| Autor: |
LONG Yuan, YAN Chen-xi, HAO Yu-lin, QI Zhi-kun, LIU Hua-sai, LI Xue-tao |
| Jazyk: |
čínština |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Cailiao Baohu, Vol 56, Iss 1, Pp 50-57 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1001-1560 |
| DOI: |
10.16577/j.issn.1001-1560.2023.0008 |
| Popis: |
In order to study the effect of honeycomb surface on the phosphating properties of hot-rolled pickling plate， and to analyze the reasons for the formation of honeycomb surface as well as the mechanism for the honeycomb surface to influence the growth of phosphating film， a phosphating film was prepared on the honeycomb surface of steel plate. Glow spectrometer and roughness tester were used to analyze the surface element distribution and the roughness of steel plate surface. Scanning electron microscope was used to observe the morphology of the steel plate surface and phosphating film. X-ray diffraction was used to analyze the P ratio of phosphating film. And the electrochemical workstation was used to study the corrosion resistance of phosphating film and the activity of steel plate with honeycomb surface in phosphating solution. Results showed that on the honeycomb surface of pickling plate， the phosphorization film coverage rate was less than 100%， the P ratio of phosphorization film was 70.1%， the impedance was 1.6×104 Ω·cm2， the self-corrosion potential was about -0.61 V， the self-corrosion current was 10 μA/cm2， and all the properties were worse than those of the phosphating film having typical surface morphology. Through the simulation experiment of diatom mud containing Cl-，it was confirmed that the honeycomb morphology was caused by excessive erosion of Cl-. After surface conditioning treatment， the open-circuit potential of steel plate with honeycomb surface in the phosphating solution shifted positively significantly，and the reaction activity was reduced. The reason was that the surface conditioning solution left in the honeycomb microstructure after surface conditioning treatment prevented the phosphating solution from contacting with the steel plate， slowed down the dissolution process of the steel plate， resulting in a low concentration of Fe2+ on the surface of the steel plate， and thus inhibited the Fe2+， Zn2+ and phosphate ions from forming phosphating film on the surface of the steel plate. As a result， the coverage rate of phosphating film on the honeycomb surface of pickling plate was insufficient. Therefore，the honeycomb surface was not conducive to the growth of the phosphating film. So，it was necessary to control the stability of the pickling process and check the pre-rinsing flow parameters，drying roller，rinsing tank and rinsing nozzle equipment regularly to avoid honeycomb surface of the pickling plate. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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