Ozone Resistance, Water Permeability, and Concrete Adhesion of Metallic Films Sprayed on a Concrete Structure for Advanced Water Purification

Abstract

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.

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

“…The Cu, Cu-Zn, and Cu-Ni coating was deposited onto the smooth steel substrate by the arc thermal spray process. In the arc thermal spray process, twin wires were melted at 30 V and 200 mA on arcing point and with the help of compressed air on 7.5 bars, the molten metal particles are propelled, resulting in deposition of coating by keeping the substrate away from the spray gun on 15–20 cm as described in our earlier publications [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. The deposition of Cu coating was carried out by twin wires of Cu while for Cu-Zn and Cu-Ni, one wire (wire-1) was Cu and another (wire-2) was Zn (Cu-Zn coating) and Ni (Cu-Ni coating) as described in Table 1 .…”

Electromagnetic Shielding Performance of Carbon Black Mixed Concrete with Zn–Al Metal Thermal Spray Coating

“…The arc thermal metal spraying method (ATMSM) was used to address the problem of metal plate in construction for existing shielding facilities owing to the cost effectiveness. In the arc thermal metal spraying method, a metal wire rod is coming out from the nozzle of a spray gun that blows compressed air, and is dispersed and cooled on the surface of the specimen to be coated [14,[28][29][30][31][32][33][34][35][36][37]. Subsequently, the specimen after spraying is allowed to quench, solidify, and laminate.…”

Influence of Different Metal Types on the Bonding Strength of Concrete Using the Arc Thermal Metal Spraying Method

“…Recently, metal-film finishing methods have been developed to apply arc thermal metal spraying (ATMS) to water treatment and electromagnetic wave shielding facilities [ 6 , 8 , 9 , 10 , 11 ]. These new finishing methods apply metal spraying, a conventional technology mainly used in high-durability anti-corrosion applications for steel structures [ 5 , 10 ].…”