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