Corrosion inhibitor and its application

Abstract

The invention discloses a corrosion inhibitor, which comprises borate, alkali metal salt and/or alkali, rare earth element salt and polycarboxylate. The polycarboxylate is C6 or C7 organic carboxylate. The invention also discloses an application of the corrosion inhibitor in a closed circulating cooling water system for steelmaking as a metal corrosion inhibitor. The inventive corrosion inhibitor has good corrosion inhibition effect on common metal material, can be applied to metal corrosion inhibition of closed circulating cooling water systems, and is friendly to environment and human body.

Description

technical field [0001] The invention specifically relates to a corrosion inhibitor and its application. Background technique [0002] The steelmaking process in the iron and steel industry uses a large number of high-temperature equipment, such as LF furnaces, oxygen lances, sub-lances, crystallizers, continuous casting equipment, etc. At present, most of these equipment are cooled by closed soft water circulation. Due to the strong corrosion of soft water, the long-term In contact with soft water under high temperature conditions, it is prone to corrosion, which affects the heat transfer effect. Therefore, closed soft water systems generally need to add corrosion inhibitors to control system corrosion, and adjust the pH value to operate under alkaline conditions. [0003] At present, the corrosion inhibitor formulas used by many domestic enterprises mainly include: chromate formula, nitrite formula, silicate formula, molybdate formula and phosphorus formula. Although the ...

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Problems solved by technology

Some people have studied that rare earth cerium (IV) ions and sodium molybdate have obvious corrosion inhibition synergistic effect on cold-rolled steel in hydrochloric acid medium, and the maximum corrosion inhibition rate can reach about 90% [Mu Guannan, Li Xianghong, etc., rare earth cerium ions and The synergistic effect of sodium molybdate on cold-rolled steel corrosion inhibition in hydrochloric acid solution, Acta Chemie Sinica, 2004, 62(24): 2386-2390], Wang Wei applied rare earth elements to the open circulation cooling water treatment formula for the first time [ The application number is 200510026890 patent "Central Air Conditioning Cooling Water Composite Water Treatment Agent"], but the formula of rare earth elements used in closed circulation cooling water system has not been reported

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