Effect of zinc anodes on the behaviour of antifouling coatings applied on copper alloys

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-02-16 DOI:10.1016/j.porgcoat.2025.109153

Erica Tubaro , Lorenzo Del Fabro , Matteo Pesle , Alessandra Bontempi , Lorenzo Fedrizzi , Francesco Andreatta

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Abstract

This study investigates antifouling coatings for the corrosion protection of bronze propellers in pleasure boats, cathodically protected by sacrificial anodes. Currently, no standards exist to evaluate their resistance to cathodic delamination. This work develops a specific testing procedure using electrochemical methods to assess cathodic delamination in coated bronze panels. Samples with various antifouling formulations were characterized for cathodic disbonding resistance and barrier properties, with coating morphology analysed via SEM. Accelerated cathodic disbonding tests in artificial seawater at −2 V vs Ag/AgCl were evaluated through Potentiodynamic and Potentiostatic Polarization and Electrochemical Impedance Spectroscopy (EIS).

Results showed that increasing pigment volume concentration (PVC) in the primer enhanced delamination resistance by limiting aggressive species transport. Adding a silane adhesion promoter further reduced delaminated areas and improved adhesion, though slightly reducing barrier properties due to increased water uptake. Replacing a graphite-containing topcoat with a titanium dioxide-based (white) one significantly improved both barrier properties and cathodic disbonding resistance. EIS confirmed that titanium dioxide coatings exhibited higher impedance than graphite-rich ones, due to the absence of conductive regions in the white topcoat.

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.