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Surface treatment method for improving corrosion resistance of carbon steel

A technology for surface treatment and corrosion resistance, which is applied in the field of surface treatment for the preparation of corrosion-inhibiting anion intercalated iron-based hydrotalcite films on the surface of carbon steel, which can solve the difficulties of hydrotalcite films, limited treatment methods, and unfavorable large-scale Application and other issues, to achieve large-scale industrial application, low cost, good bonding effect

Inactive Publication Date: 2019-05-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the current public reports, the surface treatment method of this type of hydrotalcite film is limited to light alloys such as magnesium alloy and aluminum alloy, and it is difficult to prepare a hydrotalcite film with anti-corrosion properties on the surface of steel materials such as carbon steel.
Moreover, the preparation of hydrotalcite film layers on metal surfaces usually requires high-temperature hydrothermal treatment, which needs to be processed in a high-pressure reactor, which is not conducive to large-scale application.

Method used

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  • Surface treatment method for improving corrosion resistance of carbon steel
  • Surface treatment method for improving corrosion resistance of carbon steel
  • Surface treatment method for improving corrosion resistance of carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A corrosion-inhibiting anion-intercalated iron-based hydrotalcite film was prepared on the surface of carbon steel, and the corrosion resistance of the film was investigated.

[0025] (1) Pretreatment of carbon steel surface:

[0026] The surface of Q235 carbon steel sample of 15mm × 15 mm × 3 mm was polished with 150#, 240#, 400#, 800#, 1000# silicon carbide sandpaper, rinsed with deionized water, dried with cold wind, and dried in anhydrous Ultrasonic cleaning in ethanol for 5 minutes, take out, rinse with deionized water, dry with cold air, and set aside.

[0027] (2) The iron-based hydrotalcite film layer was directly prepared on the surface of the carbon steel sample:

[0028] At room temperature, weigh 0.002 mol of NiSO 4 •6H 2 O, add deionized water to prepare 1000 μmol / L NiSO 4 Aqueous solution, take 400mL for later use;

[0029] Hang the Q235 carbon steel sample treated in step (1) vertically in the above 1000 μmol / L NiSO 4 After soaking in the solution f...

Embodiment 2

[0035] A corrosion-inhibiting anion-intercalated iron-based hydrotalcite film was prepared on the surface of carbon steel, and the corrosion resistance of the film was investigated.

[0036] (1) Pretreatment of carbon steel surface:

[0037] The surface of Q235 carbon steel sample of 15mm × 15 mm × 3 mm was polished with 150#, 240#, 400#, 800#, 1000# silicon carbide sandpaper, rinsed with deionized water, dried with cold wind, and dried in anhydrous Ultrasonic cleaning in ethanol for 5 minutes, take out, rinse with deionized water, dry with cold air, and set aside.

[0038] (2) The iron-based hydrotalcite film layer was directly prepared on the surface of the carbon steel sample:

[0039] At room temperature, weigh 0.004 mol of NiSO 4 •6H 2 O, add deionized water to prepare 2000 μmol / L NiSO 4 Aqueous solution, take 300mL for later use;

[0040] Hang the Q235 carbon steel sample treated in step (1) vertically in the above 2000 μmol / L NiSO 4 After soaking in the solution f...

Embodiment 3

[0045] A corrosion-inhibiting anion-intercalated iron-based hydrotalcite film was prepared on the surface of carbon steel, and the corrosion resistance of the film was investigated.

[0046] (1) Pretreatment of carbon steel surface:

[0047] The surface of Q235 carbon steel sample of 15mm × 15 mm × 3 mm was polished with 150#, 240#, 400#, 800#, 1000# silicon carbide sandpaper, rinsed with deionized water, dried with cold wind, and dried in anhydrous Ultrasonic cleaning in ethanol for 5 minutes, take out, rinse with deionized water, dry with cold air, and set aside.

[0048] (2) The iron-based hydrotalcite film layer was directly prepared on the surface of the carbon steel sample:

[0049] At room temperature, weigh 0.002 mol of ZnSO 4 •7H 2 O, add deionized water to prepare 1000 μmol / L ZnSO 4 Aqueous solution, take 300mL for later use;

[0050] Hang the Q235 carbon steel sample treated in step (1) vertically in the above 1000 μmol / L ZnSO 4 After soaking in the solution f...

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Abstract

The invention provides a surface treatment method for improving the corrosion resistance of carbon steel, and belongs to the technical field of material surface treatment. According to the surface treatment method, an iron-based layered double hydroxide film with a corrosion inhibiting anion intercalation is prepared on the surface of the carbon steel directly, the corrosion resistance of the carbon steel can be improved, the adhesion of an organic coating applied to the surface of the carbon steel is increased, and the long-term corrosion resistance of the carbon steel is enhanced. The surface treatment method mainly comprises the following steps that (a) pretreatment is carried out on the surface of the carbon steel; (b) an iron-based layered double hydroxide film is prepared on the surface of the carbon steel; and (c) the iron-base layered double hydroxide film obtained in the step (b) is subjected to corrosion inhibiting anion exchange to prepare the iron-based layered double hydroxide film with the corrosion inhibiting anion intercalation. The surface treatment method is easy to operate, low in cost and stable in performance, and has high practical application value.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and relates to a surface treatment method for improving the corrosion resistance of carbon steel, in particular to a surface treatment method for preparing a corrosion-inhibiting anion-intercalated iron-based hydrotalcite film layer on the surface of carbon steel. Background technique [0002] Carbon steel is widely used in various industries due to its simple production process, low price, and excellent mechanical properties. However, the corrosion resistance of carbon steel is poor, which restricts its application in corrosive environments such as chloride ions. When carbon steel and water and CO in the air 2 Corrosion will inevitably occur in contact with other media, which not only causes waste of resources and energy, but also may cause serious safety accidents. People improve the corrosion resistance of carbon steel through various surface treatment technologies, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12C23C18/04C23F11/12C23F11/18
Inventor 吴俊升李晓刚彭光春王怡张博威
Owner UNIV OF SCI & TECH BEIJING
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