| 铁在含Cl~-的酸溶液中阳极溶解研究 | |
| 叶国栋 | |
| Subtype | 硕士 |
| Thesis Advisor | 曹楚南 |
| 1991 | |
| Degree Grantor | 中国科学院金属腐蚀与防护研究所 |
| Place of Conferral | 中国科学院金属腐蚀与防护研究所 |
| Abstract | 本文利用近稳态循环伏安法在除氧含氯离子的酸性体系中，对纯铁的阳极溶解过程进行了详尽研究。从低极化区到高极化区发现有三个不同的Taftel斜率区域。从高极化区到低极化区，共有二个反应区域，高极化区与低极化区的反应机制分别与从低极化区到高极化区扫描时所得到的高极化区，低极化区反应机制相同。本文并用电极表面状态的变化而引起反应机制的改变，证明了从低极化区到高极化区铁电极溶解反应转变为什么单调上升，从高极化区到低极化区铁电极溶解反应转变有峰电流密度现象，并推导了峰电流密度与扫描速度的关系式。 |
| Other Abstract | Anodic dissolution of iron electrode in acidic chloride solution([Cl-] >0.25M, PH < 2) has been investigated by quesi-steady-state cyclic potential. The following empirical rate expressions for iron anodic dissolution have been determined from the experimental data. When scanning runs in the direction form low to high polarization (1) in low polarization range ia = Ka[Cl~-]~(-1.0) [OH~-]~(0.82)exp(FE/2TR) (2) in the middle polarization range ia = Ka[OH~-]~(-1.47)EXP(3FE/2RT) (3) in high polarization range ia = Ka exp(FE/2RT) when scanning runs in the direction from high to low polarization (1) in high polarization range ia = Ka exp(FE/2RT) (2) in low potential range ia = Ka[Cl~-]~(-0.97) [OH~-]~(0.89)exp(FE/2RT) Anodic dissolution is only inhibited by Cl~- in low polarization range while it is immune to the influence of OH~- in high polarization range. When the polarization potential sweeps from high to low polarization, the current/potential response exhibits anodic maxima. Cl~- concentration and pH influenced peak current density and peak potential. The increasing of scan rate leads o a decrease in summit current density, shifting the peak potential to negative value. This phenomenon can be accounted for by the change of adsorption layers on the metal surface. New mechanisms which are consistent with the empirical rate expressions have been developed. |
| Pages | 53 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/17487 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | 叶国栋. 铁在含Cl~-的酸溶液中阳极溶解研究[D]. 中国科学院金属腐蚀与防护研究所. 中国科学院金属腐蚀与防护研究所,1991. |
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