Longan seed and peel as environmentally friendly corrosion inhibitor for mild steel in acid solution: Experimental and theoretical studies

Liu Li Liao; Shi Mo; Hong Qun Luo; Nian Bing Li

doi:10.1016/j.jcis.2017.03.091

Longan seed and peel as environmentally friendly corrosion inhibitor for mild steel in acid solution: Experimental and theoretical studies

J Colloid Interface Sci. 2017 Aug 1:499:110-119. doi: 10.1016/j.jcis.2017.03.091. Epub 2017 Mar 23.

Authors

Liu Li Liao¹, Shi Mo¹, Hong Qun Luo², Nian Bing Li³

Affiliations

¹ Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
² Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China. Electronic address: luohq@swu.edu.cn.
³ Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China. Electronic address: linb@swu.edu.cn.

PMID: 28365436
DOI: 10.1016/j.jcis.2017.03.091

Abstract

Longan seed and peel were extracted and used for impeding the corrosion of mild steel in hydrochloric acid solution. Experimental analyses indicate that the water extract of Longan's seed and peel, a mixed type inhibitor, can be chemically adsorbed onto the steel surface, and its inhibition effect rises with increasing extract concentration. To understand the adsorption mechanism and the contributions of the four main compounds of the extract to corrosion protection effect, quantum chemical methods and infrared spectrum were also employed. Theoretically, four main antioxidant compounds were regarded as effective components in the water extract of Longan's seed and peel.

Keywords: Eco-friendly inhibitor; Electrochemical measurements; Longan; Mild steel; Modeling studies.