Anticorrosive agent and anticorrosive method

An anti-corrosion agent and anti-corrosion technology, which is applied in the field of anti-corrosion agents and anti-corrosion, can solve problems such as corrosion, and achieve the effect of preventing corrosion and improving operability

Inactive Publication Date: 2008-04-02
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that depending on the conditions of the target water system, even this may cause pitting corrosion

Method used

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  • Anticorrosive agent and anticorrosive method
  • Anticorrosive agent and anticorrosive method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0038] Hereinafter, examples and comparative examples of the present invention will be described.

[0039] Fig. 1 shows a test device for evaluation.

[0040] In Fig. 1, a cooling tower 1 having a tank 1a at the bottom is installed, and the test water flows from the tank to the hood-side water-passing heat exchanger 2 provided with the evaluation tube and the in-pipe water-passing heat exchanger provided with the evaluation tube. water. The test water passed through each heat exchanger is returned to the cooling tower 1, and recycled after cooling. Make-up water is added to the evaporated part. In each heat exchanger, steam is supplied as a heat source. In addition, the water treatment chemicals used in the examples and comparative examples were supplied from the water treatment chemical tank 4 to the tank 1a.

[0041] In this test device, the flow rate of water passing through the pipe side is set to 0.3m / s, steam heating is implemented, and the temperature difference bet...

Embodiment 2 and comparative example 2

[0048] A rotating disk corrosion test in a 1 L beaker was carried out. The test water was implemented based on city water in the oak area, and the water temperature was 50° C., the stirring speed: 150 rpm, and the test was carried out for 1 week. The pre-weight of the SPCC used for the test was measured in advance, and the corrosion rate was calculated from the difference from the weight after the test. The medicine that is used for test is identical with above-mentioned embodiment 1) phosphorus-zinc series medicine, 2) non-phosphorus non-metal treatment medicine, 3) anti-pitting corrosion agent of the present invention, and the addition of each medicine is also identical with above-mentioned embodiment.

[0049] The results are shown in Figure 3.

[0050] As can be seen from Fig. 3, even in the rotating disc corrosion test, compared with the non-phosphorus non-metallic treatment chemical treatment, the anti-corrosion of the present invention, especially the anti-corrosion ef...

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PUM

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Abstract

The present invention provides an anticorrosive agent which has excellent corrosion prevention especially pit corrosion prevention effect in the non-phosphor and non-metal system, and a corrosion inhibition method by using the anticorrosive agent. The anticorrosive agent includes silicic acid or the salt of the silicic acid and the sulphonic acid system polymer, and includes alkali under the condition of liquefaction. The sulphonic acid system polymer can be at least one of the propenoic acid and 2-acrylamide-2-cymene propanesulfonic acid system copolymer, propenoic acid and isoprene sulphonic acid and 3-allyloxy-2-hydroxy-group propanesulfonic acid system terpolymer, propenoic acid and 2-acrylamide -2-cymene propanesulfonic acid and tert-butyl group acrylamide system terpolymer. In addition, the present invention prevents the corrosion especially the pit corrosion of the object water system by adding effective amount of the anticorrosive agent.

Description

technical field [0001] The invention relates to an anticorrosion agent and an anticorrosion method. More specifically, the present invention relates to an anticorrosion agent and an anticorrosion method for preventing corrosion, particularly pitting corrosion, on metals in contact with water in boiler water systems, cooling water systems, warm water systems, dust collection water systems, and the like. Background technique [0002] Conventionally, it has been known that corrosion including localized pitting corrosion occurs on metals in contact with water in boiler water systems, cooling water systems, warm water systems, dust collection water systems, and the like. In order to prevent such corrosion, polymeric phosphates, carboxylic acid-based polymers, and the like are used. However, polymeric phosphate is easily hydrolyzed to become orthophosphate, and in a water system with high pH, ​​calcium hardness, and water temperature, it precipitates as calcium phosphate, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
Inventor 藤田和久
Owner KURITA WATER INDUSTRIES LTD
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