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http://dx.doi.org/10.14478/ace.2011.22.4.367

Synthesis and Anti-corrosion Properties of Succinic Acid Alkyl Half-Ester Derivatives  

Baek, Seung-Yeob (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology)
Kim, Young-Wun (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology)
Chung, Keun-Wo (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology)
Yoo, Seung-Hyun (Green Chemistry Research Division, Surfactant & Lubricant Research Team, Korea Research Institute of Chemical Technology)
Publication Information
Applied Chemistry for Engineering / v.22, no.4, 2011 , pp. 367-375 More about this Journal
Abstract
Succinic acid ester derivatives have been used as additives for the base oil of metal working fluids and pressure working oils. In this paper, a series of succinic acid alkyl half-esters were synthesized with over 97% yields by ring-opening reaction of succinic anhydride and fatty alcohol and were soluble in 100 N base oil within 1 wt% concentration. The structures and purities of ester derivatives were confirmed by $^1H-NMR$ and FT-IR spectrum and GC analysis. Anti-corrosion properties of the esters in sea water were evaluated through ASTM D665 method and weight loss method and compared to that of succinic alkyl esters without carboxylic acid group in the molecule. As the results, anti-corrosion properties of succinic acid alkyl half-esters with carboxylic acid group were better than those of succinic acid alkyl esters without carboxylic acid group. And, Anti-corrosion properties of the esters with a shorter alkyl chain of high concentration showed better performance than those with longer alkyl chain of low concentration. Inhibition efficiency % (IE%) of the esters was over 95% in the concentration of 80 ppm and corrosion rate (CR) was below 0.3 mm/year at the same concentration. Thus, the corrosion properties of succinic acid alkyl half-esters result from the carboxylic acid groups in molecules.
Keywords
anti-corrosion properties; succinic acid alkyl half-ester; IE%; CR;
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