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Surface and corrosion properties of AA6063-T5 aluminum alloy in molybdate-containing sodium chloride solutions

Kharitonov, Dmitry S. ; Dobryden, Illia ; Sefer, Birhan ; Ryl, Jacek ; Wrzesińska, Angelika ; Makarova, Irina V. ; Bobowska, Izabela ; Kurilo, Irina I. ; Claesson, Per M.

Corrosion science, 2020-07, Vol.171, p.108658, Article 108658 [Periódico revisado por pares]

Amsterdam: Elsevier Ltd

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Título:
Surface and corrosion properties of AA6063-T5 aluminum alloy in molybdate-containing sodium chloride solutions
Autor: Kharitonov, Dmitry S. ; Dobryden, Illia ; Sefer, Birhan ; Ryl, Jacek ; Wrzesińska, Angelika ; Makarova, Irina V. ; Bobowska, Izabela ; Kurilo, Irina I. ; Claesson, Per M.
Assuntos: Aluminum ; Aluminum alloys ; Aluminum base alloys ; Aluminum chloride ; Aluminum corrosion ; Corrosion ; Corrosion inhibitors ; Corrosion mechanisms ; Corrosion property ; Corrosive effects ; Electric force microscopy ; Electrostatic force ; Electrostatic force microscopy ; Engineering Materials ; Intermodulation ; Iron ; Magnetic fields ; Magnetic force ; Materialteknik ; Mechanism of corrosion ; Molybdate inhibitor ; Molybdates ; Molybdenum compounds ; Oxidation ; Oxidation-reduction mechanism ; Raman spectroscopy ; Scanning probe microscopy ; SEM ; Sodium alloys ; Sodium chloride ; Sodium chloride solution ; Spectroscopic measurements ; Surface layers ; XPS
É parte de: Corrosion science, 2020-07, Vol.171, p.108658, Article 108658
Descrição: •Intermodulation electrostatic force microscopy revealed variations of Volta-potential over the AA6063-T5 alloy with high spatial resolution.•Fe-rich intermetallic particles in the AA6063-T5 alloy are initiation cites for the molybdate inhibition process.•XPS and confocal Raman measurements revealed the chemical state of molybdenum compounds.•The inhibition effect is provided by a surface film consisting of mixed Mo(IV), and Mo(V), Mo(VI) species.•The inhibition mechanism by aqueous molybdate species has been proposed. Corrosion properties of aluminum alloy AA6063-T5 were investigated in molybdate-containing NaCl solutions. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. SEM-EDX, magnetic force, and intermodulation electrostatic force microscopy data suggested that the inhibition initiation preferentially occurred over Fe-rich cathodic IMPs. Spectroscopic measurements demonstrated that the formed surface layer consists of mixed Mo(VI, V, IV) species. This layer provided inhibition with an efficiency of ∼90% after 4 h of exposure. High efficacy of ∼70% was achieved even after one week of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition by aqueous molybdates was proposed.
Editor: Amsterdam: Elsevier Ltd
Idioma: Inglês

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Surface and corrosion properties of AA6063-T5 aluminum alloy in molybdate-containing sodium chloride solutions

Kharitonov, Dmitry S. ; Dobryden, Illia ; Sefer, Birhan ; Ryl, Jacek ; Wrzesińska, Angelika ; Makarova, Irina V. ; Bobowska, Izabela ; Kurilo, Irina I. ; Claesson, Per M.

Amsterdam: Elsevier Ltd

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