Dual Antifouling Mechanisms Induced by Cupric Ions and Needle-Like Alumina in Arc-Sprayed Composite Coatings
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Dual Antifouling Mechanisms Induced by Cupric Ions and Needle-Like Alumina in Arc-Sprayed Composite Coatings Xiaoxia Wang1 • Xin Wang2 • Qun Huang1 • Jiahao Qin1 • Xinkun Suo1 Andre´ McDonald3 • Hua Li1
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Submitted: 26 May 2020 / in revised form: 5 July 2020 / Published online: 24 September 2020 ASM International 2020
Abstract Aluminium-polymethyl methacrylate-copper (Al-PMMA-Cu) composite coatings were developed using cored wire arc spraying. The bacteria Bacillus sp. was used to evaluate the antifouling performances of the coatings. The microstructures and antifouling mechanisms of the coatings were investigated and discussed. The results show that the composite coatings presented improved antifouling performances, and two antifouling mechanisms were explored. On the one hand, the Cu nano-particles were released to seawater due to corrosion of the Al components, converted to cupric ions, and killed the bacteria. Meanwhile, oxidation of Al was accelerated due to Cu-Al galvanic reaction, and the needle-like corrosion products were formed, which pierced the cell membranes and killed the bacteria. The effects of the PMMA on the electrochemical properties of the coatings were also evaluated. The results show that the sealing function of the PMMA components enhanced the corrosion resistance of the Al-PMMA-Cu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11666-020-01076-9) contains supplementary material, which is available to authorized users. & Xinkun Suo [email protected] & Hua Li [email protected] 1
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2
Ningbo Jiangbei Gofront Herong Electric Co., LTD, Ningbo 315201, China
3
Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
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coatings. This investigation shed light on one-step construction of antifouling and anticorrosion layers for marine applications. Keywords arc spraying bacteria biofouling composite coatings corrosion
Introduction Corrosion and biofouling are major problems affecting service longevity of industrial facilities in the marine environment (Ref 1). Among established strategies to prevent or alleviate biofouling, thermal spraying is an effective way to provide a long-term protection due to the advantages of easy operation and low cost (Ref 2, 3). Thermal-sprayed aluminium (Al) coatings on steel structures present good corrosion resistance due to the cathodic protection effect (Ref 4). In addition, sealing using organic sealants could effectively decrease permeation of seawater and thus improve corrosion resistance of thermal-sprayed Al coatings (Ref 5). Facing to the threat of biofouling, thermal-sprayed Al coatings are also expected to possess the antifouling capability. Surface chemical modification is a promising method to fabricate an
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