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The Change Of Corrosion Inhibition Behavior Of Tetradecyl Phosphate Ester At Elevated Temperatures

The Change of Corrosion Inhibition Behavior of Tetradecyl Phosphate Ester at Elevated Temperatures
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Organic corrosion inhibitors (CIs) are widely employed in the oil and gas industry to protect carbon steel pipelines against internal corrosion. The high inhibition efficiency of organic CIs at extremely low concentration can be attributed to their amphiphilic molecular structures. This structure enables the formation of self-assembled films that act against corrosion via the adsorption of their hydrophilic head group on the steel substrate and the repellence of aqueous corrosive species by their hydrophobic tail. Consequently, any factors affecting the film formation of organic CIs could lead to changes in inhibition behaviors. 

Product Number: 51322-18053-SG
Author: Shuai Ren, Yi He, Xi Wang, David Young, Marc Singer, Maalek Mohamed-Saïd, Sheyla Camperos
Publication Date: 2022
Industries: Coatings and Linings , Corrosion Monitoring and Control , Coatings
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Having a better understanding of the effect of increased temperature on the performance of organic corrosion inhibitors (CIs) is beneficial for their usage in high temperature environments. The present work focuses on studying the effect of temperature on inhibition behaviours of an in-house synthesized CI model compound, tetradecyl phosphate ester (PE-C14), in a simulated refinery environment. Surface saturation concentrations at three temperatures (25°C, 55°C, and 80°C) are determined by exploiting corrosion rate evolution. At low temperature (25˚C), a gelatinous film formed on the rotating cylinder electrode (RCE) surface that significantly affected the limiting current, although the PE-C14 layer was poorly adherent. At elevated temperatures (55˚C and 80˚C), a thick, adherent and readily detectable by EDS and Raman spectroscopy, PE-C14 layer formed on the RCE surface to achieve much lower corrosion rate (inhibition efficiency close to 100%) with relatable surface saturation concentrations. 

Having a better understanding of the effect of increased temperature on the performance of organic corrosion inhibitors (CIs) is beneficial for their usage in high temperature environments. The present work focuses on studying the effect of temperature on inhibition behaviours of an in-house synthesized CI model compound, tetradecyl phosphate ester (PE-C14), in a simulated refinery environment. Surface saturation concentrations at three temperatures (25°C, 55°C, and 80°C) are determined by exploiting corrosion rate evolution. At low temperature (25˚C), a gelatinous film formed on the rotating cylinder electrode (RCE) surface that significantly affected the limiting current, although the PE-C14 layer was poorly adherent. At elevated temperatures (55˚C and 80˚C), a thick, adherent and readily detectable by EDS and Raman spectroscopy, PE-C14 layer formed on the RCE surface to achieve much lower corrosion rate (inhibition efficiency close to 100%) with relatable surface saturation concentrations. 

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Product Number: 51322-17529-SG
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