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Effects of copper and manganese cations on cerium-based conversion coating on galvanized steel:Corrosion resistance and microstructure characterizations

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Journal of Rare Earths 2022年第6期40卷 1002-1006,I0006页

作者： Farzaneh Khast Mesbah Saybani Ali Asghar Sarabi Dariani Corrosion Engineering and Material Protection Group Bandar Abbas CampusAmirkabir University of TechnologyTehranIran Department of Maritime Engineering Amirkabir University of TechnologyTehranIran Department of Color and Polymer Engineering Amirkabir University of TechnologyTehranIran

The cerium conversion coating(CeCC) containing copper and manganese cations was applied to the galvanized steel.The microstructure and the composition of specimen were analyzed by field emission scanning electron microscopy(FE-SEM) and energy dispersive spectroscopy(EDS).Electrochemical impedance spectroscopy(EIS) and polarization tests were conducted in 3.5 wt% NaCl solution to investigate the coating corrosion resistance.The results show that there are improvements in corrosion resistance and microstructure of CeCC containing copper and manganese cations but copper ions increase corrosion resistance of CeCC from 5800 to 27000 Ω·cm^(2).

关键词： conversion coating Galvanized steel EIS Copper Manganese Rare earths

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

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Rare Metals 2016年第10期35卷 747-757页

作者： Li-Hua Fu Chao-Fang Dong Xiao-Gang Li Wei Han Corrosion and Protection Center Key Laboratory for Corrosionand Protection (MOE) University of Science and Technology Beijing Beijing 100083 China Research Institute of Functional Materials Central Iron and Steel Research Institute Beijing 100081 China

A composite conversion coating was prepared on magnesium alloy by the only one-step immersion treatment. The characteristics of the conversion coating were investigated by scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy （XPS）. The results indicate that the composite conversion coating consists of magnesium hydroxide, magnesium phosphate and man- ganese phosphate. The electrochemical behavior of the conversion coating was investigated systematically by electrochemical impedance spectroscopy （EIS） and poten- tiodynamic polarization measurement in different NaC1 solutions. Polarization measurements and EIS results reveal that the magnesium alloy with the conversion coating have better corrosion resistance compared to the bare magnesium alloy in these conditions. And the corro- sion rate of the magnesium alloy with conversion coating increases consistently with the chloride ion concentration. In alkaline conditions, the magnesium alloy with conver- sion coating has superior corrosion resistance by the syn- ergistic effects between Mg（OH）2 film and conversion coating. Moreover, the electrochemical corrosion mechanism of the magnesium alloy was analyzed with respect to the conversion coating in a Cl^- containing environment.

关键词： Electrochemical behavior Magnesium alloy conversion coating Corrosion

CORROSION BEHAVIOR OF A ZIRCONIUM-TITANIUM BASED PHOSPHONIC ACID conversion coating ON AA6061 ALUMINIUM ALLOY

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Acta Metallurgica Sinica(English Letters) 2008年第4期21卷 269-274页

作者： S.H. Wang C.S. Liu F.J. Shan Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110004 China Material ＆ Chemical Engineering College Liaoning University of Technology Jinzhou 121001 China

The conversion coating was formed by dipping AA6061 in a fluorotitanate/zirconate acid and amino trimethylene phosphonic acid （ATMP） solution at room temperature. The formation process and the anti-corrosion performance of the conversion coating were investigated using electrochemical test and salt spray test （SST）, respectively. The electrochemical test shows that the Zr/Ti and ATMP coating improves the corrosion resistance of AA6061 as good as the chromate （VI） coating. But the results of SST show that the corrosion resistance of Zr/Ti and ATMP coating is not as good as the chromate （VI） coating. The corrosion area is less than 2% after 72 h.

关键词： Corrosion resistance Fluorotitanate/zireonate acid Phosphonic acid Aluminium alloy conversion coating

Progress in bioactive surface coatings on biodegradable Mg alloys:A critical review towards clinical translation

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Bioactive Materials 2023年第1期19卷 717-757页

作者： Navdeep Singh Uma Batra Kamal Kumar Neeraj Ahuja Anil Mahapatro Department of Metallurgical and Materials Engineering Punjab Engineering CollegeChandigarh160012India Department of Mechanical Engineering Punjab Engineering CollegeChandigarh160012India Department of Biomedical Engineering Wichita State UniversityWichitaKS67260United States

Mg and its alloys evince strong candidature for biodegradable bone implants,cardiovascular stents,and wound closing devices.However,their rapid degradation rate causes premature implant failure,constraining clinical applications.Bio-functional surface coatings have emerged as the most competent strategy to fulfill the diverse clinical requirements,besides yielding effective corrosion resistance.This article reviews the progress of biodegradable and advanced surface coatings on Mg alloys investigated in recent years,aiming to build up a comprehensive knowledge framework of coating techniques,processing parameters,performance measures in terms of corrosion resistance,adhesion strength,and biocompatibility.Recently developed conversion and deposition type surface coatings are thoroughly discussed by reporting their essential therapeutic responses like osteogenesis,angiogenesis,cytocompatibility,hemocompatibility,anti-bacterial,and controlled drug release towards in-vitro and in-vivo study models.The challenges associated with metallic,ceramic and polymeric coatings along with merits and demerits of various coatings have been illustrated.The use of multilayered hybrid coating comprising a unique combination of organic and inorganic components has been emphasized with future perspectives to obtain diverse bio-functionalities in a facile single coating system for orthopedic implant applications.

关键词： Mg alloys Corrosion resistance Bio-functionality conversion coating Multilayered hybrid coating coating failures

Superhydrophobic surface of Mg alloys:A review

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Journal of Magnesium and Alloys 2018年第1期6卷 59-70页

作者： M.Yeganeh N.Mohammadi Department of Materials Science and Engineering Faculty of EngineeringShahid Chamran University of AhvazAhvazIran

In the present review,the formation of superhydrophobic(SHP)structures on the surface of Mg alloys was investigated.Different methods including hydrothermal technique,chemical and electrochemical deposition,conversion and polymer coating,and etching routes were discussed.The superhydrophobicity could form on the surface of Mg alloys by the application of different chemical,electrochemical,and physical methods followed by the immersion of these alloys in the solution containing modifying agents including fatty acids or long-chain molecules.The formed morphology,composition,and contact angle were reported and the effect of synthesis route on these characteristics was reviewed.

关键词： Mg alloys Superhydrophobic surfaces Chemical deposition Electrochemical coating conversion coating Polymer coating Etching