Naslov
Elektrokemijsko istraživanje svojstava oksidnog filma na visokolegiranom čeliku 304 u fluoridnom mediju
(Electrochemical investigation of properties of oxide film on stainless steel 304 in fluoride media)

Autori
Mišković, Ivana ; Pilić, Zora

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Radovi HDZU - XIV-XV

Urednik/ci
Baotić, Josip

Izdavač
Hrvatsko društvo za znanost i umjetnost BiH

Grad
Sarajevo

Godina
2013

Raspon stranica
178-189

ISBN
978-9958-688-57-7

Ključne riječi
visokolegirani čelik 304, fluoridni ion, pasivni film, ciklička voltametrija, elektrokemijska impedancijska spektroskopija, točkasti defekti
(Stainless steel 304, Fluoride ion, Passive film, Cyclic voltammetry, Electrochemical impedance spectroscopy, Point defects)

Sažetak
The properties of the oxide film formed on stainless steel 304 in deaerated 0.01 and 0.1 mol L−1 NaF solutions with different pH values were studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Results revealed that corrosion of stainless steel 304 increases with increasing concentration of fluoride ions. In 0.01 mol L-1 NaF, pH = 4.5 corrosion rate was 0.45 g cm-2 h-1, while in 0.1 mol L-1 NaF, pH = 4.5 corrosion rate increases to 1, 58 g cm-2 h-1. Influence of pH value on corrosion rate was negligible in studied experimental conditions. The experimental data are interpreted in terms of the point defect model for passivity of stainless steel 304, assuming that predominant point defects on passive film of stainless steel 304 are cation vacancies. Diffusivity and concentration of point defects were estimated from the Warburg - type impedance.

Izvorni jezik
Hrvatski

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