Anticorrosive performance of organic coatings on steel surfaces exposed to deionized water

Abstract

Four different organic systems, containing either vinyl acetate resins or epoxy resins were applied on steel pretreated specimens exposed to deionized and deaerated water taken from the installations of the Public Greek Electricity Company. Electrochemical Impedance Spectroscopy, potentiodynamic polarization measurements, dielectric measurements and visual observations after salt spray test were performed for monitoring the changes of the organic systems characteristics at predetermined exposure time in the deionized – deaerated water. All four coating systems found providing protection on steel surfaces. The classification of their performance depends mainly on the composition of the primer, as well as, on the intrinsic characteristics of the other layers. Thus the system consisting of epoxy primer with zinc dust, epoxy high build layer and a two component epoxy paint with iron oxide is the one exhibiting the highest protection efficiency.

Anticorrosion performance of epoxy coatings on steel surface exposed to deionised water

“…20 ppb), Cl 2 ( , 100 ppb), O 2 (10-20 ppb) and conductivity (0.4 mS/cm). The characteristics of the deionised water after treatment with hydrazine were: O 2 (, 5 ppb) and pH (9.0-9.2) (Kouloumbi and Moundoulas, 2002).…”

“…Potentiodynamic polarisation measurements, consisting of anodic and cathodic potentiodynamic scans, were carried out using an arrangement (Kouloumbi and Moundoulas, 2002) in which the working electrode was the coated test panel, the reference electrode was a saturated calomel electrode (SCE) and the auxiliary electrode was a high-density graphite rod.…”

“…Potentiodynamic polarisation measurements, EIS and dielectric measurements (capacitance C and loss factor D), as well as visual observations after salt spray test were carried out. The results obtained in this study are compared with those of a previous work (Kouloumbi and Moundoulas, 2002) that examined the protection efficiency of four different organic systems, in an effort to decide upon the combination of coating's parameters that provides the most effective anticorrosion within the relevant corrosive environments.…”

Functional Coatings and Microencapsulation: A General Perspective

“…The zinc layer on galvanized steel degrades when exposed to an adverse environment, and this protects the underneath surface. Using a similar approach, both inorganic and organic resinbased, zinc-rich coatings have been developed to protect a variety of metal substrates [19,20].…”

Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings

“…The formation of an organophilic environment between the clay layers is critical for the insertion of polymer chains amongst them and the formation of an intercalated structure, which seems to present the greater improvement of barrier properties. Amongst the various polymers for coating applications, epoxy resins lately have evoked intensive studies in the preparation of nanocomposite materials, due to their high tensile strength and modulus, good adhesive properties, good chemical and corrosion resistance, low shrinkage in cure, and excellent dimensional stability [1,8,[15][16][17][18][19].…”