Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
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Corrosion of Al-Alloys during Dry/Wet-Repeating Atmospheres with Pure Water and NaCl Solution
Shu SaitoTakuya HiragaMakoto ChibaYutaka ShibataHideaki Takahashi
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2014 Volume 63 Issue 11 Pages 570-574

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Abstract

Corrosion of A1050-, 3003- and 4043-Al alloys has been investigated by dry-wet repeating tests with droplets of NaCl solution and pure water at 323 K, and compared with that obtained by immersion tests.
Scanning electron microscopy and energy dispersive X-ray spectrometry showed that 50 - 100 μm-size pits are formed at edge areas of NaCl droplet, while a local dissolution of Al occurs around Fe–Al–intermetallic compound phase and Si-phase at central regions of the droplets, being similar to the behavior during immersion tests in a NaCl solution. In the case of pure-water dry-wet repeating atmospheres, needle like crystalline hydroxide films are formed at edge areas of pure water-droplets, while thin amorphous hydroxide films are formed at the central regions.

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© 2014 Japan Society of Corrosion Engineering
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