Ingrid Milošev (Author), Tjaša Pavlovčič (Author), Matija Tomšič (Author)

Abstract

Molybdate and vanadate ions were used as corrosion inhibitors for the clad aluminium alloy 2024-T3 in chloride solution to investigate the differences in their inhibitory effect. Electrochemical measurements in 0.1 M NaCl investigated the influence of inhibitor concentration from 0.5 mM to 250 mM, solution pH from 5 to 9 and immersion time at open circuit potential of up to 12 h. Both compounds act predominantly as anodic inhibitors; however, the effect of molybdate increases significantly at concentrations above 50 mM and leads to a broad passive range. Surface analysis of the samples exposed to inhibitor performed by X-ray photoelectron spectroscopy showed that the inhibitor layers consist of oxides of multiple valences. Scanning electron microscopy with chemical analysis was also used to characterise the inhibitor layers. Equilibrium diagrams of the aqueous species in the selected concentration range were generated to better understand the inhibition mechanism and to correlate the electrochemical data and data on surface properties.

Keywords

molybdate;corrosion inhibitors;aqueous chemistry;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: IJS - Jožef Stefan Institute
Publisher: Elsevier
UDC: 54
COBISS: 205238275 Link will open in a new window
ISSN: 1873-3859
Views: 20
Downloads: 4
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Other data

Secondary language: Slovenian
Secondary keywords: Aluminijeve zlitine;Vanadati;Protikorozijska zaščita;Vrstična elektronska mikroskopija;Rentgenska fotoelektronska spektroskopija;
Type (COBISS): Article
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 26. 8. 2024;
Pages: str. 1-21
Issue: ǂVol. ǂ504, [article no.] 144893
Chronology: Nov. 2024
DOI: 10.1016/j.electacta.2024.144893
ID: 26235552