YK-5001A corrosion and scale inhibitor is a composite water treatment agent with organic phosphonic acid as the main component, and belongs to organic phosphine scale inhibitor. The product has good thermal stability, is not easy to decompose and effect falling, and has good corrosion and scale inhibition effect on high hardness and high alkalinity. It is mainly used for corrosion and scale inhibitors in circulating water systems, such as power plants, chemical plants, steel, etc., with good corrosion inhibition and scale inhibition effects.