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A compound pickling corrosion inhibitor of stevioside and zinc acetate

A technology of stevioside and zinc acetate, which is applied in the fields of natural source plant-type corrosion inhibitors and compound applications with Zn2+, and can solve problems such as poor water solubility, complicated process, and secondary pollution

Active Publication Date: 2022-02-22
威海惠安康生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the above-mentioned deficiencies that exist in the prior art, the object of the present invention is to provide a kind of natural source stevia plant type corrosion inhibitor and its combination with Zn 2+ The combination of existing corrosion inhibitors solves the problems of high toxicity, refractory degradation, poor water solubility, high cost, complicated process, and easy to cause secondary pollution to the environment.

Method used

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  • A compound pickling corrosion inhibitor of stevioside and zinc acetate
  • A compound pickling corrosion inhibitor of stevioside and zinc acetate
  • A compound pickling corrosion inhibitor of stevioside and zinc acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Use a 1 mol / L hydrochloric acid solution to prepare a test solution with a molar ratio of stevioside and zinc acetate of 3:1, 2:1, 1:1, 1:2, and 1:3, of which stevioside is 1:1. and zinc acetate are both 1 mmol / L.

[0024] (2) At room temperature, the epoxy resin is encapsulated and the exposed area at one end is 0.5 cm 2 A C1020 carbon steel rod was used as the working electrode, a saturated calomel electrode was used as the reference electrode, and a platinum sheet electrode with a size of 1.0 cm × 1.0 cm was used as the auxiliary electrode. The C1020 carbon steel working electrode was measured by a traditional three-electrode system using CHI760e electrochemical workstation Tafel polarization curves and AC impedances of different amounts of stevioside and zinc acetate added to hydrochloric acid solution.

[0025] figure 2 It is the Nyquist impedance spectrum of the C1020 carbon steel working electrode obtained in Example 1 with different amounts of stevioside...

Embodiment 2

[0028] (1) Use 1 mol / L hydrochloric acid solution to prepare 1 mmol / L stevioside and 2 mmol / L zinc acetate solution to be tested.

[0029] (2) Under the condition of 25 °C, the C1020 carbon steel sheet was fixed on the mounter, completely immersed in the experimental solution, and rotated at 75 rpm for 24 h, and the weight of the test piece before and after the experiment was recorded. According to the formula: v = (w 1 −w 2 ) / (s×t) to calculate the corrosion efficiency, where w 1 and w 2 (mg) is the weight loss of the sample before and after soaking, s (cm -2 ) is the area of ​​the steel sample, t(h) is the soaking time; n w = (v 0 −v) / v 0 Calculate the corrosion inhibition efficiency, where v and v 0 Corrosion rates without inhibitor and with inhibitor, respectively.

[0030] The corrosion inhibition efficiency of the compound corrosion inhibitor of the above example 2 is as follows:

[0031] Table 1 Example 2

[0032]

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PUM

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Abstract

The invention relates to the field of pickling and descaling of circulating cooling water, in particular to a plant-type corrosion inhibitor of natural origin and Zn 2+ compound application. The corrosion inhibitor stevioside is a plant extract from natural sources, and is a non-toxic and harmless green corrosion inhibitor. Compared with the current chemically synthesized corrosion inhibitors, it can decompose rapidly in nature, has no environmental problems after use, is non-toxic and harmless to the environment and organisms, and conforms to the development trend of pickling corrosion inhibitors. The combination of stevioside and zinc ions significantly improved the uniformity and corrosion resistance of the protective film, and showed a synergistic inhibitory effect. Compared with the currently commonly used corrosion inhibitors, it has the advantages of low dosage, high efficiency, and strong continuous action ability. Advantages, can be used repeatedly, and has broad market application prospects.

Description

technical field [0001] The invention relates to the field of acid washing and descaling with circulating cooling water, in particular to a natural source plant type corrosion inhibitor and its compound application with Zn2+. Background technique [0002] High-strength, readily available, low-cost C1020 carbon steel is the most important target used more often than other steels in MSF desalination plant production (Dehdab, M., et al . Desalination 2016, 400 , 7; Alamri, A., et al . Desalination 2019, 470 , 114100). However, the continuous evaporation and concentration of water will lead to the deterioration of circulating water quality, inorganic scaling on the surface of CCS, reduce the heat transfer capacity of the equipment, and even lead to accidents such as boiler explosion, so it needs to be removed regularly. [0003] An effective descaling technique is cleaning with hydrochloric acid or sulfuric acid. Unfortunately, these acids cause severe corrosion to ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/06C23G1/08
Inventor 李惠静张维维陈立伟吴彦超
Owner 威海惠安康生物科技有限公司
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