Effect of Ethanolamines on Corrosion Inhibition of Ductile Cast Iron in Nitrite Containing Solutions
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In this work, synergistic corrosion inhibition effect of nitrite and 3 kinds of ethanolamines on ductile castiron using chemical and electrochemical methods was evaluated. This work attempts to clarify the synergisticeffect of nitrite and ethanolamines. The effects of single addition of TEA, DEA, and MEA, and mixedaddition of nitrite plus TEA, DEA or MEA on the corrosion inhibition of ductile cast iron in a tap waterwere evaluated. A huge amount of single addition of ethanolamine was needed. However, the synergisticeffect by mixed addition was observed regardless of the combination of nitrite and triethanolamines, buttheir effects increased in a series of MEA + nitrite > DEA + nitrite > TEA + nitrite. This tendency ofsynergistic effect was attributed to the film properties and polar effect; TEA addition couldn’t form thefilm showing high film resistance and semiconductive properties, but DEA or MEA could build the filmhaving relatively high film resistance and n-type semiconductive properties. Moreover, it can be explainedthat this behaviour was closely related to electron attractive group within the ethanolamines, and thus corrosioninhibition power depends upon the number of the electron attractive group of MEA, DEA, and TEA
Abstract
In this work, synergistic corrosion inhibition effect of nitrite and 3 kinds of ethanolamines on ductile castiron using chemical and electrochemical methods was evaluated. This work attempts to clarify the synergisticeffect of nitrite and ethanolamines. The effects of single addition of TEA, DEA, and MEA, and mixedaddition of nitrite plus TEA, DEA or MEA on the corrosion inhibition of ductile cast iron in a tap waterwere evaluated. A huge amount of single addition of ethanolamine was needed. However, the synergisticeffect by mixed addition was observed regardless of the combination of nitrite and triethanolamines, buttheir effects increased in a series of MEA + nitrite > DEA + nitrite > TEA + nitrite. This tendency ofsynergistic effect was attributed to the film properties and polar effect; TEA addition couldn’t form thefilm showing high film resistance and semiconductive properties, but DEA or MEA could build the filmhaving relatively high film resistance and n-type semiconductive properties. Moreover, it can be explainedthat this behaviour was closely related to electron attractive group within the ethanolamines, and thus corrosioninhibition power depends upon the number of the electron attractive group of MEA, DEA, and TEA
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