A composite non-phosphorus corrosion and scale inhibitor

Abstract

The invention discloses composite type phosphorous-free corrosion and scale inhibitor.The composite type phosphorous-free corrosion and scale inhibitor is composed of, by weight, 20-30 parts of S-carboxyalkylthiosuccinic acid (CETSA), 10-15 parts of sodium gluconate, 5-8 parts of sodium benzoate, 10-20 parts of hydroxy-propyl acrylate (HPA), 5-10 parts of zinc sulfate and 35-45 parts of water.CETSA is good in water solubility and biodegradability and has good corrosion and scale inhibition performance within a wide pH range, and particularly after CETSA is compounded with sodium gluconate, hydroxy-propyl acrylate (HPA), Zn salt and the like, the corrosion inhibiting rate is remarkably raised.Under the conditions that the temperature is 45 DEG C and the mass fraction is 20 micrograms / g, the corrosion inhibiting rate of the composite type phosphorous-free corrosion and scale inhibitor can reach 93.2%, and the scale inhibiting rate reaches 98.5%.

Description

technical field [0001] The invention relates to the technical field of environment-friendly corrosion and scale inhibitors, in particular to a composite non-phosphorus corrosion and scale inhibitor. Background technique [0002] With the rapid development of electric power and steel industry, the consumption of circulating cooling water is increasing. In order to prevent pipeline corrosion and scaling caused by circulating cooling water, it is usually necessary to add a certain amount of scale and corrosion inhibitors to the circulating cooling water. However, traditional scale and corrosion inhibitors contain phosphates and other substances. Discharge into the environment will cause eutrophication of the water body and seriously pollute the water environment. Therefore, the development of a new type of phosphorus-free scale and corrosion inhibitor has become a major issue to be solved in the field of environmental protection and water treatment agents. The use of circulati...

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Problems solved by technology

At present, organic phosphate copolymers are the most widely used corrosion and scale inhibitors at home and abroad, but the discharge of phosphorus in this type of corrosion and scale inhibitors will lead to eutrophication of water sources and red tides, which will have a very serious impact on the ecological environment. big impact