A novel approach used to study the corrosion susceptibility of metallic materials at a dynamic seawater/air interface

• Published in: Corrosion communications Vol. 6; pp. 62 - 66
• Main Authors: Xia, Da-Hai, Mao, Yingchang, Zhu, Yu, Yuan, Quan, Deng, Cheng-Man, Hu, Wenbin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2022; Elsevier
• Subjects: Aluminum alloy; EIS; Localized corrosion; Seawater/air interface; Localized corrosion; Seawater/air interface; EIS; Aluminum alloy
• ISSN: 2667-2669; 2667-2669
• DOI: 10.1016/j.corcom.2022.03.001

•A novel seawater/air interfacial measurement device is constructed.•An electrochemical sensor is used to study the localized corrosion susceptibility.•Aluminum exposed to the interfacial region show better corrosion resistance than that in the full immersion region. A novel device is constructed to study the localized corrosion susceptibility of 2024 aluminum alloy at a dynamic seawater/air interface. Corrosion in three distinct regions are identified: full immersion region, seawater/air interfacial region (alternant wet/dry region), and atmosphere region. The corrosion process in the interfacial region over time was studied by EIS and the corrosion product was characterized by SEM. Experimental results revealed that, a layer of intense and uniform corrosion product was formed on the seawater/air interfacial region, due to the oxygen enrichment in that region. Pitting corrosion was more severe in the full immersion region than that in the seawater/air interface, as verified by a lower charge transfer resistance and more severe pitting corrosion and intergranular corrosion extent.