Journal
ELECTROCHIMICA ACTA
Volume 107, Issue -, Pages 358-378Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.06.022
Keywords
Plasma electrolytic oxidation; Al-Cu-Li alloy; Cuprite; Dry sliding wear; Discharge types
Categories
Funding
- National Science Foundation of China [51071066]
- Programme for New Century Excellent Talents in University of the Education Ministry of China [NCET-12-0172]
- EPSRC [EP/H020047/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
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Coatings have been produced on an 2A97 Al-Cu-Li alloy by plasma electrolytic oxidation (PEO) using dilute and concentrated sodium silicate solutions with pulsed electrical regimes. Brownish red coatings were formed, especially in the dilute silicate solution. The colour is attributed to cuprite, formed by oxidation of copper in the alloy. The main phases of the coatings formed in the dilute and concentrated electrolytes are gamma-Al2O3 and mullite, respectively. A bi-layer coating is formed in the dilute electrolyte, with large pores between the layers. The outer layer contains a small amount of delta-Al2O3 and ot-Al2O3. Coatings formed using both electrolytes provided good corrosion resistance. The wear resistance was superior for the coating formed in the dilute electrolyte, since the outer layer is compact and of high strength and after the removal of the outer layer, a more adherent inner layer, with a hardness of 9-12 GPa, provides excellent protection. Based on the coating microstructure, a modified model of coating growth was proposed. (C) 2013 Elsevier Ltd. All rights reserved.
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