Preparation of Multistage Coating on Aluminum Alloy and Corresponding Anti-corrosion and Anti-biofouling Properties

NI Yingying; KE Nan; CHEN Jiongming; YAN Shiqi; JIAN Wenyuan; LIU Hongwei

doi:10.7643/issn.1672-9242.2025.06.008

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (6) : 66-74. DOI: 10.7643/issn.1672-9242.2025.06.008

Ships and Marine Engineering Equipment

Preparation of Multistage Coating on Aluminum Alloy and Corresponding Anti-corrosion and Anti-biofouling Properties

NI Yingying, KE Nan, CHEN Jiongming, YAN Shiqi, JIAN Wenyuan, LIU Hongwei^*

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Abstract

The work aims to solve the corrosion problem of aluminum alloy equipment in marine environments. In this work, a multistage coating was prepared on high-strength 7075 aluminum alloy by in-situ synthesis of layered bimetallic hydroxide (LDH) and epoxy resin coatings. The results showed that a Zn-Al LDH-NO₃^- coating was successfully grown in situ on the aluminum alloy surface, which could improve the interface bonding state between the coating and the aluminum alloy substrate. Mg-Al LDH-SPT nano-filler was successfully synthesized by co-precipitation method. Sodium pyrithione (SPT), which had antibacterial and corrosion inhibition properties, played a key role in improving the coating performance. In conclusion, Mg-Al LDH-SPT nanoparticles are introduced into epoxy resin to prepare ZL-MLSPT@EP coatings with excellent anti-corrosion and anti-fouling properties. The multistage coating based on the bottom Zn-Al LDH-NO₃^- coating and the outer ZL-MLSPT@EP coating provides support for solving the corrosion problems of aluminum alloy equipment in marine environments.

Key words

7075 aluminum alloy / LDH coating / epoxy coating / corrosion / anti-corrosion / anti-biofouling

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NI Yingying, KE Nan, CHEN Jiongming, YAN Shiqi, JIAN Wenyuan, LIU Hongwei. Preparation of Multistage Coating on Aluminum Alloy and Corresponding Anti-corrosion and Anti-biofouling Properties[J]. Equipment Environmental Engineering. 2025, 22(6): 66-74 https://doi.org/10.7643/issn.1672-9242.2025.06.008

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