可控微环境下阴离子对铁／硫酸体系阳极溶解过程的影响

将流动注射技术与半封闭电极相结合，研究了硫酸根离子、氯离子和柠檬酸根离子对铁／硫酸体系阳极溶解过程的影响．在恒电位极化过程中，向电极／溶液界面分别注射含以上3种离子的溶液，通过比较注射不同溶液时的电化学行为，分析3种阴离子对铁阳极溶解过程的影响机理．氯离子具有吸附性和侵蚀性，电位较低时，更多地表现为吸附性，电位较高时，更多地表现为侵蚀性；柠檬酸根离子具有缓蚀性，能够吸附在电极表面，抑制铁在硫酸溶液中的腐蚀；硫酸根离子则对铁的阳极溶解过程影响不大．实验结果表明，流动注射技术与半封闭电极相结合是研究金属腐蚀的一种有效新方法．

Effects of anions on the anodic dissolution of iron/sulphuric acid system in the controlled environment

The combination of the flow injection and the partially-closed electrode has been used to study the effects of SO4^2-, Cl^- and C5 H7O5 COO^- on the anodic dissolution processes of iron in sulphuric acid solution. The solutions containing the respective anions are injected into the vicinity of the partially-closed electrode during the potentiostatic polarization, and their effects on the anodic dissolution process of iron are analyzed by comparing the variations in the electrochemical behavior after the injection. The results show Cl^- presents adsorbability at lower potential but aggressivity at higher potential. C5 H7O5 COO^- can adsorb on the surface of the electrode and inhibit the corrosion of iron, while SO4^2- has little effect. At the same time, the flow injection technique combined with the partially-closed electrode is an effective approach to investigate the corrosion processes of metals.