Work

Molybdate and vanadate ions as corrosion inhibitors for clad aluminium alloy 2024-T3

Year: 2024

Type: article

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.

Source: Electrochimica Acta

DOI: 10.1016/j.electacta.2024.144893

Authors: Ingrid Milošev, Tjaša Pavlovčič, Matija Tomšič

Language: English

Topic: Corrosion Behavior and Inhibition

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,870

Funder: Javna Agencija za Raziskovalno Dejavnost RS

Awards: Nanoplastics in aqueous environments: structure, migration, transport and remediation, Advanced materials for low-carbon and sustainable society, Physical chemistry