Journal
CORROSION SCIENCE
Volume 179, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109113
Keywords
Aluminum; Rare earth elements; Polarization; Pitting corrosion
Funding
- National Natural Science Foundation of China [51771210, 51971227, 51901231]
- Chinese Academy of Sciences Strategic Priority Program on Space Science [XDA15013800]
- Science and technology project of the headquarters of SGCC [5500201924129A-0-0-00]
- Science and Technology Project of Fujian Province [2018T3001]
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The study found that micro-alloying element La can improve the corrosion resistance of Al-Mg-Si alloys by forming Mg2Si particles with a La-rich surface shell and isolated Si particles, which slows down the corrosion rate and inhibits localized corrosion.
The effect of micro-alloying element La on the corrosion behavior of Al-Mg-Si alloys in 3.5 wt. % NaCl solution was investigated. The results demonstrate that micro-alloying La causes the formation of a microstructure with discrete short-rod like Si particles and Mg2Si particles with a La-rich surface shell. The La-rich shell slows down the dissolution of the Mg2Si particles and mitigates the localized corrosion around the Mg2Si particles. The isolated Si particles hinder the corrosion propagation along grain boundaries. As a result, micro-alloying element La causes a significant improvement in the corrosion resistance of Al-Mg-Si alloys.
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