Influence Of Thermal Treatment On Adsorption Ability Of Amorphous Alloys

Category: VI Ukrainian-Polish Symposium

Influence of thermal treatment on adsorption ability of amorphous Alloys

O.M. Hertsyk, M.O. Kovbuz, L.M. Bednarska

Lviv Ivan Franko National University, Lviv, Ukraine

Constructions made of amorphous metallic alloys (AMA) are used under rigid conditions. The structure and elemental composition of the surface of the alloys change partly under the influence of different external factors, namely the change of temperature. Consequently, it may cause the change of the adsorption ability of AMA. In this connection the adsorption of water, 0.5 M aqueous solution of sodium chloride and 0.2 M solution of piperidine, which is known for being an inhibitor, on the surface of previously exposed to thermal treatment doped amorphous alloys Fe-Si-B was estimated by means of different independent physical-chemical methods.

The limiting wetting angle (cos q) measurements and the calculations of the work of adhesion (Wa) showed that water, aqueous solution of sodium chloride and aqueous solution of piperidine better adsorb on the surface of AMA, which was kept at temperature 77 K during 2 hours. The solution of piperidine in sodium chloride better adsorbs on the surface, which was not exposed to thermal treatment.

Analogous results were obtained by methods of cyclic voltammetry and potentiometric study. The presence of amine in the adsorption layer restraines the process of the increasing of the oxidation number of iron for both alloys. However for the alloy, which was exposed to the thermal treatment, the value of the corrosion current is 1,5 times higher and the potential of corrosion is moved for 0,15 V to the cathodic side. It correlates with the values of cosq and Wa and indicates less adsorption of piperidine on this surface.

The results of X-ray structure analysis showed that the increase of temperature of thermal treatment till 400-600 K provokes partial crystallization of AMA, what causes irregular distribution of energy on their surface. It considerably changes the adsorption ability and catalytic characteristics of the alloys.



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