A SVET study of the inhibitive effects of benzotriazole and cerium chloride solely and combined on an aluminium/copper galvanic coupling model. (September 2016)

• Record Type: Journal Article
• Authors: Coelho, L.B.; Mouanga, M.; Druart, M.-E.; Recloux, I.; Cossement, D.; Olivier, M.-G.
• Is Part Of: Corrosion science. Volume 110(2016)
• Page Start: 143
• Page End: 156
• Publication Date: 2016-09
• Subjects: A. Aluminium -- A. Copper -- A. Rare earth elements -- B. SVET -- C. Neutral inhibition; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.04.036
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: SVET shows the galvanic corrosion for an aluminium/copper model in NaCl solutions. SVET depicts the inhibitive actions of benzotriazole and cerium chloride. Benzotriazole rapidly reacts with copper surfaces, but inhibition is non-persistent. Cerium ions react with the hydroxyl ions, blocking the copper surface after 46 h. A synergistic inhibitive effect is achieved by combining benzotriazole and cerium salt. Abstract: An aluminium/copper galvanic coupling model suitable for Scanning Vibrating Electrode Technique (SVET) analysis was elaborated with the aim of simulating a galvanic couple characteristic of AA 2024. The inhibitive effects brought by benzotriazole (BTA) and cerium chloride (CeCl3 ) on the Al/Cu model were evaluated, separately and combined, in neutral aerated sodium chloride solutions. A positive synergistic effect was revealed yielding permanent corrosion protection for 46 h of immersion. Complementary techniques such as UV spectrophotometry and ToF-SIMS were employed, respectively, to investigate the decomposition of BTA molecules and to confirm the chemical composition of a combined BTA-based/Cerium-based layer.