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Novel corrosion inhibitor for inhibiting corrosion of steel in tap water or seawater and use method thereof

A technology of tap water and corrosion inhibitor, which is applied in the chemical field, can solve the problems of sodium molybdate, such as high price, limited use range, and low corrosion inhibition rate, and achieve good scale inhibition function, wide use concentration range, and environmental protection effects

Inactive Publication Date: 2012-01-11
郭良生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former is used in tap water medium, and the latter is used in seawater medium. Their common problem is that the range of application is limited; the former requires a large dose and high cost; the latter has a low inhibitory concentration of corrosion inhibitor, but sodium molybdate is expensive , the cost is high, and the corrosion inhibition rate is low, which needs to be greatly improved

Method used

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  • Novel corrosion inhibitor for inhibiting corrosion of steel in tap water or seawater and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 and Example 2: The test solutions are tap water without corrosion inhibitor and tap water with FX corrosion inhibitor 100ppm or 250ppm. FX corrosion inhibitor is composed of 25% triethanolamine phosphate, 25% zinc dihydrogen phosphate, 25% sodium tripolyphosphate and 25% hexamethylenetetramine. The test material is A 3 Steel, size 5×2.5×0.2cm, surface area 28cm 2 , All the samples used were polished step by step with metallographic sandpaper, then washed with tap water and absolute alcohol, dried with cold wind, and placed in a desiccator for 24 hours for later use.

[0022] The experiment adopts the weight loss method. After the sample is weighed, it is immersed in the test solution for 720 hours. The sample taken out is treated according to the method of GB 6384-86, weighed, and the corrosion rate υ of the steel sample is calculated according to the following formula, namely

[0023] υ(mm / y)=8.76×10 4 ×△W / S×t×p

[0024] In the formula: △W is the weight l...

Embodiment 3 or Embodiment 4

[0030] Embodiment 3 or embodiment 4: method is the same as above, and experimental medium is the natural seawater of Xiamen port, and when the concentration of FX corrosion inhibitor (component proportioning is above example) is 100ppm or 250ppm, to A 3 The corrosion inhibition rate of steel is close to 100%. The steel sample is bright without macroscopic corrosion.

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Abstract

The invention discloses a corrosion inhibitor for inhibiting the corrosion of steel in tap water or seawater, which consists of phosphoric acid triethanolamine, zinc dihydric phosphate, sodium tripolyphosphate and hexamethylene tetramine. When the using concentration of the corrosion inhibitor is 75ppm-250ppm, multiple protective films not only can be formed on the surface of the steel in the tap water or seawater, but also has self-repairing capability when being damaged, so that the corrosion inhibitor is especially effective in inhibiting the corrosion of the steel in the tap water or seawater, and the corrosion inhibiting rate is close to 100%. The corrosion inhibitor has small required dosage, cheap and easily-obtained raw materials, low cost, no toxicity, no pollution, good anti-scaling function, reduced blowdown, and good matching with oxidative bactericides, thus being an efficient water quality treating agent.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a formulation of a corrosion inhibitor (abbreviated as FX corrosion inhibitor) for inhibiting corrosion of steel in tap water or seawater and a method of use thereof. Background technique [0002] The chemical corrosion inhibitor method to inhibit the corrosion of steel in tap water or seawater is not only effective, but also relatively simple. For example, the product name PC-602 water quality stabilizer is essentially a phosphorus-based corrosion inhibitor with scale inhibition function ["Chinese Journal of Corrosion and Anticorrosion", 1988, 8(1): 61]. It is composed of polyol phosphate, polyol polyphosphate, polyphosphate and orthophosphate, when the concentration is 300ppm, the 3 The corrosion inhibition rate of steel is as high as 98% (weight loss method). As another example, the research report of Li Haiming and others pointed out that when the concentration of the composite cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/18C23F11/167
Inventor 郭良生
Owner 郭良生
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