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Preparation method of corrosion-mitigating film on steel surface

A steel surface and anti-corrosion technology, applied in the field of metal anti-corrosion, can solve the problems of unsuitable sustainable development, large environmental pollution, high economic cost, etc., and achieve the effect of excellent anti-oxidation performance, firm adsorption, and low cost

Inactive Publication Date: 2019-06-14
CHUXIONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional steel surface anti-corrosion technologies, such as phosphating, passivation, electroplating, chemical plating and other surface processes, have gradually failed to meet the needs of sustainable development in today's society due to shortcomings such as high economic costs, complicated operations, and large environmental pollution.

Method used

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  • Preparation method of corrosion-mitigating film on steel surface
  • Preparation method of corrosion-mitigating film on steel surface

Examples

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Effect test

Embodiment 1

[0027] A method for preparing a corrosion-inhibiting film on a steel surface, comprising the following steps:

[0028] (1) Rust removal and cleaning of the steel surface: steel samples are treated with 300 # ~2000 # The metallographic sandpaper is polished step by step to obtain a flat surface. The standard is: the flatness measured by the dial indicator is less than 0.02, and then degreased by acetone ultrasonically for 5 minutes, and then rinsed with distilled water;

[0029] (2) Steel surface pretreatment: the cleaned steel sample is firstly placed in 0.1mol / L sulfuric acid solution at 20mA / cm 2 Cathode polarization at constant current density for 10 min, then put in 2mol·L -1 Etch in nitric acid solution for 3 seconds, quickly rinse with distilled water, blow dry with nitrogen, and place in a nitrogen drying box for use;

[0030] (3) Preparation of plant extract: collect the whole plant of Pteris fern, crush it to more than 300 meshes, and get the plant powder sample, m...

Embodiment 2

[0034] A method for preparing a corrosion-inhibiting film on a steel surface, comprising the following steps:

[0035] (1) Rust removal and cleaning of the steel surface: steel samples are treated with 300 # ~2000 # The metallographic sandpaper is polished step by step to obtain a flat surface. The standard is: the flatness measured by the dial indicator is less than 0.02, and then degreased by acetone ultrasonically for 5 minutes, and then rinsed with distilled water;

[0036] (2) Steel surface pretreatment: put the cleaned steel sample into 2mol L -1 Etched in nitric acid solution for 5 seconds, quickly rinsed with distilled water, dried with nitrogen, and placed in a nitrogen drying box for use;

[0037] (3) Preparation of plant extract: collect the whole plant of Pteris fern, crush it to more than 300 meshes, and get the plant powder sample, mix the powder sample and water according to the ratio of 10g:100mL according to the mass volume ratio, and then mix it at 25-30 S...

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Abstract

The invention relates to a preparation method of an environment-friendly corrosion-mitigating film on the steel surface, and belongs to the field of metal corrosion prevention. The method comprises the following steps that coarse grinding is conducted on a steel sample, and washing with distilled water is conducted after acetone ultrasonic degreasing; electrochemical or acid solution etching is conducted on the pretreated sample to obtain the activated steel surface, and the activated steel surface is washed with distilled water and dried with nitrogen gas for later use; collected plants are washed, dried and then crushed, a powder sample is extracted twice at different temperatures by taking water as a solvent, and then extracting solutions are combined, concentrated and fixed in volume;the extracting solution is prepared into an assembly solution with a proper concentration, and is poured into a closed assembly bottle for nitrogen charging and oxygen removal in a constant-temperature water bath kettle; and then the steel sample is put into a closed container to be assembled for a certain time, taken out, then washed with the distilled water, and dried with the nitrogen gas. According to the method, a film-forming substance is obtained by taking a plant body as a raw material, a corrosion-mitigating film layer is prepared on the steel surface through a self-assembly technology, and compared with a method taking an organic compound as a raw material, the method has the advantages of being low in cost, simple to operate, good in corrosion mitigation effect, environment-friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of metal anti-corrosion, and in particular relates to a method for preparing a corrosion-inhibiting film on a steel surface. Background technique [0002] The chemical properties of steel are relatively active, and it is easy to be corroded in the use environment. Corrosion of steel will cause serious economic losses and waste of resources. The close attention of scholars in the scientific field. Traditional steel surface anti-corrosion technologies, such as phosphating, passivation, electroplating, chemical plating and other surface processes, have gradually failed to meet the needs of sustainable development in today's society due to shortcomings such as high economic costs, complicated operations, and large environmental pollution. With the development of modern surface technology, some new coating technologies and surface modification technologies are emerging, which greatly expand the application field...

Claims

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Application Information

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IPC IPC(8): C23F11/10
Inventor 陈文
Owner CHUXIONG NORMAL UNIV
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