Journal of

Corrosion and Anticorrosion Protection

Volume IV, Issue 3, 2009

Content

Horaţiu VERMESAN , Ernest GRÜNWALD , Elena VERMESAN, Caius BULEA , Vasile RUS .
Chronopotentiometric studies of the benzylideneacetone as brightener for zinc electrodeposition from weak-acid electrolytes

Abstract: This study focuses on benzylideneacetone surfactant C₁₀H₁₀O (B.AC) as brightener for zinc electrodeposition from weak-acid baths with various Zn²⁺ ions concentrations and various brightener amounts added.
Benzylideneacetone is a very effective brightener to form a fine, compact and bright zinc layer.
An original chronopotentiometric study and data processing system was used in this study.
This work shows the results of a chronopotentiometric study with highlights on some aspects regarding the benzylideneacetone influence on electrodeposited zinc layers from diluted weak-acid zinc electrolytes.

Andreea HEGYI , George VERMESAN , Horaţiu VERMESAN .
Applications of hot-dipped zinc (galvanized) coatings for reinforced concrete structures

Abstract: The durability of civil, industrial and military constructions affects state environmental and can have economical and social consequences.
One of the directions of research in the field of construction is to enlarge the sustainability and reduce environmental impact. The corrosion of reinforced concrete structures is a domain that is studied for a long time with real but unconvincing results because of the complexity of the phenomenology caused by the interaction between the concrete, the reinforcement and the environment. The hot-deep galvanization method of steel used for reinforcing concrete assure a good protection against corrosion and extends the lifetime of structures. Galvanizing of the component elements of the buildings is a good solution for this purpose. The article presents the effects of galvanization, especially in reinforced concrete and steel structures.

D. González MARTIN, V. LUCERO, J.C. Mirza ROSCA
Passivation study of Ti-5Al-4V in artificial saliva

Abstract: The surface films formed on titanium alloy Ti-5Al-4V are investigated in different experimental conditions. One of these conditions is a heat treatment: 24 hours in oven at 500°C, then cooled in water. Another condition is a H₂SO₄ treatment: the samples are immersed in H₂SO₄ 3M, for 1 minute at 60 volts. The last condition is a NaOH treatment: the samples are immersed in NaOH 10M at 60°C for 24 hours. In order to characterise the surface film formed in each case in artificial saliva, different techniques were applied: optical metallography, ESEM and EDAX, Vickers microhardness, Open circuit potential and Electrochemical Impedance Spectroscopy. The results were correlated and the nature and the structure of the surface film in every experimental condition was analysed..

Adriana VLASA, Simona VARVARA, Liana Maria MURESAN
Corrosion investigation of Zn-TiO₂ composite coatings by using electrochemical impedance spectroscopy

Abstract: The corrosion resistance of composite coatings obtained by electrolytic co-deposition of Zn with two types of TiO₂ nanoparticles was investigated by using electrochemical impedance spectroscopy (SIE).
The electrodeposition of the Zn-TiO₂ nanocomposite films was carried out in an aqueous electrolyte containing 75 g/l ZnCl₂, 230 g/l KCl, 20 g/l H₃BO₃, brightening agents and suspended TiO₂ nanoparticles (Alfa Aesar (AA) 99.9%, 32 nm) or Degussa (D) 99.5%, 21 nm) in a concentration of 5 g/l. For corrosion studies, a solution of 0.2 g/l (NH₄)₂SO₄ (pH 3) was used.
It was found that, in the same experimental conditions, TiO₂ Degussa confers to the zinc coatings in which is incorporated better corrosion resistance than TiO₂ Alfa Aesar. Both composite Zn-TiO₂ deposits are more corrosion resistant than pure Zn coatings.

Eva TRIMBITASU, Octav PANTEA, Stelian NEAGOE, Andreea BONDAREV, Sonia MIHAI
Aspects regarding metals corrosion in different electrolites solutions

Abstract: In this paper it is presented a study regarding the variation of the corrosion rate of some metallic materials immersed in electrolyte solutions. It was used the method of losing weight of the metallic samples and after the specimens exposure in corrosive media, these were observed at electronic microscope. The experimental results are presented as tables and graphs.

Eva TRIMBITASU , Octav PANTEA, Andreea BONDAREV, Sonia MIHAI, Stelian NEAGOE
The urban traffic, a pollution reason in Ploiesti city

Abstract: Soils pollution with heavy metals is mainly influenced by the road traffic intensity. In this paper it was presented a study regarding the soils heavy metals content from intense circulated areas from Ploiesti City. There were drawn soils samples from five places where the traffic is intensely and it was supervised the heavy metals content for five weeks. The determination of heavy metals content was made by the spectrophotometric method after the mineralization of soil samples. The obtained experimental data are presented and graphically correlated.

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