Protective Film Formation on AA2024-T3 Aluminum Alloy by Leaching of Lithium Carbonate from an Organic Coating | Zendy

Y. Liu | Zendy; Peter Visser | Zendy; Xiaorong Zhou | Zendy; S.B. Lyon | Zendy; Teruo Hashimoto | Zendy; M. Curioni | Zendy; A. Gholinia | Zendy; G.E. Thompson | Zendy; Gerard Smyth | Zendy; Simon R. Gibbon | Zendy; Derek Graham | Zendy; J.M.C. Mol | Zendy; Herman Terryn | Zendy

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Protective Film Formation on AA2024-T3 Aluminum Alloy by Leaching of Lithium Carbonate from an Organic Coating

Author(s) -

Y. Liu,

Peter Visser,

Xiaorong Zhou,

S.B. Lyon,

Teruo Hashimoto,

M. Curioni,

A. Gholinia,

G.E. Thompson,

Gerard Smyth,

Simon R. Gibbon,

Derek Graham,

J.M.C. Mol,

Herman Terryn

Publication year - 2015

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/2.0021603jes

Subject(s) - materials science , corrosion , alloy , coating , lithium carbonate , metallurgy , leaching (pedology) , aluminium , layer (electronics) , substrate (aquarium) , salt (chemistry) , composite material , chemistry , ion , environmental science , organic chemistry , ionic bonding , soil science , soil water , oceanography , geology

An investigation into corrosion inhibition properties of a primer coating containing lithium carbonate as corrosion inhibitive pigment for AA2024 aluminum alloy was conducted. It was found that, during neutral salt spray exposure, a protective film of about 0.2 to 1.5 ?m thickness formed within the area where an artificial defect was introduced by scribing through the coating to the base alloy. This film showed a multilayered structure consisting of a relatively compact layer near the alloy substrate, a porous middle layer and a columnar outer layer. The thicknesses of the layers varied, as a consequence of the difference in the local concentration of lithium species leaching from the primer coating. The presence of the film in the scribed area significantly reduced corrosion of the alloy, with little consumption of the metal substrate within the scribed area during neutral salt spray exposure. Furthermore, the presence of the protective film resulted in a significant increase of impedance modulus, measured after the salt spray exposure.

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