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

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

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.

• Language: English
• Keywords: molybdate, corrosion inhibitors, aqueous chemistry, aluminium alloy, clad AA2024-T3, vanadate, XPS, SEM
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 21 str.
• Numbering: Vol. 504, art. 144893
• PID: 20.500.12556/RUL-160331
• UDC: 54
• ISSN on article: 1873-3859
• DOI: 10.1016/j.electacta.2024.144893
• COBISS.SI-ID: 205238275
• Publication date in RUL: 26.08.2024

Record is a part of a journal

• Title: Electrochimica acta
• Publisher: Elsevier, International Society of Electrochemistry
• ISSN: 1873-3859
• COBISS.SI-ID: 135479555

Licences

• License: CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Keywords: aluminijeve zlitine, vanadati, protikorozijska zaščita, vrstična elektronska mikroskopija, rentgenska fotoelektronska spektroskopija