A PROPOSAL FOR MODIFIED GALVANIC CORROSION MODEL: INVESTIGATING EFFECTS OF MICRO-ARC OXIDATION ON Al ALLOY

Yuanhang Yang (), Yanhong Gu, Jian Liang and Wen Yue ()
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Yuanhang Yang: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 QingyuanBeilu, Huangcun, Daxing District, Beijing 102617, P. R. China
Yanhong Gu: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 QingyuanBeilu, Huangcun, Daxing District, Beijing 102617, P. R. China
Jian Liang: #x2020;Institute of Exploration Techniques, Chinese Academy of Geological Sciences, No. 77, Jinguang Road, Langfang City, Hebei 065000, P. R. China
Wen Yue: #x2021;School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 02, 1-12

Abstract: Corrosion is generally an undesirable phenomenon in most engineering applications. The effects of micro-arc oxidation (MAO) coating on Al alloy on the galvanic corrosion performance have been studied. The surface micro-structures were characterized using scanning electron microscope (SEM) and metallographic microscope before and after corrosion. Electrochemical studies on the corrosion behaviors have been reported by using open circuit potential (OCP) and potentiodynamic polarization (PDP) measurements in a slurry solution. All measurements were consistent with each other and showed that the MAO coating can significantly reduce the corrosion rate of Al alloy. A model for elucidating corrosion mechanism and corrosion process of the MAO coating on Al alloy is proposed.

Keywords: Galvanic corrosion; Al alloy; micro-arc oxidation; drill pipe joint; corrosion model (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501470

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