Mn2+ 对304L和C25不锈钢在高温硝酸中腐蚀行为的协同作用机制与响应曲面模型研究
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孙欣, 屈佳伟, 高子淋, 郑越, 马爱利, 姚琳, 张连民, 郑玉贵
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Mechanism and Response Surface Model for Effect of Mn2+ on 304L and C25 Stainless Steels in High-temperature Nitric Acid
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SUN Xin, QU Jiawei, GAO Zilin, ZHENG Yue, MA Aili, YAO Lin, ZHANG Lianmin, ZHENG Yugui
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表2 C25和304L在含不同浓度Mn2+离子、不同温度的3 mol/L及6 mol/L硝酸溶液中的动电位极化曲线及EIS拟合结果
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Table 2 Potentiodynamic polarization curves and EIS fitting results for C25 vs 304L in 3 mol/L and 6 mol/L nitric acid solutions at varying temperatures with different Mn2+ ion concentrations
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| Temperature/ ℃ | Nitric acid concentration / mol·L-1 | Mn2+ ion concentration / g·L-1 | Ecror, SCE / mV | Icorr/ μA·cm-2 | Rs/ Ω·cm2 | CPE/ Ω-1 s-n cm-2 | n | Rf/ Ω·cm2 | χ-2 | Cef / F·cm-2 |
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| C25 | 80 | 6 | 0.1 | 838.0 | 11.14 | 0.32 | 9.71 × 10-5 | 0.93 | 7394 | 7.00 × 10-3 | 6.68 × 10-5 | | | | 1 | 835.4 | 9.20 | 0.47 | 8.32 × 10-5 | 0.93 | 9327 | 8.10 × 10-3 | 7.09 × 10-5 | | | | 5 | 834.4 | 15.74 | 0.35 | 1.05 × 10-4 | 0.92 | 7137 | 2.96 × 10-3 | 7.39 × 10-5 | | | | 10 | 848.9 | 15.13 | 0.35 | 1.19 × 10-4 | 0.91 | 5972 | 9.60 × 10-3 | 8.12 × 10-5 | | Boiling | 3 | 0.1 | 582.7 | 0.76 | 0.36 | 3.19 × 10-5 | 0.97 | 42500 | 7.96 × 10-3 | 3.21 × 10-5 | | | | 1 | 713.7 | 1.19 | 0.36 | 5.82 × 10-5 | 0.96 | 17740 | 3.05 × 10-3 | 5.83 × 10-5 | | | | 5 | 715.8 | 0.99 | 0.40 | 6.20 × 10-5 | 0.96 | 18130 | 6.53 × 10-3 | 6.23 × 10-5 | | | | 10 | 782.7 | 4.92 | 0.42 | 7.68 × 10-5 | 0.95 | 9208 | 8.09 × 10-3 | 7.53 × 10-5 | | | 6 | 0.1 | 879.2 | 58.22 | 0.30 | 1.74 × 10-4 | 0.90 | 2059 | 9.14 × 10-3 | 1.55 × 10-4 | | | | 1 | 880.6 | 55.60 | 0.29 | 1.77 × 10-4 | 0.90 | 1931 | 9.07 × 10-3 | 1.56 × 10-4 | | | | 5 | 880.3 | 50.47 | 0.30 | 1.75 × 10-4 | 0.89 | 1915 | 8.72 × 10-3 | 1.53 × 10-4 | | | | 10 | 887.6 | 84.67 | 0.33 | 2.16 × 10-4 | 0.89 | 1535 | 7.76 × 10-3 | 1.87 × 10-4 | | 304L | 60 | 3 | 0.1 | 513.0 | 0.53 | 0.44 | 4.21 × 10-5 | 0.96 | 59540 | 5.56 × 10-3 | 4.39 × 10-5 | | | | 1 | 631.8 | 0.86 | 0.74 | 6.00 × 10-5 | 0.95 | 48660 | 6.39 × 10-4 | 6.34 × 10-5 | | | | 5 | 617.4 | 1.11 | 0.41 | 7.21 × 10-5 | 0.95 | 36170 | 4.27 × 10-3 | 7.57 × 10-5 | | | | 10 | 625.8 | 1.14 | 0.41 | 6.97 × 10-5 | 0.95 | 29510 | 5.82 × 10-3 | 7.21 × 10-5 | | | 6 | 0.1 | 791.8 | 3.23 | 0.35 | 6.30 × 10-5 | 0.95 | 17250 | 7.87 × 10-3 | 6.32 × 10-5 | | | | 1 | 793.3 | 3.61 | 0.39 | 7.28 × 10-5 | 0.95 | 15200 | 6.96 × 10-3 | 7.32 × 10-5 | | | | 5 | 791.1 | 4.54 | 0.44 | 7.09 × 10-5 | 0.95 | 14070 | 8.00 × 10-3 | 7.09 × 10-5 | | | | 10 | 794.9 | 3.81 | 0.47 | 7.17 × 10-5 | 0.94 | 14240 | 7.04 × 10-3 | 7.18 × 10-5 | | 80 | 3 | 0.1 | 705.4 | 1.34 | 0.69 | 7.42 × 10-5 | 0.94 | 29570 | 1.14 × 10-3 | 7.78 × 10-5 | | | | 1 | 575.4 | 0.98 | 0.41 | 5.86 × 10-5 | 0.96 | 30190 | 3.61 × 10-3 | 6.02 × 10-5 | | | | 5 | 563.8 | 1.09 | 0.41 | 6.25 × 10-5 | 0.96 | 24800 | 4.95 × 10-3 | 6.37 × 10-5 | | | | 10 | 668.6 | 1.69 | 0.37 | 6.75 × 10-5 | 0.96 | 20790 | 6.60 × 10-3 | 6.86 × 10-5 | | | 6 | 0.1 | 834.8 | 14.18 | 0.33 | 8.69 × 10-5 | 0.93 | 5485 | 9.15 × 10-3 | 8.25 × 10-5 | | | | 1 | 852.7 | 14.62 | 0.31 | 1.02 × 10-4 | 0.92 | 4815 | 7.44 × 10-3 | 9.53 × 10-5 | | | | 5 | 851.8 | 14.52 | 0.32 | 1.14 × 10-4 | 0.91 | 5205 | 3.46 × 10-3 | 1.08 × 10-4 | | | | 10 | 837.9 | 12.96 | 0.34 | 1.03 × 10-4 | 0.93 | 4669 | 7.99 × 10-3 | 9.74 × 10-5 | | Boiling | 3 | 0.1 | 668.9 | 3.07 | 0.36 | 5.79 × 10-5 | 0.96 | 11340 | 6.33 × 10-3 | 5.69 × 10-5 | | | | 1 | 653.9 | 2.80 | 0.39 | 5.89 × 10-5 | 0.96 | 10270 | 6.61 × 10-3 | 5.77 × 10-5 | | | | 5 | 714.1 | 2.44 | 0.41 | 5.90 × 10-5 | 0.95 | 12060 | 5.93 × 10-3 | 5.80 × 10-5 | | | | 10 | 709.8 | 3.33 | 0.39 | 6.06 × 10-5 | 0.96 | 9674 | 1.56 × 10-3 | 5.91 × 10-5 | | | 6 | 0.1 | 876.6 | 78.88 | 0.28 | 1.38 × 10-4 | 0.92 | 1236 | 9.36 × 10-3 | 1.17 × 10-4 | | | | 1 | 879.1 | 91.72 | 0.39 | 1.48 × 10-4 | 0.91 | 1256 | 1.29 × 10-3 | 1.25 × 10-4 | | | | 5 | 875.4 | 79.29 | 0.76 | 1.67 × 10-4 | 0.90 | 1177 | 9.89 × 10-3 | 1.41 × 10-4 | | | | 10 | 881.0 | 91.41 | 0.31 | 1.62 × 10-4 | 0.91 | 1159 | 7.99 × 10-3 | 1.36 × 10-4 |
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