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Test method for simulating iron bacterial corrosion in water environment

A test method and iron bacteria technology, applied in the field of corrosion, can solve the problems of inability to simulate corrosion products and metabolites, and do not consider the influence of microbial film marine environmental factors, and achieve the effect of facilitating in-situ observation

Pending Publication Date: 2021-12-17
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot simulate the influence of corrosion products and metabolites, and does not consider the influence of marine environmental factors outside the microbial film.

Method used

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  • Test method for simulating iron bacterial corrosion in water environment

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preparation example Construction

[0026] The preparation method of pure SA solution is to add SA into deionized water at 60°C, stir to dissolve it, and let it stand to remove air bubbles before use. Composite SA solution consists of Fe(OH) 3 The powder is prepared by blending with SA solution. The preparation method of composite SA solution is: Fe(OH) 3 Add the powder into the SA solution, disperse it with a high-speed dispersing homogenizer for 15 minutes, and treat it in an ultrasonic cleaner for 5 minutes as a treatment cycle, with a total of 6 cycles.

[0027]The preparation method of the simulated microbial film is as follows: apply a 200 μm thick composite SA solution film on the surface of the sample with a wire bar coater or a film applicator conforming to the national standard GB / T 1727, and spray a gel agent on the surface of the liquid film to make the composite SA solution Membrane gel, according to the research needs, the same method can be used to prepare several layers of composite SA gel memb...

Embodiment 1

[0029] Evaluation of IOB corrosion resistance of steel materials based on weight loss method

[0030] The concentration of SA solution is 3wt%. Fe(OH) in composite SA solution 3 The amount of addition is 0.5mol / L; when the simulated microbial film is prepared, the CaCl in the gel 2 The concentration is 8 wt%. Three layers of composite sodium alginate gel films were prepared on the steel substrate, and five layers of pure sodium alginate gel films were prepared on the surface of the composite sodium alginate gel films.

[0031] The test solution is a 3.5wt% NaCl aqueous solution, in which ferric chloride and H 2 o 2 , Fe 3+ Concentration is 0.2mol / L, H 2 o 2 The concentration is 0.05mmol / L; the simulated seawater velocity is 5m / s, and the temperature is 25°C.

[0032] After the sample is soaked in the test solution, the Fe in the test solution 3+ and H 2 o 2 decomposed O 2 The pure SA gel film and the composite SA gel film diffuse to the steel substrate and particip...

Embodiment 2

[0035] Electrochemical Study on IOB Corrosion Process of Iron and Steel Materials

[0036] The concentration of SA solution is 3wt%. Fe(OH) in composite SA solution 3 The added amount is 0.3mol / L. When simulating microbial film preparation, the CaCl in the gel 2 The concentration is 6 wt%. Two layers of composite sodium alginate gel films were prepared on the steel substrate, and three layers of pure sodium alginate gel films were prepared on the surface of the composite sodium alginate gel films.

[0037] The test solution is deionized water to which ferric sulfate and H 2 o 2 , Fe 3+ Concentration is 0.1mol / L, H 2 o 2 The concentration is 0.4mmol / L. The sample was used as the working electrode, and the test solution was used as the electrolyte, and the electrochemical impedance test was performed using an electrochemical workstation. The test temperature is 25°C and the scan range is 10 -2 -10 5 Hz, the amplitude of the sine wave potential is 20mV.

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Abstract

A test method for simulating iron bacterial corrosion in a water environment comprises the following steps: 1) preparing a simulated microbial film by using a natural polymer material as a film forming matter, wherein the simulated microbial film is divided into two layers, and one layer is a composite polymer film and contains a corrosion product simulant, and is coated on the surface of a steel substrate; the other layer is a pure polymeric film which does not contain a compound and is coated on the surface of the composite polymeric film; and the simulated microbial film prevents corrosion product simulants from escaping into a water environment, and meanwhile, the porosity of the simulated microbial film ensures the transmission of oxygen in the film; and 2) placing the sample coated with the simulated microbial film in a test solution containing soluble ferric salt and H2O2, and diffusing Fe < 3 + > and H2O2 to the steel substrate through the pure polymeric film and the composite polymeric film to form an oxidizing environment to promote the corrosion process of the steel substrate. According to the method, various corrosion factors in the corrosion process of iron bacteria (IOB) can be accurately controlled, and a tedious and time-consuming microorganism culture process is not needed.

Description

technical field [0001] The invention relates to the field of corrosion, in particular to a test method for laboratory simulation of iron bacteria corrosion process in water environment. Background technique [0002] Microbiologically induced corrosion (MIC) is a corrosion process that occurs with the participation of microbial life activities. This process widely exists in the fields of petroleum industry, marine equipment, fluid transportation and water treatment, and the corrosion failure caused by it is increasingly recognized. Emphasis in the field of engineering and research. Because the factors affecting the microbial corrosion process in the actual environment are complex and changeable, and it is difficult to control and describe quantitatively, it is of great significance to use the experimental method of simulating the biological environment to evaluate the role of biological factors in the seawater corrosion of materials and reveal the law of biological corrosion....

Claims

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Application Information

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IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 高鹏陈义庆钟彬李琳艾芳芳伞宏宇苏显栋沙楷智田秀梅
Owner ANGANG STEEL CO LTD
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