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
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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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