Hyperbranched molecules having multiple functional groups as effective corrosion inhibitors for Al alloys in aqueous NaCl

Xiaolei Ren; Shenying Xu; Xingxing Gu; Bochuan Tan; Jiangyu Hao; Li Feng; Weihua Ren; Fang Gao; Shengtao Zhang; Yiran Xiao; Lan Huang

doi:10.1016/j.jcis.2020.10.041

Hyperbranched molecules having multiple functional groups as effective corrosion inhibitors for Al alloys in aqueous NaCl

J Colloid Interface Sci. 2021 Mar:585:614-626. doi: 10.1016/j.jcis.2020.10.041. Epub 2020 Oct 20.

Authors

Xiaolei Ren¹, Shenying Xu², Xingxing Gu³, Bochuan Tan⁴, Jiangyu Hao⁴, Li Feng⁴, Weihua Ren⁴, Fang Gao⁵, Shengtao Zhang⁴, Yiran Xiao⁶, Lan Huang³

Affiliations

¹ Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China. Electronic address: xlren@ctbu.edu.cn.
² College of Materials Science and Chemical Engineering, YiBin University, Sichuan 644000, China.
³ Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
⁴ College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400067, China.
⁵ College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400067, China. Electronic address: fgao@cqu.edu.cn.
⁶ School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

PMID: 33131783
DOI: 10.1016/j.jcis.2020.10.041

Abstract

Hyperbranched molecules are a kind of promising materials due to their unique structures. In this work, two hyperbranched molecules (GON and GOH) are used as effective inhibitors for Al alloys in NaCl solution. Their inhibitive performances are evaluated by electrochemical measurements and surface characterization. The results indicate that inhibition performances of GON and GOH are closely related to the concentrations, influenced by the combination of steric hindrance and bonding effects. At relatively low concentrations (0.03-0.10 mM), GON displays a more pronounced ability to inhibit corrosion than GOH, owing to more anchoring functional groups. Oppositely, GOH has good inhibition performance at higher concentrations (0.50-1.00 mM). The interaction between the Al electrode and GOH results in the formation of a more condenser protective film than GON at high concentrations. In addition, the adsorption mechanism of two hyperbranched molecules is revealed by theoretical calculations.

Keywords: Adsorption mechanism; Al alloys; Electrochemical methods; Functional groups; Hyperbranched molecule; Theoretical calculations.