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Application of triazole compounds in corrosion inhibitor for copper in seawater

A technology of triazoles and compounds is applied in the field of nitrogen-containing heterocyclic corrosion inhibitors, which can solve the problems of scarcity, poor activity and loss of performance of corrosion inhibitors, and achieve the effects of convenient purchase, low cost, and damage inhibition.

Inactive Publication Date: 2011-07-06
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, although copper ranks after hydrogen in the metal activity sequence table, and its activity is poor, copper is also extremely susceptible to corrosion damage to varying degrees in systems containing chloride ions, sulfates, nitrates and other corrosive media, thus Lose its original various performances, and even bring huge disasters
[0004] At present, although there have been many reports on seawater corrosion inhibitors for metallic copper, the number of corrosion inhibitors that can be used in actual production is extremely rare, and most of them still use traditional benzotriazole compounds as copper corrosion inhibitors. agent, which brings a series of economic and environmental problems to the production process

Method used

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  • Application of triazole compounds in corrosion inhibitor for copper in seawater

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Embodiment 1

[0019] Metal corrosion is an electrochemical process. Whether the corrosion is serious and whether the protection is adequate can be judged from the corrosion current and charge transfer resistance. The main methods of measuring electrochemical corrosion are electrochemical impedance spectroscopy and polarization curve method. Through AC impedance spectroscopy, the charge transfer resistance of copper can be obtained. The larger the charge transfer resistance, the denser the protective film of the corrosion inhibitor molecules on the copper surface, and the better the protection of copper. The reduction can be obtained by formula (1). Corrosion inhibitor efficiency of copper. On the other hand, by the polarization curve method, the corrosion current of copper can be obtained. The larger the corrosion current, the more serious the corrosion. Therefore, the corrosion current is used to obtain the corrosion inhibition efficiency of the corrosion inhibitor according to formula (2) t...

Embodiment 2

[0026] Experimental conditions: The experimental material is red copper (mass concentration 99.999%), triazole compounds are used as copper seawater corrosion inhibitors, and the copper seawater corrosion inhibitors are directly added to the medium, and the copper products are immersed in it. The immersion temperature is 25℃ , PH range is 7.5, immersion for 1 hour; triazole compound copper seawater corrosion inhibitor is: 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol is dissolved In cyclohexanone, and emulsifier OP-10 to make a microemulsion, the medium is 3.5% sodium chloride solution, the amount is 0.5L, the corrosion inhibitor is 4-amino-5-phenyl-4H-1,2, The effective content of 4-triazole-3-thiol is 0.01g.

[0027] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 78.1%, and potentiodynamic polarization 80.9%, showing that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0029] Experimental conditions: The experimental material is red copper (mass concentration 99.999%), triazole compounds are used as copper seawater corrosion inhibitors, and the copper seawater corrosion inhibitors are directly added to the medium, and the copper products are immersed in it. The immersion temperature is 25℃ , PH range is 7.5, immersion for 1 hour; triazole compound copper seawater corrosion inhibitor is: 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol is dissolved In cyclohexanone, and emulsifier OP-10 to make a microemulsion, the medium is 3.5% sodium chloride solution, the amount is 0.5L, the corrosion inhibitor is 4-amino-5-phenyl-4H-1,2, The effective content of 4-triazole-3-thiol is 0.015g.

[0030] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 82.9%, and potentiodynamic polarization 81.6%, showing that it is a corrosion inhibitor with low dosage and high efficiency.

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Abstract

The invention relates to a corrosion inhibitor for copper in seawater, namely a low-toxicity efficient nitrogen heterocyclic ring corrosion inhibitor and application thereof for inhibiting corrosion of metallic copper and products thereof in a seawater medium. Triazole compounds can be used as a corrosion inhibitor for copper in seawater to perform corrosion prevention for copper products in a seawater medium or a sodium chloride medium. The corrosion inhibitor provided by the invention has little consumption, low toxicity, high efficiency and strong sustained action, can effectively inhibit corrosion damage of metallic copper, and has wide application prospects.

Description

Technical field [0001] The invention relates to a seawater corrosion inhibitor for copper, that is, a low-toxic, high-efficiency nitrogen-containing heterocyclic corrosion inhibitor for inhibiting the corrosion of metallic copper and its products in seawater medium and its application. Background technique [0002] With the continuous consumption of various resources on land, the development and utilization of marine resources has become an inevitable way to solve the current depletion of resources. However, seawater is a strong electrolyte solution and is highly corrosive, which greatly limits the development and utilization of marine resources. Therefore, only by solving the corrosion problem of metal materials in seawater, can the development and utilization value of marine resources be truly reflected. [0003] Copper has excellent mechanical strength, workability, electrical conductivity, thermal conductivity, weldability and other characteristics, and has been widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/16
Inventor 李伟华曹琨白雪田惠文侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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