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Carbon steel surface treatment method

A surface treatment, carbon steel technology, applied in the direction of metal material coating process, etc., can solve the problems of not meeting the corrosion resistance requirements of steel components, low compactness of blackened film structure, etc., to achieve increased resistance, fine crystal particles, and improved The effect of corrosion resistance

Active Publication Date: 2018-01-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The structure of the blackened film prepared by the existing technology is low in compactness, which cannot meet the corrosion resistance requirements of steel components during storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A carbon steel workpiece with a size of 15×10×4mm is first subjected to ultrasonic shot peening treatment with projectiles with a diameter of 4mm for 30 minutes, and then with projectiles with a diameter of 2mm for 60 minutes;

[0045] The workpiece after shot blasting is degreased with chemical degreasing agent at 70°C for 12 minutes. The chemical degreasing agent includes: sodium hydroxide, sodium carbonate, sodium silicate and water. The content of sodium hydroxide in the chemical degreasing agent The concentration is 13g / L, the concentration of sodium carbonate in the chemical degreasing agent is 12g / L, the concentration of sodium silicate in the chemical degreasing agent is 12g / L, and the workpiece is rinsed with clear water after degreasing;

[0046] The workpiece after degreasing is pickled and derusted at normal temperature. The pickling solution includes sulfuric acid, hydrochloric acid, nitric acid and water. The concentration of sulfuric acid in the pickling s...

Embodiment 2

[0052] The blackening film prepared by the embodiment of the present invention 1 and comparative example 1 is observed histologically, and the observation results are as follows: image 3 with Figure 4 as shown, image 3 The topography figure of the blackening film prepared for Comparative Example 1 of the present invention, Figure 4 The topography figure of the blackened film prepared for Example 1 of the present invention, by image 3 with Figure 4 It can be seen that the continuity of the crystalline particles of the blackened film prepared without shot peening is destroyed at the grinding scratches of the substrate, and these corners may become weak positions of the blackened film, which affects its anti-corrosion protection; and blackened The crystalline grain size of the film is relatively large, with an average diameter of about 30 μm. The blackened film prepared after shot peening is finer and more uniform, has fewer defects, and the crystal grain size of the bl...

Embodiment 3

[0054]The blackened film prepared by Example 1 of the present invention and Comparative Example 1 is used in a NaCl solution with a mass concentration of 3.5% to perform an electrochemical corrosion behavior test using a CHI700E series electrochemical workstation provided by CH Instruments Ins, and the test results are as follows: Figure 5 as shown, Figure 5 Polarization curves of the blackened film prepared in Example 1 and Comparative Example 1 of the present invention in NaCl solution with a mass concentration of 3.5%.

[0055] Depend on Figure 5 It can be seen that compared with the blackened film prepared without shot peening, the position of the polarization curve of the blackened film prepared after shot peening changes, and moves significantly to the upper left, that is, the self-corrosion potential shifts positively, and the self-corrosion current density decreases . After calculation, the self-corrosion potential of the blackened film prepared without shot peeni...

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Abstract

The invention provides a carbon steel surface treatment method. The carbon steel surface treatment method comprises the following steps: the surface shot blasting treatment is performed on carbon steel; and the surface of the shot-blasted carbon steel is blackened. Compared with the prior art, the carbon steel surface treatment method effectively combines the surface shot blasting with the blackening treatment; as the shot blasting treatment is firstly performed on the surface of the carbon steel, crystal particles of blackening films formed by subsequent blackening treatment are fine, uniformand compact; through the shot blasting treatment, the self-corrosion potential of the blackening films is improved, and the self-corrosion current density is reduced; and meanwhile, through the shotblasting treatment, the resistance of the blackening films is increased, and the saline immersion resistance is higher. As the shot blasting treatment is performed before the blackening treatment, thecorrosion resistance of the prepared blackening films can be improved.

Description

technical field [0001] The invention relates to the technical field of carbon steel, in particular to a carbon steel surface treatment method. Background technique [0002] Carbon steel is widely used in steel structures, but its corrosion problem seriously affects the service life and safety of steel components, causing huge economic losses. Forming a protective film on the surface of carbon steel is an effective method to alleviate the corrosion of carbon steel. Blackening treatment is a simple and fast film forming method, which is widely used. The blackening film formed by the blackening treatment isolates the metal surface from the environment, thereby playing a protective role. [0003] The structure of the blackened film prepared by the prior art has low compactness and cannot meet the corrosion resistance requirements of steel components during storage. Therefore, developing a new carbon steel surface treatment technology to improve the performance of the blackeni...

Claims

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Application Information

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IPC IPC(8): C23C22/78C23C22/62
Inventor 吴桐刁铮亮蒋俊杰黎颖张留艳
Owner GUANGDONG UNIV OF TECH
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