Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 5, Pages 1683-1690Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.09.151
Keywords
Aluminium alloys; Corrosion inhibitors; Cerium; Diphenylphosphate; Surface characterisation metals and alloys; Surfaces and interfaces; Scanning electron microscopy; Corrosion
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Funding
- Australian Centre of Excellence for Electromaterials Science
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Cerium diphenyl phosphate (Ce(dpp)(3)) has previously been shown to be a strong corrosion inhibitor for aluminium-copper magnesium alloy AA2024-T3 and AA7075 in chloride solutions. Surface characterisation including SEM and ToF-SIMS coupled with electrochemical impedance spectroscopy (EIS) measurements are used to propose a mechanism of corrosion inhibition which appears to involve the formation of a complex oxide film of aluminium and cerium also incorporating the organophosphate component. The formation of a thin complex film consisting of hydrolysis products of the Ce(dpp)3 compound and aluminium oxide is proposed to lead to the observed inhibition. SEM analysis shows that some intermetallics favour the creation of thicker deposits predominantly containing cerium oxide compounds. (C) 2010 Elsevier B.V. All rights reserved.
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