Corrosion behaviour of zinc exposed to an extreme tropical marine atmospheric environment for 3 years. (4th July 2022)

• Record Type: Journal Article
• Authors: Liu, Yuwei; Gu, Tianzhen; Wang, Zhenyao; Cao, Gongwang; Wang, Chuang
• Is Part Of: Corrosion engineering, science, and technology. Volume 57:Number 5(2022)
• Page Start: 397
• Page End: 407
• Publication Date: 2022-07-04
• Subjects: zinc -- harsh marine atmosphere -- electrochemical analysis -- corrosion product layer structure; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2022.2071667
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: Corrosion behaviour of Zn exposed in the coastal zone of the Nansha Islands for nearly 3 years was studied through gravimetric, and morphological observations, component analysis, and electrochemical measurements. The kinetics of the corrosion process is linear, indicating that the corrosion products have no significant protective effect on the substrate. The average corrosion rate ( V d ) fluctuated with time, which was attributed to the different morphologies of corroded product film formed on the skyward and field-ward sides. Corrosion products formed on the skyward side had a three-layer structure in which Zn5 (OH)8 Cl2 ·H2 O was enriched in both the outer and inner layer, NaZn4 Cl(OH)6 SO4 ·6H2 O was enriched in the intermediate layer. Simultaneously, corrosion products formed on the field-ward side had a double-layer structure, in which Zn5 (OH)8 Cl2 ·H2 O was concentrated in the inner layer and NaZn4 Cl(OH)6 SO4 ·6H2 O was enriched in the outer layer. The degrees of corrosion on both sides at different exposure periods were also discussed.