Journal of

Corrosion and Anticorrosion Protection

Volume I, Issue 1, 2006

Content

THE ACTUAL STAGE OF THE THERMAL ZINC PLATING TECHNOLOGIES

Caius BULEA , Horaţiu VERMESAN, E. GRUNWALD, George VERMESAN
¹ S.C. BETAK S.A. Bistrița
² Technical University of Cluj-Napoca, Romania

Abstract: The knowledge and modernisation of the galvanisation technologies, along with the cost reduction and the improvement of the galvanised products quality is an important factor, which can influence the activities in a galvanising workshop. Starting from these observations, in this work, a study of the main thermic galvanisation technologies is made, as result from the scientific literature and from the authors' practice and experience. Among the studied thermic galvanisation technologies, we mention the following: the TECHNIGALVA procedure, the continuous galvanisation, the zinc deposit through spraying, the thermic galvanisation + the phosphating; the thermic galvanisation followed by painting (the DUPLEX procedure), the thermic galvanisation + the difusion annealing, the wet and dry galvanising procedures; the SENDZMIR procedure (clean technology). In the last part of the work, the main conclusions are presented.

THE STRUCTURE AND THE PROPERTIES OF THE COATINGS OBTAINED THROUGH THERMAL ZINC PLATING

Ernest GRUNWALD¹, Horațiu VERMESAN² , Caius BULEA¹, George VERMESAN^2
1 S.C. BETAK S.A. Bistrița
² Technical University of Cluj-Napoca, Romania

Abstract: After a short introduction, in which the importance of hot dip coatings deposit is shown, as well as the enumeration of these coatings with a short characterisation, the paper presents the thermal galvanisation, insisting on its main advantages. Then, it analyses the structure of the galvanised coating, starting from Fe-Zn system, the mechanism and the kinetics of the coating formation, as well as the analysis of the main influent factors. In the last part of the paper, the main properties of the galvanised coating are presented.

THE CORROSION BEHAVIOR OF THE THERMALLY GALVANIZED COATINGS

Horațiu VERMESAN , Elena VERMESAN, Caius BULEA, Ernest GRUNWALD
¹ Technical University of Cluj-Napoca, Romania
² S.C. BETAK S.A. Bistrița, Romania

Abstract: The work presents an analytical study regarding the corrosion behaviour of the thermally deposited coatings, also noticing the mechanisms through which each constitutive phase (eta, zeta, delta, gamma. alfa) of the zinc coating, according to its position in the layer and its electrochemical potential, behaves in different corrosive environments. It is also analysed the influence of the technological galvanisation parameters of the bath composition, of the atmosphere types, as well as the influence of the sulphur dioxide upon the corrosion resistance of the zinc thermic deposits.

THE IMPACT OF THE GALVANIZATION PROCEDURE ON THE ENVIRONMENT AND ON HUMAN HEALTH

Elena VERMESAN¹, Caius BULEA² , Horatiu VERMESAN^1
1 Technical University of Cluj-Napoca, Romania
² S.C. BETAK S.A. Bistrița, Romania

Abstract: The work presents a detailed study regarding the nature of the pollution substances, present in all the stages of the galvanisation process: degreasing, pickling, fluxing, the galvanisation itself in zinc hot dip, residuum and zinc ash formation. Their individual and global impact on the environment and on human health is analysed. Also, some solutions for the diminishing of their negative effects are presented, as well as legislative settlements regarding this aspect.

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