Method for representing adsorption and desorption processes of corrosion inhibitor

A corrosion inhibitor, adsorption and desorption technology, applied in the field of characterization of the corrosion inhibitor adsorption and desorption process, can solve the problem that the quantitative analysis of the corrosion inhibitor has not yet been realized, and achieve the effect of improving the accuracy of the model

Pending Publication Date: 2021-11-12
UNIV OF SCI & TECH BEIJING
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, quantitative analysis of corrosion inhibitors on metal surfaces is still a great challenge
Enhanced Raman spectroscopy has been proven to be used to characterize the adsorption mode of corrosion inhibitors on metal surfaces, the arrangement and orientation of molecules, interfacial reactions, etc., but the quantitative analysis of the adsorption and desorption process of corrosion inhibitors has not yet been realized.

Method used

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  • Method for representing adsorption and desorption processes of corrosion inhibitor
  • Method for representing adsorption and desorption processes of corrosion inhibitor
  • Method for representing adsorption and desorption processes of corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Dissolving 8-hydroxyquinoline (8-HQ) molecules in 3.5 wt% NaCl solution, the concentration of 8-HQ is 0.1 g / L.

[0023] 2. Put 6 pieces of 1×1×0.3cm 3 The Q235 carbon steel samples were soaked in the above corrosion inhibitor solution for 3h, 15h, 30h, 45h, and 60h respectively. After soaking, the Q235 samples were taken out and dried.

[0024] 3. Deposit 10nm copper nanoparticles on the surface of the Q235 sample adsorbed with 8-HQ.

[0025] 4. Use a 785nm laser Raman spectrometer to detect the corrosion inhibitor signal on the surface of the sample.

[0026] figure 1 It is the enhanced Raman spectrum signal measured after the 8-HQ molecule is adsorbed on the surface of Q235 carbon steel in Example 1. As the immersion time increases, the Raman spectrum signal of the corrosion inhibitor gradually increases, indicating that the adsorption amount of the corrosion inhibitor on the carbon steel surface gradually increases, and reaches saturation at 60 h, thus obtainin...

Embodiment 2

[0028] 1. Different masses of 2-mercaptobenzothiazole (MBT) molecules were dissolved in 3.5wt% NaCl solution, and the concentrations of MBT were 0.1g / L, 0.2g / L, 0.3g / L, 0.4g / L respectively.

[0029] 2. Place 1×1×0.2cm 3 The AA2024-T3 aluminum alloy was soaked in the above-mentioned corrosion inhibitor solution for 2h-92h. After different soaking times, the aluminum alloy samples were taken out and dried.

[0030] 3. Depositing 10nm gold nanoparticles on the surface of the aluminum alloy sample adsorbed with MBT.

[0031] 4. Use a 532nm laser Raman spectrometer to detect the enhanced Raman spectrum signal of MBT molecules on the surface of the sample after soaking for different times, and obtain a saturated adsorption spectrum.

[0032] 5. Extract saturated adsorption Raman spectra of different concentrations of corrosion inhibitors, 5 pieces of spectral data for each concentration, group all spectral data, including training set and prediction set, the training set accounts f...

Embodiment 3

[0036] 1. Different masses of 2-mercaptobenzothiazole (MBT) molecules were dissolved in 3.5wt% NaCl solution, and the concentrations of MBT were 0.1g / L, 0.2g / L, 0.3g / L, 0.4g / L respectively.

[0037] 2. Place 1×1×0.2cm 3 The AA2024-T3 aluminum alloy was soaked in the above-mentioned corrosion inhibitor solution for 2h-92h. After different soaking times, the aluminum alloy samples were taken out and dried.

[0038] 3. Depositing 5nm silver nanoparticles on the surface of the aluminum alloy sample adsorbed with MBT.

[0039] 4. Use a 785nm laser Raman spectrometer to detect the enhanced Raman spectrum signal of MBT molecules on the surface of the sample after soaking for different times, and obtain a saturated adsorption spectrum.

[0040] 5. Extract saturated adsorption Raman spectra of different concentrations of corrosion inhibitors, 5 pieces of spectral data for each concentration, group all spectral data, including training set and prediction set, the training set accounts ...

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Abstract

The invention discloses a method for representing adsorption and desorption processes of a corrosion inhibitor. According to the method, the enhanced Raman spectrum technology and the least square regression method are combined, and the adsorption and desorption processes of the corrosion inhibitor are reflected by establishing a quantitative mathematical model of the concentration of the corrosion inhibitor and the Raman spectrum intensity. The method comprises the following steps: firstly, measuring an enhanced Raman spectrum of the corrosion inhibitor adsorbed on the surface of metal and alloy thereof to obtain saturated adsorption spectrum intensity; dividing the saturated adsorption Raman spectrums of the corrosion inhibitors with different concentrations into a training set and a prediction set, establishing a mathematical model of the corrosion inhibitor concentration and the spectral intensity by using a least square regression method, and improving the accuracy of the model by reasonably selecting a characteristic spectrum; and substituting the Raman spectrum of the corrosion inhibitor with unknown concentration into the model, and calculating the actual adsorption concentration of the corrosion inhibitor. The method can be used for representing the adsorption and desorption processes of the corrosion inhibitor along with time and concentration changes, facilitates the analysis of the adsorption kinetics law of the corrosion inhibitor, and is of great significance to clarification of the corrosion protection effect of the corrosion inhibitor.

Description

technical field [0001] The invention belongs to the field of corrosion and protection research, in particular to a method for characterizing the adsorption and desorption process of corrosion inhibitors. Background technique [0002] Material corrosion will cause serious safety hazards and economic losses in the actual use of industrial fields such as construction, transportation, and electrical equipment. Corrosion inhibitor is an effective anti-corrosion method, which has the advantages of high efficiency, low cost and wide adaptability. Only a small amount of corrosion inhibitor is added to adsorb on the metal surface and form a protective layer to prevent the intrusion of corrosive ions, oxidants and water, and significantly reduce the corrosion rate. The research methods of corrosion inhibition mechanism mainly include electrochemical test, surface analysis technology and simulation method. Electrochemical testing methods include electrochemical impedance spectroscopy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 马菱薇王亚杰王金科张达威李晓刚
Owner UNIV OF SCI & TECH BEIJING
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