17. Analysis of Hydrophobic-Silver Nanoparticle Coating to Inhibit Cooling Water Corrosion in Cooling Systems

As cooling systems become an essential part of industrial plants, the utilization of corrosion-prone carbon steel turns extensively high as well. A cooling system is a collection of equipment responsible for cooling and releasing heat to the surroundings with regards to plant’s safety and productivity. The application of carbon steel for its economical factor has exposed the metal of low corrosion resistance to conditions that cause deterioration of materials as well as the performance of system. Therefore, realizing the action of protecting carbon steel can be impactful, the present study aims to (i) investigate the cooling water corrosion inhibition offered by hydrophobic-silver nanoparticle coating on carbon steel in cooling system setting and (ii) evaluate effects of pH on the rate of corrosion in the cooling system. The analyses comprise of Tafel analysis and scanning electron microscopy (SEM) exhibited successful improvement of corrosion resistance on coated carbon steel exposed to environments with varied pH for 24 h, whereas acidic setting and high chloride content had rapidly increased the carbon steel’s corrosion rate after 7 days. Nonetheless, the integration of 3-aminopropyltriethoxysilane (APTES) with silver nanoparticles is a promising future to the retardation of cooling water corrosion.