ecorr and decreases icorr. Similar trends are observed in the high-P coatings. EIS results suggest self-healing behavior with some microstructures.

Key words: Electroless Ni-P, nanocomposites, diamond

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