Long effective environmental protection type corrosion inhibitor for inclosed recirculated cooling water

Abstract

This invention discloses an environmentally friendly long-effective corrosion inhibitor for sealed circulation cooling water system, which is composed of: molybdate or tungstate 10-20 wt.%, a mixture of C4-12 monocarboxylic acid and polycarboxylic acid 60-70 wt.%, complexing organic carboxylate 0-3 wt.%, polymer 0.05-3 wt.%, benzotriazola 0.005-1 wt.%, Zn salt 0.005-1 wt.%, and NaOH 10-15 wt.%. The corrosion inhibitor does not contain nitrate, nitrite, chromate, inorganic and organic phosphate, borate and silicate, thus is environmentally friendly. Besides, the corrosion inhibitor has such advantages as low dosage, high profit, and long and good effect on heat-conductive metals such as normal carbon steel, red copper and brass.

Description

Technical field [0001] The invention relates to a long-acting and environmentally-friendly corrosion inhibitor for closed circulating cooling water. Background technique [0002] The metallurgical industry uses a large number of high-temperature equipment, such as blast furnaces, steelmaking furnaces, crystallizers, etc. At present, most of them use closed soft water circulation cooling. Due to long-term contact with soft water under high temperature conditions, the pipes of the cooling system leak due to corrosion, so it is necessary With the addition of anti-corrosion inhibitors, the anti-corrosion requirements in the soft water cooling system are the most important. [0003] At present, the majority of domestic enterprises still use inorganic phosphates and organic phosphates as the main corrosion inhibitors, some use borate, silicate, and even nitrates and nitrites. And chromate. Nitrate, nitrite and chromate products are highly toxic to the human body and have strong cancer-...

AI Technical Summary

Problems solved by technology

Inorganic phosphates and organic phosphonates have higher corrosion inhibition performance and are cheaper in price, but the discharge of phosphorus will cause eutrophication in local waters and cause great pollution to the environment. Foreign developed countries such as the United States, the European Union, Japan, etc. Start restricting the use of such products