SVIBOR - Project code: 2-15-122

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
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Project code: 2-15-122


ELECTROCHEMICAL PROCESSES ON THE PHASE BOUNDARY AND SURFACE PHYSICAL CHARACTERISTICS


Main researcher: RADOŠEVIĆ, JAGODA (39742)


Assistants
Type of research: applied
Duration from: 01/01/91. to 12/30/95.
Papers on project (total): 43
Papers on project quoted in Current Contents: 3
Institution name: Tehnološki fakultet, Split (11)
Department/Institute: DEPARTMENT OF CHEMICAL ENGINEERING AND TECHNOLOGY LABORATORY OF ELECTROCHEMISTRY AND CORROSION
Address: TESLINA 10/V
City: 21000 - Split, Croatia
Communication
Phone: 385 021 341 633
Fax: 385 021 341 624
E-mail: rjagoda@mateh.tehst.hr
Summary: The behaviour of super pure aluminium and Al-alloys will be examined in electrolyte solutions at potentials more negative than that of an open circuit. The effect of organic inhibitors on corrosion of aluminium in that potential range will be explored and possible mechanisms suggested. Determination of corrosion processes kinetics will contribute to finding out the optimum alloy for electrochemical current sources. Physical properties, conductivity mechanisms, dielectric constants, and surface structure and chemical composition will be examined. Electrochemical and photoelectrochemical processes will be studied at the phase boundary solid (metal, metal alloy, metal oxide) - electrolyte (aqueous, waterless with or without inhibitors added) by means of methods of high discrimination characteristics and by impedance measurements. A combination of SEM, XPS and AES methods with analytical examination of the solution system by mass atomic spectrometry will add to our understanding of these processes, possible stable reactions and products of materials examined.

Keywords: high pure aluminium, Al-alloys, aluminium oxide, cathodic polarization, copper, Cu-alloys, cuprous oxide, cadmium sulphide, tin, phase transition, nucleation, strain energy, interfacial energy, photoelectrochemical cells, organic inhibitors, semiconducting film, conversion efficiency.

Research goals: Priority research with long-term objectives at home and abroad encompasses the fundamental issues concerning physical and chemical properties of materials used in industry and energy technologies. Based on the experimental research, a study of literature data, and definition of theoretical hypotheses by the project proposer, an analysis of the process mechanism in super-pure aluminium was carried out and reported on in international journals. However, the literature contains little or almost no information on cathodic behaviour of aluminium alloys, inert or active. Properties of many electrochemical solar conversion systems are well known, but all recent studies have dealt with problems of stabilization of photoelectrode operation. This point to a need for a more intensive examination of composition and structure, physical and chemical properties of the surface, the relation between surface and volume properties, corrosion processes and the effect of organic inhibitors on preventing degradation processes. The aim of the project proposed is to make up for the lack knowledge about how the properties of the oxide film on Al-alloys are affected by previous cathodic polarization. Also, it has been planned to determine the physical parameters characteristic for surfaces of Cu and Cu-alloys and other metals and oxide films relative to their volume properties. Examination of the processes at the phase boundaries is to determine effectiveness of conversion and inhibition and explain the mechanisms of (photo) corrosion processes and their inhibition by inhibitors. That would provide for longer durability of materials in solutions. Examinations will contribute to an increase in scientific competence in order to provide for more successful transfer of knowledge throughout the world.
Other information about the project.
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Last update: 10/09/95
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