| ZHANG Chang-song,ZHOU Li-min,YAN Dong,HOU Shao-gang,WANG Shu-hong,WU Wei-ming.Electrochemical Black of 316L Stainless Steel[J],51(12):217-224, 254 |
| Electrochemical Black of 316L Stainless Steel |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.12.022 |
| KeyWord:electrochemical coloring anodic oxidation environmental protection colored stainless steel corrosion curve |
| Author | Institution |
| ZHANG Chang-song |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
| ZHOU Li-min |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
| YAN Dong |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
| HOU Shao-gang |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
| WANG Shu-hong |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
| WU Wei-ming |
School of Chemical and Environmental Engineering, Anyang Institute of Technology, Henan Anyang , China |
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| Abstract: |
| The purpose of this study is to obtain the best electrochemical process conditions for surface blackening by adjusting the surface composition and structure of 316L stainless steel and improving the surface performance. The electrochemical method was adjusted to oxide the surface of 316L stainless steel after degreasing, polishing and activation processes. The effects of the concentration of the activated solution, the area ratio of the anode and cathode plates, the amount of boric acid in the electrolyte, the current densities of the electrochemical oxidation, the termination voltages, the anodization time and the oxidation temperature on the coloring effect, binding force and reproducibility of the colored film were studied in detail; the surface corrosion resistance performance of the blackened stainless steel and the uncolored stainless steel in acid, alkali, and neutral salt solution systems were analyzed respectively; the effects of coloring conditions on the performance of the coloring film and the coloring mechanism were also discussed. The results showed that the concentration of phosphoric acid activation solution had a significant impact on the coloring effect, the higher the concentration, the more pure the black color of the activated stainless steel plate would be, but the bonding force of the film with the substrate would become worse; the composition of the coloring liquid determined the ranges of color change of the coloring film; the coloring time was the main factor that would affect the color of the colored film, with the extension of the coloring time, the color of the film changes into blue, yellow, red, and black colors in series; the temperature was the main factor that would affect the bonding force of the color film layer with the stainless steel substrate. It is found that the film layer formed at 25 ℃ displayed the strongest bonded force with the substrate. The area ratio of the anode to cathode was the main factor that would affect the uniformity of the colored film, when the area ratio of the anode to cathode was 1∶1, the formed colored film showed the most uniform film. The result shows that the best conditions for 316L stainless steel with pure black colored film are obtained, the concentration of phosphoric acid activated solution is 1.5 mol/L, the composition of the electrolytic coloring solution is K2Cr2O7 30 g/L, MnSO4.4H2O 20 g/L, (NH4)2SO4 40 g/L and H3BO3 10 g/L, the corresponding area ratio of the cathode to anode plate is 1∶1, the coloring temperature is 25 ℃, the coloring voltage is from 2.0 to 4.0 V, the anode current density (DA) is 0.20 A/dm2, and the anode oxidation time is about 720 s; the study on the corrosion resistance of the black stainless steel film showed that the corrosion resistance is significantly improved in a neutral aqueous solution containing chloride ions. This study provides a strategy to color the stainless steel plate into a series of colors under mild conditions by utilizing electrochemical process, and the colored film on the surface shows superior wearing resistance, corrosion resistance, and film contaces tightly with the stainless steel sbustrate. |
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