Corrosion and scale inhibitors are composed of organic phosphonates, copolymers, and copper corrosion inhibitors, exhibiting excellent corrosion inhibition performance for carbon steel, copper, and copper alloys, as well as superior scale inhibition and dispersion performance for calcium carbonate and calcium phosphate. This product is a water treatment chemical formulated by combining one or more individual agents, capable of simultaneously controlling corrosion and scale formation. It is primarily used in open recirculating cooling water systems and copper-containing equipment systems in industries such as power generation, metallurgy, oil refining, and chemical processing.