This technology is a water treatment tank structure and finishing method that forms a thick first metal spray layer on the inner concrete wall using arc spraying, followed by a thin second metal spray layer using a mixture of metal powder and Teflon-based resin powder.
Water purification and sewage treatment plants are increasingly using ozone treatment, which is 5–6 times more powerful than chlorine, to remove tastes, odors, and organic matter. However, conventional paints or ozone-resistant coatings applied to tank walls are easily corroded and peeled off by ozone's strong oxidizing power, causing maintenance and hygiene issues. Alternatives like attaching stainless steel plates with anchors and grout are very expensive, and existing spray technologies have lacked methods to ensure adhesion between concrete and metal coatings.
This technology involves sandblasting the inner concrete wall, strengthening the surface with a silicate-based penetrant, and creating micro-textures with a roughening agent to enhance the mechanical adhesion of the metal spray. Finally, the surface is smoothed with a Teflon-based resin sealant. Spray metals can include stainless steel, zinc, aluminum, zinc-aluminum alloys, or bronze. Applicable to ozone contact tanks in advanced water treatment plants, sewage/wastewater treatment tanks, and concrete structures in corrosive environments like bridges, it provides an ozone-resistant metal finish that is much more affordable and easier to install than stainless steel plate lining.
This invention was developed with technical support from the Ministry of Environment for metal spray lining to improve the durability of concrete structures in water treatment facilities.
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