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

A technology of closed circulation and corrosion inhibitor, which is applied in the direction of descaling and water softening, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of water eutrophication and environmental pollution, and achieve less usage , good economic performance, and long-lasting effect

Inactive Publication Date: 2007-02-21
WUHAN IRON & STEEL (GROUP) CORP
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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

Method used

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Embodiment Construction

[0008] The long-acting environmental protection type blast furnace closed circulating cooling water corrosion inhibitor provided by the present invention, in terms of mass percentage, its components include: molybdate or tungstate 10-20, mono- and poly-organic organic compounds containing 4-12 carbon atoms Carboxylic acid mixture 60-70, organic carboxylate with complexation 0-3, organic polymer 0.05-3, benzotriazole 0.005-1, zinc salt 0.005-1, sodium hydroxide 10-15.

[0009] The corrosion inhibitor of the present invention is made by the following method:

[0010] First compound tungstate or molybdate with monobasic and polybasic organic carboxylic acid containing 4-12 carbon atoms, then mix with organic carboxylate and organic polymer with complexation, and then add benzotriazole, Zinc salt and sodium hydroxide are fine.

[0011] For the above tungstate, one or more of sodium tungstate, ammonium tungstate and potassium tungstate can be selected.

[0012] The above-mentioned mono...

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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-...

Claims

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Application Information

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IPC IPC(8): C02F5/00
CPCC23F11/08
Inventor 陈勇刘建容张万灵
Owner WUHAN IRON & STEEL (GROUP) CORP
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