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Corrosion of AD31 (AA6063) Alloy in Chloride-Containing Solutions
Belarusian State Technological University, Belarus ; KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
Luleå University of Technology, Sweden.
Belarusian State Technological University, Belarus.
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2018 (English)In: Protection of Metals and Physical Chemistry of Surfaces, ISSN 2070-2051, Vol. 54, no 2, p. 291-300Article in journal (Refereed) Published
Abstract [en]

Corrosion of AD31 (AA6063) alloy in neutral 0.05 M NaCl solutions is investigated via scanningprobe microscopy, linear-sweep voltammetry, and electrochemical-impedance spectroscopy. Al−Fe−Si−Mg intermetallic particles are determined to prevail in the structure of alloy and act as local cathodes. Intermodulation electrostatic-force-microscopy imaging shows that their Volta potential differs by 570 mV from that of the host aluminum matrix, making the alloy prone to localized corrosion. We show that the corrosion of alloy in the studied electrolyte mainly develops locally and results in pitting, with charge transfer being the limiting stage of the process. A mechanism of corrosion of the AD31 (AA6063) alloy in neutral chloride-containing solutions is proposed.

Place, publisher, year, edition, pages
2018. Vol. 54, no 2, p. 291-300
Keywords [en]
Aluminum corrosion, Charge transfer, Electric force microscopy, Electrochemical corrosion, Electrochemical impedance spectroscopy, Electrolytes, Electrostatic force, Localized corrosion, Sodium chloride, Aluminum matrix, Electrostatic force microscopy, Inter-metallic particle, Limiting stage, Linear sweep voltammetry, Mechanism of corrosion, NaCl solution, Volta potential, Sodium alloys
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34068DOI: 10.1134/S2070205118020077Scopus ID: 2-s2.0-85046546854OAI: oai:DiVA.org:ri-34068DiVA, id: diva2:1231308
Note

This work was supported by the Swedish Institute Visby Programme and the Ministry of Education of the Republic of Belarus (grant no. 20161135).

Available from: 2018-07-06 Created: 2018-07-06 Last updated: 2018-07-06Bibliographically approved

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