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Synergistic effects of Cl − and Cu 2+ ions on corrosion of pure Al and Al alloys in aqueous solutions at 363 K
Author(s) -
Chiba M.,
Nakayama Y.,
Hiraga T.,
Takahashi H.,
Shibata Y.
Publication year - 2013
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5265
Subject(s) - scanning electron microscope , aqueous solution , ion , corrosion , aluminium , metallurgy , mass spectrometry , chemistry , analytical chemistry (journal) , nuclear chemistry , materials science , composite material , chromatography , organic chemistry
Pipes of 3003/4043 clad aluminum alloys are used in air conditioning systems and are exposed to flowing relatively high‐temperature solutions (353 – 373 K). In the present investigation, the corrosion behavior of pure aluminum and 1050‐, 3003‐, and 4043‐aluminum alloys was examined by immersing in 1.57 × 10 −3 kmolm −3 ‐CuSO 4 and 0.57 kmolm −3 ‐KCl solutions at 363 K for 1 week. Mass losses of the specimens during the immersion were measured after removing corrosion products, and the specimen surfaces were characterized by scanning electron microscopy (SEM) and energy dispersive X‐ray spectrometry (EDS). Mass losses of all specimens examined were 0.1 – 0.7 % in the Cl − solution and 2–3 % in the Cu 2+ solution. The mass losses in a solution including both Cl − and Cu 2+ ions at the same concentrations were 4 – 8 %, showing a synergistic effect of Cl − and Cu 2+ ions. This effect was more with higher concentrations of Si in the Al alloys. The SEM and EDS analysis showed that Cu particles are deposited on Al phases and Fe‐enriched areas of the specimen surfaces in the Cu 2+ solution, while deposited on Si‐enriched areas as well as on Al phases and Fe‐enriched areas in the Cl − /Cu 2+ solution. Copyright © 2013 John Wiley & Sons, Ltd.