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Silicon-tungsten corrosion inhibitor for circulation cooling system of demineralized water

A cooling system and brine circulation technology, applied in the field of silicon tungsten corrosion inhibitors, can solve problems such as danger, pitting corrosion caused by insufficient metering, and high water quality requirements

Active Publication Date: 2009-10-07
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicate corrosion inhibitors are non-toxic and non-polluting, but they have high requirements on water quality, pitting corrosion is likely to occur if the dosage is insufficient, and silicate scale will be formed if the control is not good, so it is seldom used
For example, the silicon corrosion inhibitor of Betz Company in the United States has a formula of 10 ppm sodium silicate, 10 ppm hydroxyethylidene diphosphate, 20 ppm carboxymethyl cellulose, and 3 ppm benzotriazole. This corrosion inhibitor is only suitable for industrial water circulation cooling systems. , can not be used in desalinated water circulation cooling system
In 1995, Shougang Corporation applied for the patent "Silicon Corrosion Inhibitor for Soft Water Closed Circulation Cooling System" (ZL 95117456.8), the proportion of which is sodium silicate (based on SiO 2 Total) 500-1000ppm, multi-component copolymerized sodium polyacrylate 5-10ppm, hydroxyethylidene diphosphate 5-10ppm, benzotriazole 1-2ppm, the concentration of this corrosion inhibitor is relatively high, and it is suitable for soft water closed circulation cooling system , for open desalinated water systems, there is a risk of silica scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The corrosion inhibitor is composed of sodium silicate, sodium tungstate, triethanolamine, and benzotriazole, and its weight ratio is 82.6% of sodium silicate, 8.3% of sodium tungstate, 8.3% of triethanolamine, and benzotriazole 0.83%.

Embodiment 2

[0012] The corrosion inhibitor is composed of sodium silicate, sodium tungstate, triethanolamine and benzotriazole, and its weight ratio is 88.3% sodium silicate, 5.84% sodium tungstate, 5.84% triethanolamine, and benzotriazole 0.58%.

Embodiment 3

[0014] The corrosion inhibitor is composed of sodium silicate, sodium tungstate, triethanolamine, and benzotriazole, and its weight ratio is 71% of sodium silicate, 14.2% of sodium tungstate, 14.2% of triethanolamine, and benzotriazole 0.71%.

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PUM

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Abstract

The invention relates to a silicotungsten corrosion inhibitor used in a desalinated water circulating cooling system. Its chemical composition is composed of silicate, tungstate, triethanolamine and copper corrosion inhibitor. The weight ratio is: silicate 70 -90%, tungstate 2.5-27%, triethanolamine 2.5-18%, copper corrosion inhibitor 0.5-1.5%. The corrosion inhibitor of the invention is suitable for the corrosion inhibition treatment of the desalinated water circulating cooling system, and has the characteristics of high efficiency, low dosage, non-toxicity and no pollution.

Description

technical field [0001] The invention relates to a silicon tungsten corrosion inhibitor used in a circulating cooling water system, and is particularly suitable for corrosion inhibition treatment of a desalinated water circulating cooling system. Background technique [0002] In industrial production, a large number of processes need to be cooled with water. With the continuous development of social urbanization and industrial production, water resources are becoming more and more tense. In order to save water, the concentration ratio of the industrial circulating water cooling system has been continuously increased, reaching more than 4 times. Due to the increase in the concentration ratio, the calcium and magnesium ions in the water continue to increase, resulting in serious fouling of the circulating water cooling system. To solve this problem, demineralized water circulation cooling system is increasingly used. However, in the circulating cooling system using desalinat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/08
Inventor 李增朴范丽娜
Owner SHOUGANG CORPORATION