| LI You-you,ZHAO Xiao-yan,CAO Tie-shan,ZHAO Jie,MENG Xian-ming,YU Wei,CHENG Cong-qian.Dipolar Electrochemical Removal of Iron Contamination on Titanium Alloy Surface[J],51(9):226-233, 270 |
| Dipolar Electrochemical Removal of Iron Contamination on Titanium Alloy Surface |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.023 |
| KeyWord:titanium alloy iron pollution bipolar electrochemistry color detection |
| Author | Institution |
| LI You-you |
Dalian University of Technology, Liaoning Dalian , China |
| ZHAO Xiao-yan |
Dalian University of Technology, Liaoning Dalian , China |
| CAO Tie-shan |
Dalian University of Technology, Liaoning Dalian , China |
| ZHAO Jie |
Dalian University of Technology, Liaoning Dalian , China |
| MENG Xian-ming |
China Automotive Technology and Research Center Co., Ltd., Tianjin , China |
| YU Wei |
Dalian University of Technology, Liaoning Dalian , China |
| CHENG Cong-qian |
Dalian University of Technology, Liaoning Dalian , China |
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| Abstract: |
| Aiming at the important influence of cleaning medium and part shape on the removal of surface heterogeneous iron contamination in the clean and tidy manufacturing of corrosion-resistant alloy surfaces, a method for removing iron contamination by bipolar electrochemistry was proposed. Firstly, the electrochemical module in COMSOL software was used to establish the bipolar electrochemical model. The size of the electrolytic cell was 20 cm×10 cm, the size of the cleaning sample was 6 cm×0.2 cm, and the cleaning solution was the mixed solution of 3 mol/L Na2SO4 and 0.2 mol/L NaH2PO4. The potential distribution of electrolytic cell under different driving voltages (2 V, 6 V, 10 V, 30 V, 60 V) was calculated. The potential distribution changes in the cell were calculated when the sample was located in the middle of the cell and near the positive 1/4 when the driving voltage was 10 V. The potential data fitted with the potential distribution curve in the clearance solution 3 mm away from the lower surface of the sample. Secondly, a standard three-electrode system was used to measure the polarization curve of pure iron in the scavenging solution, in which a reference electrode was Ag/AgCl electrode and an auxiliary electrode was platinum electrode. The corrosion depth index was used to characterize the removal rate of iron pollution, and the removal rate curves under different parameters were drawn. Finally, iron pollution removal test was carried out on the surface of titanium alloy after shot peening. A 10 cm×15 cm platinum plate was used as the driving electrode, and the dc power supply was used. The removal effect was tested by the phenanthroline color reaction. In addition, the dynamic potential polarization scan and impedance-frequency scan were performed on the sample test surface before and after cleaning. This is used to analyze the corrosion resistance of the samples in general conditions before and after cleaning. The electrolyte was 3.5% NaCl, the scanning rate was 0.5 mV/s, and the scanning range was from ‒0.5 V to 1.5 V (relative to Ag/AgCl electrode). The results show that the voltage in the electrolytic cell is symmetrically distributed in the simulation, and the surface potential of the sample is 0 V. The removal rate of the sample in the middle of the electrolytic cell is higher than that near the positive electrode 1/4. With the increase of driving voltage, the effective removal length decreases, and the removal rate increases when the driving voltage exceeds 10 V. The color test shows that the iron contamination on the surface of the original titanium alloy sample is uneven, and the highest red chromaticity value was 15.5. After cleaning, the alloy surface changes from red to colorless, and the impedance spectroscopy shows that the corrosion resistance of the alloy surface increased. The experimental results are in good agreement with the simulation results. The bipolar electrochemistry can be used to remove the iron contamination on the surface of titanium alloy, which provides a new idea for high cleanliness manufacturing of titanium alloy surface. |
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