A method for improving the performance of corrosion inhibitors in industrial cooling water systems

A cooling water system and corrosion inhibitor technology, which is applied in the field of improving the performance of corrosion inhibitors in industrial cooling water systems, and can solve problems such as high cost of chemicals and environmental pollution

Inactive Publication Date: 2016-03-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of corrosion inhibitors can better control the corrosion of metals during the operation of the circulating cooling water system, but the use of chemical agents is expensive on the one hand and pollutes the environment on the other hand

Method used

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  • A method for improving the performance of corrosion inhibitors in industrial cooling water systems

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In simulated water containing 0, 0.5, 1, 2, 3, 5mg / L benzotriazole respectively, the corrosion current density of brass was tested to be 0.82, 0.49, 0.17, 0.12, 0.16 and 0.18μA / cm 2 , Under this condition, the corrosion inhibition rates of benzotriazole with concentrations of 0.5, 1, 2, 3, and 5 mg / L on brass were calculated to be 40.2%, 79.3%, 85.4%, 80.5% and 78.0%, respectively.

Embodiment 2

[0028] In blank simulated water, the corrosion current density of brass is 0.82μA / cm 2 . After the simulated water was treated with frequency conversion DC pulse electromagnetic water processor for 0.5h and 1h respectively, the corrosion current density of brass was tested to be 0.84μA / cm 2 . The results show that pure electromagnetic treatment has no corrosion inhibition performance on brass;

[0029] The frequency conversion DC pulse electromagnetic water processor has a power supply of AC 220V, 50Hz, a working voltage of DC 10-15V, an output power of 100-300W, a frequency conversion range of 20Hz~75KHz, and a carrier frequency of 1MHz.

Embodiment 3

[0031] The simulated water containing 0, 0.5, 1, 1.5, 2, 3, and 5mg / L benzotriazole respectively, after being treated by a frequency conversion DC pulse electromagnetic water processor for 0.5h, the corrosion current density of brass was detected to be 0.84 , 0.27, 0.13, 0.11, 0.084, 0.12 and 0.095μA / cm 2 , the corrosion inhibition rates of benzotriazole with concentrations of 0.5, 1, 2, 3, and 5 mg / L on brass under this condition were calculated to be 67.9%, 84.5%, 86.9%, 90.0%, 85.7% and 88.7%, respectively. %;

[0032] The frequency conversion DC pulse electromagnetic water processor has a power supply of AC 220V, 50Hz, a working voltage of DC 10-15V, an output power of 100-300W, a frequency conversion range of 20Hz~75KHz, and a carrier frequency of 1MHz.

[0033] Compare by above-mentioned embodiment 1, embodiment 2 and embodiment 3, the result shows:

[0034] In the case of purely using benzotriazole without electromagnetic treatment, when the concentration of benzotria...

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Abstract

The invention discloses a method for improving the performance of a corrosion inhibitor in an industrial cooling water system, which adopts an electromagnetic water processor, and installs the working induction coil of the electromagnetic water processor on the heat exchanger equipment in the industrial cooling water system. At the nozzle, under the action of the electromagnetic field, the corrosion inhibitor in the industrial cooling water system shows better corrosion inhibition performance, that is, the electromagnetic field generated by the application of the electromagnetic water processor makes the corrosion inhibitor produce a synergistic effect, which can not only protect the heat Exchanging the surface metal has a better protective effect, and can also reduce the use of corrosion inhibitors, thereby achieving the purpose of saving costs and reducing chemical emissions.

Description

technical field [0001] The invention relates to a method for improving the performance of a corrosion inhibitor in an industrial cooling water system, belonging to the technical field of metal corrosion and protection. Background technique [0002] Scaling, corrosion, and microbial growth often occur in industrial circulating cooling water systems during operation, especially after the concentration ratio increases. These problems are particularly prominent. At present, the method of adding water treatment chemicals is usually used to control them. Corrosion inhibitors are an important part of water treatment chemicals in circulating cooling water systems. Usually, the corrosion inhibitors for copper alloys are adsorption-type corrosion inhibitors such as benzotriazole (BTA) and 2-mercaptobenzothiazole (MBT). The use concentrations are 2-3mg / L and 3-5mg / L respectively. Corrosion inhibitors for ferrous metals are passivating corrosion inhibitors such as molybdates and tungst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14C23F11/16C23F11/18C23F11/06
Inventor 葛红花金志浩韩建勋林薇薇张敏王学娟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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