Abstract
We evaluated the applicability of metal spray coating as a waterproofing/corrosion protection method for a concrete structure used for water purification. We carried out an ozone resistance test on four metal sprays and evaluated the water permeability and bond strength of the metals with superior ozone resistance, depending on the surface treatment method. In the ozone resistance test, four metal sprays and an existing ozone-proof paint were considered. In the experiment on the water permeability and bond strength depending on the surface treatment method, the methods of no treatment, surface polishing, and two types of pore sealing agents were considered. The results showed that the sprayed titanium had the best ozone resistance. Applying a pore sealing agent provided the best adhesion performance, of about 3.2 MPa. Applying a pore sealing agent also provided the best waterproofing performance. Scanning electron microscope analysis showed that applying a pore sealing agent resulted in an excellent waterproofing performance because a coating film formed on top of the metal spray coating. Thus, when using a metal spray as waterproofing/corrosion protection for a water treatment concrete structure, applying a pore sealing agent on top of a film formed by spraying titanium was concluded to be the most appropriate method.
Highlights
At present, water is purified by using chlorine
Chlorine input processes in the mixing tank, coagulation tank, sedimentation tank, and filtering tank remove harmful materials (e.g., Pb, As, Sn, and Cd) from the water supply and acidic materials from the wastewater, which are otherwise harmful to living things [1,2]
Organic materials react with ozone directly or with the hydroxyl radical (OH− ) generated by ozone decomposition, which changes their properties
Summary
Water is purified by using chlorine. Chlorine input processes in the mixing tank, coagulation tank, sedimentation tank, and filtering tank remove harmful materials (e.g., Pb, As, Sn, and Cd) from the water supply and acidic materials from the wastewater, which are otherwise harmful to living things [1,2]. Organic materials react with ozone directly or with the hydroxyl radical (OH− ) generated by ozone decomposition, which changes their properties. This is called oxidation [3,4,5,6,7,8,9]. The oxidation of ozone and strong oxidizing power of harmful acids in wastewater affect the quality of the concrete of the water treatment structure This can become a cause of deterioration, resulting in the waterproofing/anti-corrosion material of the concrete structure breaking away and causing the concrete to crack [1,2,11,12,13,14].
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