<正> 前言 羧酸盐是一种有用的缓蚀剂,它们对金属腐蚀的抑制作用已有研究报道。但关于二元羧酸对中性或弱碱性介质中碳钢的缓蚀能力和它们在电极/溶液界面的吸附行为未见系统研究报道。本工作研究分子结构对烷链二元羧酸缓蚀能力和吸附能力的影响,提出了二元羧酸在碳钢/溶液界面的可能吸附模型。
The corrosion inhibition and adsorption of biearboxylate on carbon steel in pH=9 carbonate-bicarbonate buffer solution at 25℃ has been investigated by weight loss method and electrochemical technique. Results show that the corrosion inhibition and adsorption of bicarboxylates decrease according to the following order: azelaic acid>sebacic acid>pimelic acid>suberic acid>adipic acid There is a zigzag relationship between the inhibition efficiency and the number of carbon atoms in bicarboxylate molecules, i. e. the bicarboxylie acid which contains odd number of carbon atoms is more efficient than the neighbouring acid whiates on carbon steel follows modified Bockris-Swinkels isotherm. The effects of the molecular structure of bicarboxylates on the corrosion inhibition and adsorption are also discussed.
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