Aljana Petek (Author), Sebastijan Kovačič (Author)

Abstract

The corrosion resistance of AISI 420 stainless steel in 0.1 mol $L^{−1}$ $H_2SO_4$ + 0.1 mol $L^{−1}$ $Na_2SO_4$ solutions at different pH-values and the inhibiting effect of $Ce^{3+}$ ions was studied using electrochemical polarization methods. The results reveal decreasing of the corrosion rate with an increasing the pH of the solution, which demonstrates the progressive protective character of the inhibitor used. At pH lower than 3.33, the corrosion inhibition was most probably a result of the competitive adsorption of $Ce^{3+}$ with $H^+$ ions on the cathodic sites of the electrode surface, and it was found to be dependent on the relative concentration of $H^+$/$Ce^{3+}$. The peroxide generated from the oxygen reduction reaction at pH 3.33 was found to be capable oxidize trivalent cerium (Ce) to the tetravalent state. As obtained hydroxide precipitates act as diffusion barrier hindering the corrosion processes, whereafter a spontaneous passivity occurs on the steel surface at this pH.

Keywords

acid corrosion;green corrosion inhibitor;stainless steel;electrochemical techniques;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 665.7.038.5
COBISS: 18054678 Link will open in a new window
ISSN: 1751-8253
Views: 858
Downloads: 296
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Other data

Secondary language: Slovenian
Secondary keywords: kislostna korozija;zeleni inhibitor za korozijske procese;nerjaveče jeklo;elektrokemijske tehnike;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 337-341
Volume: ǂVol. ǂ7
Issue: ǂno. ǂ4
Chronology: 2014
DOI: 10.1080/17518253.2014.952684
ID: 10850641