Journal of

Corrosion and Anticorrosion Protection

Volume V, Issue 3, 2010

Content

Gabriela Elena BADEA^a , Teodora BADEA^b
a Department of Energy Engineering and Management, University of Oradea, Romania
^b Department of Applied Physical Chemistry and Electrochemistry, Polytechnic University of Bucharest, Romania

CONCERNING TO THE POLARISATION MEASUREMENTS FOR DETERMINATION OF INSTANTANEOUS CORROSION RATES

Abstract: Based on the literature data, in this paper are described the electrochemical theoretical concepts for the two methods used for determination of instantaneous corrosion rates from polarization measurements: extrapolation of the Tafel slopes with corrosion potential - Stern method and polarization resistance - Stern-Geary method. The error-producing factors are show also.

Alina - Crina CIUBOTARIU^a , Lidia BENEA^a, Wolfgang SAND^b
a Dunarea de Jos, University of Galati, Metallurgy and Materials Science Faculty, Competences Center Interfaces-Tribocorrosion - Electrochemical Systems - CC-ITES, 111 Domneasca Street, 800201, GALATI, Romania
^b University of Duisburg Essen, Biofilm Centre, Aquatic Biotechnology, Geibelstraße 41, 47057, Duisburg, Germany

ATOMIC FORCE MICROSCOPY METHOD FOR INVESTIGATE THE STRUCTURAL ASPECTS OF THERMOSETTING POLYMERS/Zn COMPOSITE LAYERS

Abstract: The present work has the purpose of studying structural aspects of composite layers having zinc matrix and thermosetting polymers (PF resin type NOVOLAC - RESITAL 6358/1 and epoxy resin type DINOX 110L) as dispersed phase obtained during electrodeposition process of zinc. The composite layers were electrodeposited from a suspension of resin particles in aqueous zinc sulphate electrolyte by adding 10g/L resin particles with size 6 - 10µm into electrolyte solution. The structure of the composite layers was investigated by atomic force microscopy (AFM) method. The surface morphology of thermosetting polymers/Zn composite layers is different compared with pure zinc layers: the regular crystal structure characteristic of electroplated zinc layers was disturbed. The decreases of the roughness of composite layers comparing with roughness of pure zinc layers can be determinate by the fine structure of the composite layers.

Mircea D. RATIU^a, Horatiu VERMESAN^b, Vasile RUS^b
a advisor Power Plants Fitness for Service Validation
^b Tehnical University of Cluj-Napoca

CORROSION AWARENESS MAINTENANCE PROGRAM FOR POWER PIPING LINES

Abstract: The unavoidable corrosion damage increases substantially the operating cost in power plants -nuclear and fossil- through the scheduled and especially the unscheduled shutdowns for repair. Therefore, a proactive-prospective awareness program would be beneficial to keep the plant in safe operation for as long as practical. The CALCET proposed Corrosion Awareness Maintenance (CAM) Program provides maintenance actions to monitor the operation induced wall thinning and the pertinent evaluation of prospective remaining safe life. The program includes: (a) preventive retrofit maintenance of critical parts; (b) proactive control by component periodical inspection; (c) on-line specimen monitoring: and (d) prospective damage increase defining the remaining safe fitness for service. The program presents the specific requirements for the general corrosion on stagnant fluids (tanks, vessels, reservoirs) and erosioncorrosion on streaming fluids (high pressure pipe lines), considering also the difference in operating temperature: moderate (less or equal to 260°C), or high (greater than 260°C).

S. SZABÓ and I. BAKOS^a
a Institute of Materials and Environmental Chemistry, Chemical Research Center, Hungarian Academy of Sciences H-1525 Budapest, P.O.Box. 17. Hungary

CORROSION EFFECTS OF METAL CATALYSTS

Abstract: A short summarization of possible corrosion effects of metal catalysts on their environs has been made in order to draw attention to the importance of this entirely ignored field of metal corrosion.

Ernest GRUNWALD^a, Caius BULEA^a, Horatiu VERMESAN^b, Vasile RUS^a
a SC BETAK SA Bistrita ^b Tehnical University of Cluj-Napoca

PROPERTIES COMPARISON BETWEEN DIFFERENT ZINC PLATING ELECTROLYTE TYPES

Abstract: The paper presents a comparison between the properties of different types of electrolytes used in zinc electroplating industry. The alkaline electrolytes with or without cyanide content, weak acid and acid electrolytes are analyzed. The advantages and disadvantages of each type of electrolyte are systematically presented in tables, together with some technological specifications. The paper is a synthesis of practical knowledge applicable in industry, acquired over 50 years of experience, being useful to those working in the field of zinc electroplating.

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