Coatings are important in a range of industrial applications, such as architectural coatings, industrial coatings, packaging, inks and adhesives. They are indispensable for the protection of metals and alloys against corrosion. For the protection of aluminium alloys for example, traditionally chromates are used because they have good corrosion inhibiting characteristics. However, hexavalent chromium is carcinogenic, and thus, environment-friendly alternatives are sought. Moreover, conventionally coatings are made with organic species. Due to the negative impact of volatile organic compounds on the environment and health, the importance of alternative, water-based coatings have much increased overthe last years in the industry.
One of the challenges with alternative, protective coatings for metals and alloys is the potential deteriorating effect of corrosion inhibiting species on the barrier properties of the coating. In addition, the corrosion inhibitor should not be leached or depleted on short term. A solution for this is a smart coating where the inhibitor is only released where it is needed and at the moment when it is needed. Hence, a smart coating can respond to specific stimuli because the inhibitor is embedded in microcapsules or porous particles which are sensitive to these stimuli. A good compatibility between the microparticles and the coating matrix is thereby of crucial importance. Sustainability has become a very important aspect in our society. More and more we try to avoid producing waste, and we search for solutions to create a circular economy by for example using waste from one sector as a resource in another sector. In this project we will make use of inorganic food waste as a resource for components in the smart coatings we are developing.
The overall aim of the project is to develop sustainable, smart coatings that act as anti-corrosion protection on metal surfaces. The sustainability aspect of those coatings is focused on the use of inorganic food waste particles, and the use of safe and ecological constituents.
The following tasks will be performed:
- Literature study on smart coatings for metal surfaces
- Characterization of inorganic food waste material, and development of a protocol for the treatment of this material and impregnation with corrosion inhibitor
- Design and synthesis of a series of coatings whereby several parameters are tested (composition, temperature, additives)
- Characterization of the synthesized coatings and their performance and properties
- Interpretation of results, comparison with literature, and writing of thesis
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