Journal of

Corrosion and Anticorrosion Protection

Volume V, Issue 2, 2010

Content

Stefan DRAGOMIR^a
a Nuclear Research Dept. Pitesti S.A. - Prototipuri, Mioveni

EXPERIMENTS CONCERNING THE BEHAVIOUR TO CORROSION OF THE WELDED JOINTS MADE FROM 6061-T6 ALUMINUM ALLOYS

Abstract: Aluminum alloys of the 6000 series are heat treated alloys, and have an average mechanical strength and a high corrosion resistance, given by the occurrence of a transparent oxide layer, with a good adherence. The destruction of the protective oxide layer is determined, first of all, by external factors, such as: temperature, environment pH and composition, flow rate of the contrast solution, thermomechanical treatments applicable to alloys, etc. The utilization of the electrochemical methods for detection and measuring the corrosion effects leads to the shortening of the experiment duration and to the increasing of the results accuracy. Aluminum alloys 6061 - T6, welded with different filler materials, heat treated alloys or not, have been investigated by the electrochemical methods, such as potentio-dynamic method and cyclic polarization method.

Viorica MUSAT^a, Alexandru PETRICA^a, Florentina POTECASU^a
a "Dunarea de Jos" University of Galati, Faculty of Metallurgy and Materials Science

SILCA-BASED PROTECTIVE COATING OBTAINED BY SOL-GEL METHOD FOR METALLIC BELTS

Abstract: The sol-gel method represents a promising approach to the development of corrosive protected surfaces. This paper presents the microstructure, the microhardness and the corrosion behaviour of silicabased coatings obtained by sol-gel dip-coating method on metallic (Al, Cu and steel) substrates.

Ioan PEPENAR^a
a ICECON-Research Centre-CERTINCON Bucharest

CONTRIBUTION TO THE STUDY OF THE CORROSION OF REINFORCED CONCRETE IN AMMONIUM NITRATE AGGRESSIVE ENVIRONMENTS

Abstract: The paper presents the results of the researches on the service behaviour of reinforced concrete constructions subjected to the action of ammonium nitrate environments and the mechanisms of the corrosion processes of concrete and steel reinforcement under the action of such specific environments. The researches were performed "in situ", on reinforced concrete constructions in aggressive environments with ammonium nitrate obtained from the technological process of chemical fertilizers, as well as in laboratory, on concrete samples, extracted from some construction elements damaged by corrosion. There were also performed researches on cement paste and concrete specimens (reinforced and prestressed concrete specimens) exposed to the action of ammonium nitrate solutions of various concentrations. The conclusions underlined the complexity of the corrosion process on reinforced concrete constructions in ammonium nitrate environments, also affecting concrete and steel reinforcement. The considerations on the mechanisms of the corrosion processes of concrete and steel reinforcement under the action of ammonium nitrate environments are also described.

Lucia STAICU^a, George VERMESAN^a, Horatiu VERMESAN^a
a Technical Universitry of Cluj-Napoca, Romania

COMPARATIVE STUDY CONCERNING THE CORROSION BEHAVIOUR OF SOME DENTAL ALLOYS BASED ON Co, Ni AND Cu

Abstract: The aim of this paper is to compare the corrosion behavior of some dental alloys based on Co, Ni and Cu so that the results of corrosion tests applied to this study, together with results of other studies, to enable dentists and patients to opt for a type of alloy in the manufacture of dental work.

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