Journal
CORROSION SCIENCE
Volume 174, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108808
Keywords
Metal matrix composites; Aluminium; TEM; De-alloying; Pitting corrosion; Segregation
Funding
- National Natural Science Foundation of China (NSFC) [U1508216]
- NSF of Liaoning Province [20180551101]
- research fund of SYNL [L2019F15]
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The present study reports an atomic level quasi in-situ TEM observation of the redistribution of alloying element Cu in the corrosion process of a B4C-reinforced Al-Mg-Si-Cu composite. Cu atoms were found to combine with Mg and form a thin layer at the interfaces between the aluminum matrix and nano-reinforcements (i.e. Mg(Al)B-2 and Al3BC). Dealloying of the Cu/Mg-rich layer was revealed. The following decomposition of Mg(Al)B-2 resulted in narrow corrosion trenches forming around Mg(Al)B-2 and then the localized pitting of the matrix. In addition, the liberated Cu ions were then redeposited and formed noble Cu nano-particles upon cathodic Mg(Al)B-2 and B4C particles.
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