YK-2001D corrosion and scale inhibitor is a low phosphorus corrosion and scale inhibitor. As a scale inhibitor, it is especially suitable for inhibiting the formation of calcium carbonate scale, calcium sulfate scale, barium sulfate scale and calcium phosphate scale. Phosphorus-free corrosion and scale inhibitors does not contain phosphorus. In the areas where strictly restrict emission of phosphorus of wastewater, the cost of sewage treatment can be greatly reduced. Since phosphorus is not contained, microbial growth in the circulating water system is reduced, result in reduce using Germicide and algicide as well as slime stripper.