The effect of Sc and Yb microalloying additions and aged-hardening heat treatment on corrosion behavior of Al-Mg alloys
authors Tuan, NQ; Alves, AC; Toptan, F; Lopes, AB; Pinto, AMP
nationality International
journal MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
keywords SODIUM-CHLORIDE SOLUTION; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; SUBSTITUTING YTTERBIUM; PITTING CORROSION; SCANDIUM; AL3SC; ZR; MICROSTRUCTURE; PRECIPITATION
abstract Sc-containing Al alloys are potentially applied in saline environment. However, the corrosion behavior and its mechanisms of Sc-containing Al alloys have not been paid much attention. In this research, the corrosion behavior of Al-4Mg, Al-4Mg-0.3Sc, and Al-4Mg-0.24Sc-0.06Yb alloys was investigated in 3.5wt% NaCl solution by immersion and potentiodynamic polarization analysis. Scanning electron microscope (SEM), transmission electron microscopy (TEM) and high-resolution TEM were used to characterize intermetallic phases and localized corrosion. The results showed that the Fe-containing intermetallic particles are cathodic with respect to the matrix and can lead to localized corrosion, whereas the high content of Mg makes the Fe-containing intermetallic particle less noble to the matrix. Yb-containing intermetallic particles did not show any dissolution of the matrix at the periphery of these particles. The results indicated that active dissolution and localized corrosion were the dominant corrosion mechanisms for Al-4Mg alloy. However the polarization curves of Al-4Mg-0.3Sc and Al-4Mg-0.24Sc-0.06Yb alloys showed spontaneous passivation followed by pitting corrosion. Results suggested that age-hardening heat treatment improved the stability of the passive film on Al-4Mg-0.3Sc and Al-4Mg-0.24Sc-0.06Yb alloys.
publisher WILEY-V C H VERLAG GMBH
issn 0947-5117
year published 2016
volume 67
issue 1
beginning page 60
ending page 71
digital object identifier (doi) 10.1002/maco.201508404
web of science category Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000369846800006
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