|
| Coordination of Cerium Salts in Electrochemical Passivation of Stainless Steel |
| Received:October 18, 2024 Revised:November 22, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2025.03.013 |
| KeyWord:electrochemical passivation 304 stainless steel sodium nitrate passivation films cerium salts corrosion resistance |
| Author | Institution |
| HU Jiezhen |
Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Guangdong Ocean University, Guangdong Zhanjiang , China |
| HU Xin |
Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Guangdong Ocean University, Guangdong Zhanjiang , China |
| GENG Baoyu |
Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Guangdong Ocean University, Guangdong Zhanjiang , China |
| DENG Peichang |
Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Guangdong Ocean University, Guangdong Zhanjiang , China |
| YANG Jingrong |
Key Laboratory of Corrosion and Protection of Ocean Engineering Equipment, Guangdong Ocean University, Guangdong Zhanjiang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Based on the traditional electrochemical passivation theory, the work aims to develop an efficient and environment-friendly electrochemical passivation method for 304 stainless steel and study the effect of cerium nitrate on corrosion resistance of electrochemical passivation film of 304 stainless steel. A stainless steel sample with passivation film was prepared through constant potential polarization by adding 0-20 g/L cerium nitrate into 1 mol/L sodium nitrate solution. The corrosion resistance and composition of different passivation films were studied by means of open-circuit potential (OCP), dynamic potential scanning, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). When the concentration of cerium nitrate was 15 g/L, the open-circuit potential of stainless steel reached the maximum value of 0.189 V, the self-corrosion potential was up to –0.24 V, the self-corrosion current density dropped to 3.61´10–5 mA/cm2 and the impedance was up to 2.48´106 Ω.cm2. By XPS analysis, when 15 g/L cerium nitrate was added, the oxide content of Cr in passivation film of stainless steel increased, and the oxide of Ce was also found. In the electrochemical passivation of 304 stainless steel with sodium nitrate solution as electrolyte solution, the transport channel of chromium in the passivation film can be widened by adding cerium nitrate to sodium nitrate solution, the distribution of chromium in the passivation film is homogenized and the passivation film is densified. |
| Close |
|
|
|