Abstract
Many companies in the power transformer industry are striving to speed up the drying process of coatings, which is why alternative drying methods are constantly being explored while maintaining the same coating protection properties. The infrared (IR) drying of protective coatings is a potential solution for their higher productivity, but has not yet been extensively investigated. In this paper, two solvent-borne coating systems, with and without zinc in the primer, from two different manufacturers, dried by infrared radiation and under atmospheric conditions, were studied. The coating systems consisted of epoxy primer, epoxy intermediate coat, and polyurethane topcoat. Anti-corrosion performance of the coatings was characterized using a salt spray chamber, pull-off adhesion testing, electrochemical impedance spectroscopy (EIS) investigation, and open circuit potential (OCP) measurement. All samples were analyzed using stereo microscope. A scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDX) for detailed study and chemical composition determination was used. The results showed that infrared technology notably reduced coating drying times while maintaining or improving anticorrosion performance properties compared to the coatings dried under atmospheric conditions.
Highlights
Due to its extensive applications in various industries such as automotive, household appliances, business machinery, and heavy construction, steel has become an important part of our life [1]
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Summary
Due to its extensive applications in various industries such as automotive, household appliances, business machinery, and heavy construction (marine, chemical), steel has become an important part of our life [1]. General recommendations for mild steel are that it should be used in an atmospheric rather than acid environment. To slow down the corrosion rate of mild steel in different environments, preventive measures must be used [2]. In this regard, the most common and useful methods for metal corrosion protection are cathodic protection [3,4] and application of organic coatings [5,6], corrosion inhibitors [7], and conversion coatings [8]. Organic coatings stand out as the most applied method whose protective efficiency consists of high resistance to ionic movement by creating a barrier between the substrate and the environment. To achieve satisfactory protection via a barrier mechanism, the recommended coating thickness must be applied. Good adhesion to the metal substrate and between different layers is crucial for good performance and durability [9,10]
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