Synergistic Inhibition Between Polyvinylpyrollidone and Iodide Ions on Corrosion of Aluminium in HCl~!2008-10-03~!2008-11-08~!2009-01-06~!

S. Umoren, I. Obot, I. Igwe
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引用次数: 38

Abstract

The effect of iodide ions on the corrosion inhibition of aluminium in 2M HCl in the presence of polyvinylpy- rollidone (PVP) was studied using gasometric (hydrogen evolution) technique at 30-60 o C. Results obtained showed that PVP effectively reduces the corrosion rates of aluminium in the acid medium. Inhibition efficiency (%I) increases with increase in concentration of PVP. Increase in temperature increases corrosion rate but decreases inhibition efficiency. The addition of iodide ions enhanced the inhibition efficiency of PVP considerably. Adsorption of PVP and PVP + KI fol- lowed Temkin adsorption isotherm. Phenomenon of physical adsorption is proposed from the obtained E a and G ads values. The synergistic parameter (S1) obtained was found to be greater than unity, which indicates that the enhanced in- hibition efficiency caused by the addition of iodide is only due to synergistic effect.
聚乙烯鹿蹄烷酮与碘离子对HCl中铝腐蚀的协同抑制作用
采用气相析氢技术,在30 ~ 60℃条件下,研究了聚乙烯-咯利酮(PVP)对铝在2M HCl中缓蚀的影响。结果表明,PVP能有效降低铝在酸性介质中的腐蚀速率。抑制效率(%I)随PVP浓度的增加而增加。温度升高,腐蚀速率升高,缓蚀效率降低。碘离子的加入大大提高了PVP的抑制效果。PVP和PVP + KI的吸附遵循Temkin吸附等温线。根据所得的E a和G ads值,提出了物理吸附现象。得到的协同参数(S1)大于1,说明碘化物的加入对抑制效率的提高仅仅是由于协同作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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