Abstract
Scrap tires continue to be a major source of waste due to the lack of valuable and effective disposal routes. A viable solution to this problem is to recycle crumb rubber (CR)—a granulated material derived from scrap tires—and use it to develop other valuable products. Herein we report the fabrication and characterization of CR-modified coatings with anticorrosive properties on metal substrates. By varying the particle size and concentration of CR, we have determined the coating composition that offers the highest level of erosion protection. Images from a scanning electron microscope (SEM) reveal that CR is homogenously dispersed in the coating, especially when fine particles are used. As the concentration of CR increases, the hardness of the coating decreases as a result of the elastic properties of CR. More importantly, the erosion rate of the coating decreases due to increased ductility. Following Potentiodynamic tests, the utilization of these coatings proved to be beneficial as they showed good protection against aqueous corrosion when tested in 0.5 M NaCl solution. Our newly developed coatings offer an incentive to recycling CR and open up a safe and sustainable route to the disposal of scrap tires.
Highlights
One of the greatest challenges in solid waste management is the safe disposal of scrap tires
We found that a good adhesion requires the crumb rubber (CR) concentration to be within 24%–50% of the total weight of the coating
A cross-sectional view shows the distribution of CR particles from the side, which is essential to the performance of the coating
Summary
One of the greatest challenges in solid waste management is the safe disposal of scrap tires. Batayneh et al [8] showed that CR-modified concrete is able to meet weight requirements without sacrificing workability They found that CR-modified concrete can absorb a large amount of energy under compressive and flexural loads, has excellent vibration isolation capability and remains intact after failure unlike conventional concrete [9,10,11]. For these reasons, CR-modified concrete is useful in the construction of lightweight walls, building facades and architectural units [11]. The enhanced features will increase the incentive to recycle scrap tires
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