Electrodeposition of Ni-La2O3 composite on AA6061 alloy and its enhanced hardness, corrosion resistance and thermal stability

In this work, the microstructure, microhardness, corrosion behavior and thermal stability of Ni-La2O3 composite on AA6061 aluminum alloy were studied. Corrosion behavior was studied with 3.5wt% NaCl solution at room temperature in a static electrolyte condition. Ni-La2O3 showed nobler corrosion pote...

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Bibliographic Details
Published in:Surface & coatings technology 2017-09, Vol.324, p.471-477
Main Authors: Rangasamy Krishnan, V.P., Subramanian, M.
Format: Article
Language:English
Subjects:
AA6061 alloy
Aluminum base alloys
Corrosion potential
Corrosion resistance
Corrosion resistant alloys
Differential scanning calorimetry
Electrodeposition
Hardness
Heat measurement
Lanthanum oxides
Microhardness
Microstructure
Ni-La2O3 composite
Nickel
Thermal resistance
Thermal stability
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Summary:In this work, the microstructure, microhardness, corrosion behavior and thermal stability of Ni-La2O3 composite on AA6061 aluminum alloy were studied. Corrosion behavior was studied with 3.5wt% NaCl solution at room temperature in a static electrolyte condition. Ni-La2O3 showed nobler corrosion potential than the pure nickel and aluminum alloy and a maximum microhardness of 750HV (Vicker's hardness) was observed at optimized conditions. It is evident that the incorporation of La2O3 in the Ni metal matrix leads to the corrosion resistance and the hardness improvement. Thermal stability was studied by using differential scanning calorimetry (DSC) as well as annealing at constant temperature of 500°C for 5h in a furnace and it shows better thermal stability of the composite. Electrodeposited Ni-La2O3 composites were characterized by SEM/FESEM, EDS, XRD and electrochemical techniques. •Electrolyte composition and plating parameters were studied for lanthanum oxide reinforced nickel metal matrix composite on AA6061 alloy.•The agitation speed and oxide particle content in the bath are the main parameters in the composite plating.•Rare earth oxide reinforced composites not only improves the corrosion resistance but also the hardness and thermal stability.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2017.06.011