Related Experiment Video
Updated: Jul 8, 2025
Determining the Chemical Composition of Corrosion Inhibitor/Metal Interfaces with XPS: Minimizing Post Immersion Oxidation
Published on: March 15, 2017
Halogen-Free Functional Quaternary Ammonium-Based Ionic Liquid as an Ecofriendly Corrosion Inhibitor for Q235 Steel
Wenjun Xiang1,2,3, Chen Zhao3, Chaoyang Zhang2,3
1School of Chemical Engineering, Northwest Minzu University, 730030 Lanzhou, China.
Abstract:
A halogen-free quaternary ammonium-based ionic liquid functionalized with benzotriazole, BTA-16-BTA, was synthesized. Its anticorrosion effects on Q235 steel were evaluated in two different acids (6 M HCl or 1 M H3PO4) by weight loss and electrochemical tests. BTA-16-BTA shows the best performance at 30 °C with the highest inhibition efficiencies of 98.84% in 6 M HCl and 96.40% in 1 M H3PO4. The adsorption behavior of BTA-16-BTA molecules on Q235 steel in HCl solution obeys the Langmuir isotherm with an adsorption energy of about -40 kJ·mol-1, which implies chemisorption. Quantum chemistry calculation indicates that the chemical adsorption originated from the injection of π-electrons from inhibitor molecules into empty 3d orbitals of Fe atoms. The tight adsorption of inhibitor molecules and associated dehydration of the steel surface promoted the corrosion inhibition in HCl solutions. In H3PO4 solutions, passivation by phosphate anions and adsorption of inhibitor molecules contributed synergistically to the excellent anticorrosion performance.
Related Concept Videos
01:27Corrosion of Reinforcement
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
00:56Extraction: Advanced Methods
02:49Corrosion
01:01Acid Halides to Carboxylic Acids: Hydrolysis
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
03:46Qualitative Analysis
For instance, group IV...
02:45Alkyl Halides
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...