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Cathodic protection of 75% zinc-rich coatings compared under immersion and atmospheric conditions: Protection for defect areas

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Corrosion Communications 2021年第4期4卷 12-22页

作者： Wenting Xia Zhiwei Chen Guoqing Zhang Fuguo Liu Zhifeng Lin Wei Zhang School of Chemical Engineering and Technology Sun Yat-sen University Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Offshore Oil Engineering Co. Ltd.

The study aimed to explore the cathodic protection of the defect areas of 75 wt.% zinc-rich coatings(ZRCs) under immersion and atmospheric thin liquid film conditions using a wire beam electrode(WBE). Besides, electrochemical impedance spectroscopy, scanning electron microscopy, and surface morphology analysis were used. Under both experimental conditions, high ZRCs content polarised the entire electrode to the protective potential range,thereby reversing the polarity of the defect area steel substrate to cathodic to prevent corrosion. The higher concentration of dissolved oxygen in the surface liquid film and coating activated the zinc powder faster and provided a higher cathodic protection current for the defect area under the atmospheric liquid film ***, WBE corrosion potential shifted more negative under the atmospheric liquid film condition, thereby conveying longer-lasting cathodic protection and reducing the corrosion rate of the defect area steel *** with the traditional sheet electrode, WBE can provide the current distribution and change information of cathodic protection at the local defects on the ZRCs surface, thereby providing a reliable test and a method for evaluating heterogeneous corrosion and cathodic protection.

关键词： zinc-rich coatings Local defect Cathodic protection Thin liquid films Wire beam electrode

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A sandwich-like structure hybrid coating of cold galvanizing coating/polydopamine on hot-dip galvanized steel with enhanced adhesion and corrosion resistance

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Science China(Technological Sciences) 2023年第8期66卷 2381-2395页

作者： LI JiWen GAO NingJie ZHANG WanYu XU Long NWOKOLO Kenneth Izuchukwu WU Hao LIU FuChun HAN En-Hou Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Corrosion Science and Technology Guangzhou 510530China Jihua Laboratory Foshan Guangdong ProvinceFoshan 528000China

This study aims to enhance the adhesion strength and anti-corrosion performance of the cold galvanizing coating(CGC)applied on the hot-dip galvanized steel(HDG).Polydopamine(PDA)is deposited on the HDG surface with different time ranges and as an interlayer between CGC and HDG through covalent *** surface morphology and the covalent interaction between PDA/HDG are exhibited by scanning electron microscope(SEM),atomic force microscopy(AFM)and X-ray photoelectron spectroscopy(XPS).The pull-off adhesion tests before and after neutral slat spry tests show an enhanced dry adhesion strength and less adhesion loss of the hybrid CGC/PDA coated HDG compared with the direct CGC coated *** addition,open circuit potential(OCP)reveals that the corrosion protection performance of the hybrid CGC/PDA coated HDG increases by 200%(up to 201 d)and the corrosion density icorrattaining about 4.45×10^(-7)A/cm^(2).Electrochemical impedance spectroscopy(EIS)measurements and X-ray diffraction(XRD)analysis confirm that the precipitate of the stable chelation formed by PDA and Zn^(2+)between CGC and HDG substrate can also improve the corrosion protection *** a strategy of strengthening adhesion and forming the chelate compound at the HDG surface promises a new route to corrosion protection of CGC on HDG.

关键词： dopamine zinc-rich coatings hot-dip galvanized steel corrosion protection chelate compound

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