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„Ochrona przed Korozją” (Corrosion Protection) No. 09/2014

 


 View cover and table of contents (in Polish and English) (pdf)


Environmentally friendly sol-gel coatings for aluminium alloys

PAUSSA L.

ANDREATTA F.

FEDRIZZI L.

University of Udine, Department of Chemistry, Physics and Environment,Udine, Italy

 

Development of Cr-free coatings is an important issue for replacement of chromate conversion coatings in aerospace and automotive industry. Our research approach considered the development of thin ZrO2 coatings (100–200 nm) by means of sol-gel technology for different aluminium alloys (AA2024, AA6060 and AA3105). ZrO2 films were deposited employing solutions of Zr precursors. Two preparation routes were followed: the first employed a metal-organic precursor in an alcoholic solution; the second one used a water-based solution of a Zr salt. Coating application was carried out by dipping and spraying technology at a laboratory scale. Morphology of ZrO2 pre-treatments was investigated by means of SEM-EDXS. Film thickness and composition were studied by means of glow discharge optical emission spectroscopy (GDOES). Substrates pre-treated with ZrO2 films

were painted with an organic primer and top coat in order to evaluate paint adhesion and electrochemical behaviour of painted systems. In addition, coating deposition was successively carried out with a robot-controlled air pressure gun in spraying cabins in order to evaluate industrial production of the ZrO2 films.

Keywords: Cr-free coatings, sol-gel, aluminium, adhesion

 

2014

Vol. 57, nr 9

p. 338-343

Ref. 12

 


 

The effect of isobutyltriethoxysilane concentration on the protective properties of aged silane films on stainless steel

OWCZAREK E.

Technical University of Czestochowa, Department of Chemistry/

Politechnika Częstochowska, Katedra Chemii

 

Protective properties of air aged films obtained from solutions of different concentration of isobutyltriethoxysilane (IBTES) prepared on X20Cr13 stainless steel substrate were evaluated. The corrosion resistance of obtained films in weak alkaline (pH = 9) solutions containing anions: HCO3-, CO32-, SO42- or alternative Cl- were examined. It was found that IBTES films inhibit the corrosion of steel substrate and their protective properties improve with the concentration of silane solution.

Keywords: organofunction silane, aged films, corrosion resistance, stainless steel

2014

Vol. 57, nr 9

p. 344-346

Ref. 27

 


 

Corrosion protection in practice

 

Trends and expectation of industry concerning anticorrosive paints

ZUBIELEWICZ M.

Instytut Inżynierii Materiałów Polimerowych i Barwników, Oddział Farb i Tworzyw, Gliwice

The advancements in paint technology must meet not only quality requirements but also aspects concerning health and environment protection. The principal objective of environmental protection regulations is the limitation of VOC (volatile organic compounds) emission and the elimination of toxic anticorrosive pigments. To comply with these requirements, new generation of binders with improved barrier properties, which simultaneously enable formulation of paints with lower organic solvents content is developed. Hybrid binders or nanotechnologies allow for creation of coatings without anticorrosive pigments, which control corrosion by preventing corrosive media from accessing the metal substrate. Coatings that meet requirements both in terms of properties, as well as health and environmental protection, including smart coatings based on nanomaterials, are discussed.

Keywords: anticorrosive paints, nanotechnology, smart coatings

 

2014

Vol. 57, nr 9

p. 347-352

Ref. 65

 


 

Corrosion protection in practice

 

Evaluation of protective properties of Breston CV350HT coating system for anticorrosion protection of Flue Gas Desulphurisation installations

BORDZIŁOWSKI J.

CES, Gdańsk

The results of impedance (EIS) evaluation of vinyl ester coating system Breston CV350HT used for anticorrosive protection in heavy corrosion environments, for instance in FGD installation, were presented. Experiments were carried out in 3% NaCl aqueous solution at open circuit potential in function of 24–1440 hours immersion time. The EIS results were analyzed using the model represented by the selected electrical equivalent circuit. The application of EIS enabled the determination of protective mechanism parameters of the coating system. The adhesion evaluation connected with the EIS investigation allows putting forward a proposal of anticorrosive properties of the investigated coating system.

Keywords. AC impedance, vinyl ester coating system , FGD, anticorrosion protection

 

2014

Vol. 57, nr 9

p. 354-358

Ref. 33