Synthesis and Corrosion Resistance of Amphoteric Gemini Surfactants

Intermediate N,N'-dialkyl-3-oxa-1,5-pentanediamine was synthesized by the reaction of primary amine with dihaloethyl ether, and then the intermediate was reacted with chloroacetic acid to obtain the target product amphoteric gemini surfactant N,N'-dialkyl-n, N'-dicarboxylic acyl-3-oxa-1, 5-pentanediamine. The amphoteric gemini surfactant was compounded to test its corrosion inhibition performance and compared with the corrosion inhibition effect of the amphoteric gemini surfactant alone. The results showed that the corrosion inhibition performance of the gemini surfactant and N-dodecylbenzimidazole gemini surfactant was better than that of the amphoteric gemini surfactant alone. In 1.0 mol/L HCl solution, when the amphiphilic gemini surfactant was compounded by 2:1, the corrosion current density of Q235 steel was the smallest, the radius of capacitive anti-arc was the largest, and the corrosion inhibition effect was the best.