Adapted synthesis routes and healing evaluation of a self-healing anticorrosive coating
- PDF / 3,460,263 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 15 Downloads / 132 Views
Adapted synthesis routes and healing evaluation of a self-healing anticorrosive coating Ana Carolina Moreira Silva, Reny Angela Renzetti, Andreza de Sousa Andrada, Puja Singh, Pradeep K. Rohatgi, Merceˆs Coelho da Silva
Ó American Coatings Association 2020 Abstract In the past two decades, self-healing coatings have emerged as a potential alternative approach to enhance the life span of structural metal components constantly exposed to aggressive environments. In this work, we aimed to obtain capsules smaller than 1 lm containing an appropriate amount of oil seeking to provide efficient self-healing. A modification in the route of synthesis of self-healing coating capsules is proposed. This modification of a typical synthesis route, which consisted of introducing an additional mechanical agitation step before adding a formaldehyde aqueous solution, was used to entrap linseed oil as a healing agent in poly(urea–formaldehyde). Hence, two synthesis routes were investigated: one involving mechanical agitation at high-speed rotation and another which combines mechanical and ultrasonic agitation. The capsules obtained by agitation had average sizes of 0.35 ± 0.13 and 0.37 ± 0.19 lm and an oil content of 80 ± 2.2 and 77 ± 1.7 wt%, respectively. Both were incorporated, separately, into an epoxy resin matrix, and the composite was applied onto ASTM A36 steel plates for evaluation of healing crack filling performance and accelerated corrosion testing. Scanning electron microscope images showed that the two coatings had a similar healing effect, mainly due to their similar estimated oil content. Keywords Corrosion, Self-healing, Coatings, Linseed oil, Capsules
A. C. M. Silva, R. A. Renzetti, A. de SousaAndrada, M. C. da Silva (&) Instituto de Engenharias Integradas (IEI) da Universidade Federal de Itajuba´, Itabira, Minas Gerais 35903-087, Brazil e-mail: [email protected] P. Singh, P. K. Rohatgi College of Engineering and Applied Science, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
Introduction Carbon steels are extensively used in engineering due to their good mechanical properties such as ductility, tensile strength, and toughness. However, metals, especially those used in structural application and industry components, are highly susceptible to corrosive attacks, wear, and mechanical failure with resulting economic losses.1,2 The global cost of loss to corrosion is estimated to be US $2.5 trillion, corresponding to 3.4% of the global gross domestic product (GDP).3 Painting and/or coating is a simple and efficient method used in metal surface protection. Although effective, these barriers are prone to damage caused by mechanical stress-induced defects, such as microcracks and fissures, which are often difficult to detect.1–5 Recent studies have investigated material properties looking to prolong the life span of metallic materials, especially those used in structural applications, such as piping, machines, and other industrial infrastructural components, thereby improving their performance and re
Data Loading...
