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Influence of silica nanoparticles on corrosion resistance of sol-gel based coatings on mild steel

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posted on 24.04.2019, 14:43 by LV Mora, S Naik, S Paul, R Dawson, A Neville, R Barker
For this study, unfunctionalised and functionalised nanoparticles of silica (SiO2) were incorporated into a sol-gel based matrix in an effort to provide more effective corrosion protection on a mild steel substrate. Tests such as atomic force microscopy (AFM) and white light interferometry (WLI) were carried out to characterise coating microstructure and properties. Corrosion protection and coating durability was investigated using different methods which included electrochemical impedance spectroscopy (EIS) and accelerated salt spray testing to simulate a marine environment. Electrochemical test results as well as results after exposure in the neutral salt spray test indicated that the addition of silica nanoparticles led to an improvement in corrosion resistance of the coating matrix. The most effective performance was observed when the nanoparticles were functionalised. Nanoparticle functionalisation helped to avoid agglomeration during incorporation leading to a more uniform nanoparticle distribution within the coating formulation and an improvement of the coating's ability to protect against corrosion.


The author would like to thank the Lloyd's Register Foundation for sponsoring this PhD research and the FCR, TCE and MPF Teams at TWI for their support. The author is also grateful to Chun Wang (University of Leeds) for her help with AFM imaging and to J.C.S. Fernandes (Instituto Superior Técnico, Lisboa, Portugal) for his help with the interpreting the electrochemical impedance results. [Lloyd's Register Foundation] is a charitable foundation, helping to protect life and property by supporting engineering-related education, public engagement and the application of research.



Surface and Coatings Technology, 2017, 324, pp. 368-375 (8)

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/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering


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Surface and Coatings Technology





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