Development of electroless composite coatings by using in-situ co-precipitation followed by co-deposition process

Sharma, S.B.; Agarwala, R. C.; Agarwala, Vijaya; Satyanarayana, K. G.

doi:10.1007/s11663-005-0002-7

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…The ability to co-deposit fine particulate substance(s) within an electroless metal deposit has led to a new generation of composite coatings [15][16][17][18][19][20]. EL dispersion alloy coating uses the conventional EL reduction reaction processes with a suspension of particles to produce deposits that modifies microstructure and thus changing the surface finish of the coating.…”

Section: Methodsmentioning

confidence: 99%

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Studies on Electroless Coatings

Agarwala

2005

DDF

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Since the introduction of Electroless (EL) coating in 1946 by Brenner and Riddle, the process has been the subject of steady growth. It is one of the most elegant methods available for the production of protective coatings on surface. The technique involves the autocatalytic reduction, at the substrate/solution interface, of cations released from suitable chemical reducing agents with in the EL bath. EL coating technique is simple one, as can be manifested just by controlling pH and temperature of the coating bath. Such coatings are reported to provide excellent physical and mechanical properties. The nickel, silver and copper based alloy and composite EL coatings are being studied at Indian Institute of Technology Roorkee since 1985 and this paper deals with the gist of the same. The structural behavior of Ni-P coatings for different phosphorus contents has been extensively studied. Transmission electron microscopy (TEM) and magnetic movement studies have been used as tools for structural and kinetic studies, respectively. Submicron size coating islands and their transformations have been deduced. The metallography studies using hot stage within TEM to follow the phase transformations occurring at various temperatures have been studied for Ni-B, EL coatings. As a forward step towards composite coatings, Ni-P-C, Ni-P-Al2O3, Ni-P-ZrO2 etc. have been developed by co-deposition techniques. Ag-graphite composite coatings produced by EL technique exhibits ~5 times higher wear resistance and ~ 2 times better corrosion resistance apart from being a good electrical conductor. The tribological behavior of EL Ni-P-X and Ni-P coatings on steel and aluminium substrates in different conditions i.e., as-coated, heat treated at various temperatures at different extents of time with different normal loads, have been studied in terms of dry sliding friction and wear against counter face of case hardened steel. In Ni-P-X nanocoatings (X= ZrO2-Al2O3-Al3Zr), X has been produced in-situ and are composed of nano-sized particles. Such coating could be produced uniformly on carbon fibre of 7µ diameter. Ni-P and Cu are also coated successfully on graphite/ oxide powders of ~ 120µ sizes. Micro-thickness coatings are paving ways to nanocoatings. These are the coatings in which either the thickness of the coating is in nano level or the second phase, that dispersed in the coating matrix is of nano-size. Ni-P-Ferrite nano coatings with thickness less than ~0.1mm thick, is found to exhibit about 20db of absorption of microwave in the rage of 12-18 GHz which can be exploited for radar applications. Here the nano-sized ferrite particles are co-deposited along with the Ni-P EL coatings.

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Section: Methodsmentioning

confidence: 99%

“…Diffusion in Materials -DIMAT2004 composite coating by in-situ co-precipitation of Al 2 O 3 and ZrO 2 followed by their co-deposition along with Al 3 Zr on commercial aluminium by EL technique [16][17][18][19][20]. Here too the globular nuclei seem to grow on the substrate with lateral growth.…”

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confidence: 99%

Studies on Electroless Coatings

Agarwala

2005

DDF

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“…However, the Ni-P globule size is getting reduced due to the precipitation of in-situ co-precipitation of Al Also, the crystalline nature is less prominent in Ni-P-X satisfies the result of SEM analysis and the grain size reduction by the presence of broaden peak. The optimal bath composition was obtained for the composite coating such that it resulted in uniform and well adherent coating on the catalytic surface [23,25]. When the same coating was applied on the carbon fabric (fibres of 7µ diameter), a uniform coating as shown in Fig.…”

Section: Characterisation Studies For El Alloy Coatingsmentioning

confidence: 99%

Studies on Electroless Coatings at IIT Roorkee - A Brief Review

Makkar

Agarwala

2012

MSF

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Since the introduction of Electroless (EL) coating in 1946 by Brenner and Riddle, the process has been the subject of steady growth. It is one of the most elegant methods available for the production of alloy coatings on surface. The technique involves the autocatalytic reduction, at the substrate/solution interface, of cations by EL bath released from suitable chemical reducing agents. EL coating technique is simple one, as can be manifested just by controlling pH and temperature of the coating bath. Such coatings are reported to provide excellent physical and mechanical properties. The electroless coatings are being studied at Indian Institute of Technology Roorkee since 1985. The structural and morphological behavior of Ni-P coatings for different phosphorous contents has been extensively studied. Sub-micron size coating islands and their transformations have been deduced. The metallography studies using hot stage within TEM to follow the phase transformations occurring at various temperatures have been studied for Ni-B EL coatings. The realization of mechanical bonding along with chemical bonding between EL coating and the substrate has been explained by coated copper on ceramic powder. As a forward step towards composite coatings, Ni-P-C, Ni-P-Al2O3, Ni-P-ZrO2 has been developed by EL co-deposition technique. Ag-graphite coatings produced by EL technique exhibits nearly five times higher wear resistance and nearly two times better corrosion resistance apart from a good electrical conductor. The tribological behavior of electroless Ni-P-X and Ni-P coatings on steel and aluminium substrates in different conditions i.e., as coated, heat treated at various temperatures at different extents of time with different normal loads, have been studied in terms of dry sliding friction and wear against counter face of case hardened steel. In Ni-P-X nanocoating (X= ZrO2-Al2O3-Al3Zr), X has been produced in-situ and are of nanosize particles. Such coating could be done on carbon fibre of 7µ diameter uniformly. Ni-P-ferrite nanocoatings with thickness less than nearly 1mm thick, is exhibiting good absorption of microwave in the range of 12-18 GHz which can be exploited for radar applications. Micro-thickness coatings are paying ways to nanocoatings. Nanocoatings are the coatings in which either the thickness of the coating is in nanolevel or second phase that dispersed in the coat matrix is of nanosize. To further explore the field of EL nanocomposite coatings, now days, a work on EL Ni-P-ZnO, TiO2, Al2O3, ZrO2 and Ni-B-ZrO2 for its mechanical properties has been carried out.

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Development of nano IrO2 composite-reinforced nickel–phosphorous electrodes for hydrogen evolution reaction

Shibli

Dilimon

2007

J Solid State Electrochem

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Development of electroless composite coatings by using in-situ co-precipitation followed by co-deposition process

Cited by 11 publications

References 16 publications

Studies on Electroless Coatings

Studies on Electroless Coatings

Studies on Electroless Coatings at IIT Roorkee - A Brief Review

Development of nano IrO2 composite-reinforced nickel–phosphorous electrodes for hydrogen evolution reaction

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