corrosion

Corrosion is the deterioration of a substance (usually a metal) or its properties because of the reaction with its environment. There are many forms of corrosion, some of which are encountered in everyday life. Direct losses due to corrosion are more than $276 billion dollars annually = 3.1% of Gross Domestic Product only in the United States. If we consider the rest of the world this figure would be many times higher. However, corrosion and its control besides of its importance, is often a neglected element in the practice of engineering.

The protective properties of six corrosion inhibitors based on imidazolines, amides, amines and esters have been determined using gravimetric and potentiometric methods. The effect of inhibitor solvent on the protective properties has been examined. The dependence of inhibitor protective effect upon the content of nitrogen and functional groups has been determined. The most effective inhibitors have been chosen and their IR-spectra have been shown.

Comparative assessment of corrosion stability of mild steels 3, 20 and 08KP in tap water was conducted. Similar corrosion behavior of these steels was shown by weight loss, linear polarization resistance and polarization curves techniques both for pretreated and corroded surfaces. The discrepancy of the results obtained with the LPR and weight loss techniques was found out and its possible reasons were discussed.

Scanning electron microscopy was used to study the reactivity of iron-gall inks with varying iron concentrations. Vegetable extracts with hydrolysable tannins produced stable ink, while the presence of crystal aggregates explained the low reactivity of condensed tannins. This novel archaeometric approach has proved useful in chemical corrosion studies of ancient documents.

The degree of the baddeleyite-corundum refractories erosion depending on the areas of their location in the glass-making furnace in the float glass production was established. With the use of petrographic analysis the influence of chemical and mineral composition and also temperature and gas environment on corrosion of bacor linings was studied. Due to obtained results the recommendations in relation to the increase of glass-attack resistance of the furnace and its service life length were formulated.