The electrochemistry of iron in methanolic solutions and its relation to corrosion
The electrochemistry of iron in methanolic solutions and its relation to corrosion
复制标题
DOI：
10.1016/0010-938x(95)00052-l
复制
发表时间：
1995-09
影响因子：
8.3
通讯作者：
C. Brossia;E. Gileadi;R. Kelly
中科院分区：
文献类型：
--
作者：
C. Brossia;E. Gileadi;R. Kelly
铁在甲醇中的腐蚀行为，其依赖于存在低水平的侵蚀物质，并在电化学反应发生的基础上对这些依赖的解释已经确定。对低浓度酸、氯化物和硫酸盐的腐蚀现象的定量分析表明，主要的一级效应是酸的加入导致腐蚀速率的增加和腐蚀电位的升高。主要的二级相互作用是通过同时加水来抑制酸对腐蚀速率的影响。对与铁在甲醇中腐蚀有关的阴极反应的性质和动力学的研究表明，水对腐蚀的抑制主要是由于质子的迁移率随着水含量的增加而降低。这种对腐蚀的抑制是由于水相对于甲醇的优先质子化而阻碍了质子跳跃机制而发生的。
The corrosion behavior of iron in methanol, its dependence on the presence of low levels of aggressive species, and an interpretation of these dependencies on the basis of the electrochemical reactions occurring have been determined. A quantitative analysis of the phenomenology of the corrosion behavior due to low (mM) levels of acid, chloride and sulfate has shown that the dominant first order effects are the increase in corrosion rate and elevation in corrosion potential due to the addition of acid. The dominant second order interaction between species is the inhibition of the acid effect on corrosion rate by the simultaneous addition of water. A study of the nature and kinetics of the cathodic reactions relevant to the corrosion of iron in methanol showed that inhibition of corrosion by water is primarily due to the decrease in the mobility of the proton with increasing water content. This inhibition of corrosion occurs by hindrance of the proton hopping mechanism due to preferential protonation of water vs methanol.