New and Green Multi-component Scaling and Corrosion Inhibitor for the Cooling Water of Central Air Conditioners
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JMEPEG DOI: 10.1007/s11665-016-2474-9
New and Green Multi-component Scaling and Corrosion Inhibitor for the Cooling Water of Central Air Conditioners Maodong Li, Chenlin Dai, Bo Yang, Yue Qiao, and Zhiping Zhu (Submitted December 25, 2015; in revised form August 10, 2016) A green multi-component inhibitor was developed in this study to obtain suitable scale and corrosion inhibitor for the cooling water treatment of central air conditioners. The inhibitor formulation consisted of hydrolyzed polymaleic anhydride/Tween-80/sodium N-lauroyl sarcosinate/tolyltriazole (named 4-HTSA). Weight loss test and electrochemical method were used to investigate the corrosion inhibition performance of 4-HTSA on A3 carbon steel and T2 red copper in synthetic cooling water, and the scale inhibition performance of 4-HTSA was studied by the calcium carbonate precipitation method. The influence of parameters, such as pH, temperature, scaling and corrosive ion, on 4-HTSA was researched. Scanning electron microscopy (SEM) and x-ray diffraction were used for examination of the scale, and corrosion coupons were analyzed by SEM/energy-dispersive x-ray spectroscopy. Results showed that 4-HTSA had excellent scale and corrosion inhibition performance and wide tolerance to pH, temperature and the concentration of scaling and corrosive ion. Polarization curves indicated that 4-HTSA was anodic inhibitor. Keywords
central air conditioners, environmentally friendly, multi-component inhibitor, scale and corrosion inhibition efficiency
1. Introduction The cooling water of central air conditioner is roughly similar to the industrial circulating cooling water, and the existing water treatment method almost refers to the treatment of industrial circulating cooling water, which are mainly by adding chemicals (scaling inhibitor, corrosion inhibitor, bactericide) into circulating cooling water to inhibit scale formation and corrosion (Ref 1). The ratio of the amount of feed water to the amount of circulating water in central air conditioner cooling water system is very small, compared with that in industrial cooling water system, which as a result the running water will deteriorate in a short time. Therefore, inhibitor added in the cooling water is required to have good adaptability to running water. The equipment of cooling water system of central air conditioners is mostly made from carbon steel, red copper and a small amount of stainless steel. Among them, copper equipment accounts for a larger proportion than that in industrial cooling water system; thus, it is particularly important to inhibit copper-iron corrosion of the cooling water system. In conclusion, inhibitor added in the cooling water of central air conditioners must be able to inhibit scale formation and copperiron corrosion at the same time.
Maodong Li and Bo Yang, Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou, Guangdong, China; and Chenlin Dai, Yue Qiao, and Zhiping Zhu, School of Chemical and Biological Engineering, Changsha University of Science and T
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