EFFECTS OF PRE-OXIDATION ON HOT CORROSION RESISTANCE OF Al–Si COATINGS

Haishuang Lv; Yanmei Li; Yabin Li; Naiwen Fan

doi:10.17222/mit.2022.645

Haishuang Lv Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China
Yanmei Li Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China
Yabin Li Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China
Naiwen Fan Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China

DOI: https://doi.org/10.17222/mit.2022.645

Keywords: superalloy, Al–Si coating, pre-oxidation, hot corrosion

Abstract

In this study, effects of pre-oxidation on the hot corrosion behaviour of Al–Si coatings in a Na₂SO₄ and 25 w/% NaCl mixture at 900 °C were investigated. The results showed that after 120 h of corrosion, a large amount of β-NiAl residual was found with no obvious sulphides or oxidation in the pre-oxidised Al–Si coating. The pre-formed oxide film on the pre-oxidised coating prevented external O^2– and species such as S^2– and Cl^– from the molten salts from directly contacting the coating and reduced the rate of TiO₂ formation in the oxide layer, thus forming an Al₂O₃-based oxide film and reducing the growth rate of the oxide film on the coating surface. Cracking and peeling of the oxide film, caused by the internal stress owing to the difference in the thermal expansion coefficient between the oxides in the oxide layer, are suppressed; thus, the hot corrosion resistance of the coating is significantly improved.

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Author Biographies

Yanmei Li, Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China

Associate Professor, State Key Laboratory of Rolling and Automation, Northeastern University

Yabin Li, Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China

Master degree candidate, State Key Laboratory of Rolling and Automation, Northeastern University

Naiwen Fan, Northeastern University, The State Key Laboratory of Rolling and Automation, Shenyang, China

Master degree candidate, State Key Laboratory of Rolling and Automation, Northeastern University

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