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Pregled bibliografske jedinice broj: 211629

Spot potential profiles and pitting liability of thermally oxidised stainless steel


Esih, Ivan; Alar, Vesna; Juraga, Ivan
Spot potential profiles and pitting liability of thermally oxidised stainless steel // Corrosion and protection in high technology era
Peking, Kina, 2005. (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
Spot potential profiles and pitting liability of thermally oxidised stainless steel

Autori
Esih, Ivan ; Alar, Vesna ; Juraga, Ivan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Corrosion and protection in high technology era / - Peking, Kina, 2005

Skup
16th International corrosion congress

Mjesto i datum
Peking, Kina, 19-24.09.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Stainless steel; thermal oxidation; spot potentials; pitting

Sažetak
Effect of thermal oxidation on the behavior of stainless steel (SS) in FeCl3-solution was investigated. Rectangular sheet specimens of SS AISI 316L with observed area S=90 cm2 were immersed into the solution (a) in the initial state, (b) after heating in air isothermally at 200, 400, 600, 800 and 1000 °C respectively, or in temperature gradient between 1100 and 100 °C, and (c) after heating and subsequent removal of thermal oxides in HNO3/HF-mixture. Spot potential profiles of specimens were taken up using a device with graphite counter-electrode by measuring potential differences between specimen and graphite, Δ E. The presence of thermal oxides enhances profile non-uniformity that corresponds to increased electrochemical heterogeneity of SS surface. The removal of thermal oxides decreases profile non-uniformity, but it does not restore the initial degree of homogeneity. The prolonged exposure to FeCl3-solution provokes pitting corrosion of specimens heated isothermally at 400 °C and above it or heated in temperature gradient. On such specimens pits number, np, their depths, hp, and orifice areas, Sp, were determined. Maximum pits density, np/S, is observed after heating at 600 °C. Average pit depths, hp, and orifice areas, Sp, are affected by heating conditions, too. The removal of thermal oxides influences the values of np/S, hp, and Sp, considerably. Possible causes of the observed phenomena are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo



POVEZANOST RADA


Projekt / tema
0120023

Ustanove
Fakultet strojarstva i brodogradnje, Zagreb