| YUAN Jing-jiu,CHEN Chao-yi,LI Jun-qi,QUAN Bian-li,FU Hui,GAI Jian-xuan.Effect of S2O32‒ Concentration in Sodium Aluminate Solution on Corrosion Behavior of 12Cr1MoV Steel[J],50(3):301-307 |
| Effect of S2O32‒ Concentration in Sodium Aluminate Solution on Corrosion Behavior of 12Cr1MoV Steel |
| Received:June 01, 2020 Revised:July 08, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.03.032 |
| KeyWord:sodium aluminate solution 12Cr1MoV steel corrosion behavior S2O32‒ |
| Author | Institution |
| YUAN Jing-jiu |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
| CHEN Chao-yi |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
| LI Jun-qi |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
| QUAN Bian-li |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
| FU Hui |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
| GAI Jian-xuan |
College of Materials and Metallurgy, Guizhou University, Guiyang , China;Key Laboratory of Metallurgical Engineering and Process Energy Saving of Guizhou Province, Guiyang , China |
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| Abstract: |
| The purpose of the research is to study the corrosion behavior of 12Cr1MoV steel in sodium aluminate solution containing S2O32‒ and explore the effect of S2O32‒ on corrosion behavior under simulated evaporation conditions of mother liquor in producing alumina oxide. By carrying out the immersion corrosion to the 12Cr1MoV steel in the high-pressure reaction kettle, the corrosion rate of the steel, the morphology of the corrosion products, distribution of elements, and phase composition are obtained. In order to study the effect of S2O32‒ concentration on the corrosion behavior of 12Cr1MoV steel, a polarization curve and AC impedance test are used. The increased in S2O32‒ concentration has accelerated the corrosion rate of 12Cr1MoV steel gradually. The concentration increases from 1 g/L to 5 g/L, and the corrosion rate increases from 0.78 g/(m2.d) to 1.67 g/(m2.d). Corrosion products are mainly composed of Fe and O elements and a small amount of Al and S elements. When the concentration is less than 4 g/L, Fe2O3, FeO and Fe(1‒x)AlxOOH (x≤0.19) are the main corrosion products; and when the concentration is more than 4 g/L, Fe3O4 and a small amount of Al2O3 are found. With the increasing concentration of S2O32‒,.Rf and Rct increase first and then decrease, and reaches the maximum value at 4 g/L, which are 1284 Ω.cm2 and 816 Ω.cm2, respectively. At 5 g/L, Rf and Rct drop to 963 Ω.cm2 and 434 Ω.cm2, respectively. When the concentration of S2O32‒ increases from 1 g/L to 5 g/L, the corrosion current density increases from 25.25 µA/cm2 to 238.28 µA/cm2 (maximum). The corrosion rate law obtained from the polarization curve test is consistent with the high temperature immersion law. The concentration of S2O32‒ in sodium aluminate solution has a profound effect on the corrosion rate of 12Cr1MoV steel. Increasing the concentration of S2O32‒ in the solution can accelerate the corrosion rate of 12Cr1MoV steel. When it is greater than 4 g/L, the Fe3O4 layer formed on the12Cr1MoV steel surface protects the steel. Increasing the concentration will increase the Jcorr of 12Cr1MoV steel. |
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