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Ni-W-B and Ni-W-B-Nanodiamond Metal Matrix Nanocomposite Protective Coatings

Picture for Ni-W-B and Ni-W-B-Nanodiamond Metal Matrix Nanocomposite Protective Coatings
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Hardness and corrosion resistance of electroplated nanocomposite coatings are reported here in light of process parameters such as current density, boron addition and diamond nanoparticles. A boron source that enables greater incorporation of B in the coating was used.

Product Number: 51317--9149-SG
ISBN: 9149 2017 CP
Author: Sankaran Murugesan
Publication Date: 2017
Industry: Coatings and Linings
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$20.00

Protective coatings in the oil and gas industry perform an important role in the reduction of maintenance and repair costs for equipment and tools. Though hard chrome plating protective coatings seem to be a viable solution the related environmental drawback of Chromium (Cr) (VI) ions in the water supply leads the industry to find alternative solutions. Based on research Nickel (Ni) and Ni-based alloy systems are being recognized as substitutes for this application with no environmental impacts. The addition of Tungsten (W) to Ni has shown better mechanical and corrosion properties while the addition of Boron (B) to these systems increases the hardness. However the addition of B to Ni coatings usually results in diminishing corrosion resistance. In this paper we introduce electroplating of Ni-W-B and Ni-W-B-nanodiamond metal matrix nanocomposite coatings and present detailed characterization of their corrosion response. Parameters influencing the microstructure and overall properties of these coatings include current density type and concentration of B-precursor in the bath and the addition of diamond nanoparticles. The impacts of these parameters on hardness and corrosion resistance were assessed. The synergistic effect of W B and nanodiamond towards mechanical and corrosion resistance properties will be discussed.

Key words: Protective coatings, Ni-W alloy, Ni-W-B alloy, Nanodiamond, Nanocomposite

 

Protective coatings in the oil and gas industry perform an important role in the reduction of maintenance and repair costs for equipment and tools. Though hard chrome plating protective coatings seem to be a viable solution the related environmental drawback of Chromium (Cr) (VI) ions in the water supply leads the industry to find alternative solutions. Based on research Nickel (Ni) and Ni-based alloy systems are being recognized as substitutes for this application with no environmental impacts. The addition of Tungsten (W) to Ni has shown better mechanical and corrosion properties while the addition of Boron (B) to these systems increases the hardness. However the addition of B to Ni coatings usually results in diminishing corrosion resistance. In this paper we introduce electroplating of Ni-W-B and Ni-W-B-nanodiamond metal matrix nanocomposite coatings and present detailed characterization of their corrosion response. Parameters influencing the microstructure and overall properties of these coatings include current density type and concentration of B-precursor in the bath and the addition of diamond nanoparticles. The impacts of these parameters on hardness and corrosion resistance were assessed. The synergistic effect of W B and nanodiamond towards mechanical and corrosion resistance properties will be discussed.

Key words: Protective coatings, Ni-W alloy, Ni-W-B alloy, Nanodiamond, Nanocomposite

 

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