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INFLUENCE OF HEAT TREATMENT ON CORROSION RESISTANCE OF NANOCOMPOZITE NI-P-AL2O3 LAYERS

T. Radu, L. Balint, G. G. Istrate
Thursday 11 October 2018 by Libadmin2018

ABSTRACT

The research consisted in obtaining Ni-P and Ni-P-Al2O3 coatings followed by heat
treatment and characterization of heat treated and untreated layers. The layers were
deposited on the steel strip, by electroless method to certain process parameters. To
obtain the Ni-P-Al2O3 nanocomposite layers, 5 g/L Al2O3 particles of 20 nm were
introduced into the nickel bath, and it has been worked with the same parameters as to
obtain the Ni-P layer. The samples were heat treated at 300 0C, 400 0C and 5000C for
one hour in a protective atmosphere. The chemical composition of the obtained layers
was determined by energy-dispersive analysis (EDAX), and the microstructure, layer
thickness and surface appearance were analysed by scanning electron microscopy
(SEM) and optical microscopy. Corrosion behaviour of heat treated and untreated
samples was electrochemically analysed by potentiodynamic method in a 3.5 % NaCl
solution. To determine the potential and intensity of the corrosion current, the open
circuit potential and Tafel curves were plotted. It has been found by comparative
analysis how the heat treatment influences the corrosion behaviour. Corrosion
behaviour has been correlated with processes that take place at different heat treatment temperatures.

Keywords: electroless, heat treatment, microstructures, corrosion


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