Effect of molecular structure of aniline-formaldehyde copolymers on corrosion inhibition of mild steel in hydrochloric acid solution.
Aniline-formaldehyde copolymers with different molecular structures have been prepared and investigated for the purpose of corrosion control of mild steel in hydrochloric acid. The copolymers were synthesized by a condensation polymerization process with different ratios of aniline to formaldehyde in acidic precursor solutions. The corrosion inhibition efficiency of as-synthesized copolymers for Q235 mild steel was investigated in 1.0 mol L(-1) hydrochloric acid solution by weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy, respectively. All the results demonstrate that as-prepared aniline-formaldehyde copolymers are efficient mixed-type corrosion inhibitors for mild steels in hydrochloric acid. The corrosion inhibition mechanism is discussed in terms of the role of molecular structure on adsorption of the copolymers onto the steel surface in acid solution.
Faculty of Chemistry and Chemical Engineering, Qingdao University, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province, 308 Ningxia Road, Qingdao 266071, China. Electronic address: zhangyanchem@qdu.edu.cn.
Yan
Y
Zhang
National Centre for Advanced Tribology at Southampton (nCATS), Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK.
Mengyan
M
Nie
National Engineering Center for Marine Corrosion Protection, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Xiutong
X
Wang
Faculty of Chemistry and Chemical Engineering, Qingdao University, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province, 308 Ningxia Road, Qingdao 266071, China.
Yukun
Y
Zhu
Faculty of Chemistry and Chemical Engineering, Qingdao University, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province, 308 Ningxia Road, Qingdao 266071, China.
Fuhua
F
Shi
Faculty of Chemistry and Chemical Engineering, Qingdao University, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles of Shandong Province, 308 Ningxia Road, Qingdao 266071, China; Laboratory of Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 18 Tianshui Middle Road, Lanzhou 730000, China. Electronic address: yjq@licp.cas.cn.
Jianqiang
J
Yu
National Engineering Center for Marine Corrosion Protection, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Baorong
B
Hou
D000814:Aniline Compounds / Q000737:chemistry*; D003343:Corrosion; D004563:Electrochemistry; D005557:Formaldehyde / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry*; D011108:Polymers; D012996:Solutions; D013232:Steel / Q000737:chemistry*
D000814:Aniline Compounds; D011108:Polymers; D012996:Solutions; D013232:Steel; D005557:Formaldehyde; D006851:Hydrochloric Acid
Aniline–formaldehyde copolymer; Anticorrosion; Inhibitor; Mild steel; Molecular structure