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- Title
Synergistic effects of Cl<sup>−</sup> and Cu<sup>2+</sup> ions on corrosion of pure Al and Al alloys in aqueous solutions at 363 K.
- Authors
Chiba, M.; Nakayama, Y.; Hiraga, T.; Takahashi, H.; Shibata, Y.
- Abstract
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-CuSO4 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 Cu2+ solution. The mass losses in a solution including both Cl− and Cu2+ ions at the same concentrations were 4 - 8 %, showing a synergistic effect of Cl− and Cu2+ 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 Cu2+ solution, while deposited on Si-enriched areas as well as on Al phases and Fe-enriched areas in the Cl−/Cu2+ solution. Copyright © 2013 John Wiley & Sons, Ltd.
- Subjects
CORROSION &; anti-corrosives; ALUMINUM alloys; AQUEOUS solutions; PIPE; AIR conditioning; METAL analysis
- Publication
Surface & Interface Analysis: SIA, 2013, Vol 45, Issue 10, p1626
- ISSN
0142-2421
- Publication type
Article
- DOI
10.1002/sia.5265