Corrosion Inhibitors

Code

Course teacher

Associate teachers

Status of the course

Course objectives

Gaining knowledge necessary for the proper selection of corrosion inhibitors, depending on materials, environment, and other conditions of use and to evaluate its effectiveness.

Course enrolment requirements and entry competences required for the course

Learning outcomes expected at the level of the course (4 to 10 learning outcomes)

After the successfully passed exam student is able to:
- define corrosion inhibitors
- identify factors that affect the inhibitory properties of particular compounds
- properly select corrosion inhibitor, depending on materials conditions of use
- explain the corrosion inhibition mechanism
- determine the corrosion inhibition effectiveness
- evaluate the ecological impact of corrosion inhibitors.

Course content broken down in detail by weekly class schedule (syllabus)

1st week: Introduction. Historical overview of corrosion inhibition. Electrochemical double layer and zero charge potential.
2nd week: Effect of inhibitors on kinetics of electrochemical reactions. Adsorption processes. Effect of the chemical structure of organic compounds on their protective properties.
3rd week: Role of the medium composition in metals protection from corrosion. Effect of pH.
4th week: Inhibition in acid solutions. Problems in selecting inhibitors for acid media.
5th week: Inhibition in neutral solutions. Inorganic inhibitors. Organic inhibitors. Chelating agents as corrosion inhibitors in neutral solutions.
6th week: Inhibition of localized corrosion.
7th week: First test. Mechanism of corrosion inhibition.
8th week: Hard and soft acids and bases interaction (HSAB principle). HSAB concept in corrosion inhibition. Application of HSAB principle to specific adsorption at electrode.
9th week: Hammett equation. Application of Hammett equation in corrosion inhibition.
10th week: The Hansch model. Hansch model in corrosion inhibition. Free and Wilson correaltions.
11th week: Inhibitors for atmospheric corrosion. Inhibitors for temporary protection. Vapor phase corrosion inhibitors.
12th week: Determination of inhibitor efficiency using electrochemical and non-electrochemical techniques.
13th week: Real problems in inhibition of corrosion. Possibilities for improving inhibitors effectiveness.
14th week: Environmental friendly inhibitors. Inhibitors toxicity. Possibility of replacement of toxic inhibitors with new environmental friendly.
15th week: Second test.
Exercises:
Inhibition of pitting corrosion of Al by NaNO2. Determination of thermodynamic properties in the adsorption of p-hydroxybenzoic acid on Cu. Influence of thiourea on iron corrosion in acidic solution. Influence of thermal and mechanical treatment of the materials on its corrosion resistance. Corrosion inhibition of steel by caffeine. Study of zinc corrosion inhibition using the Mylins method.

Format of instruction:

Student responsibilities

Lecture attendance: 80 %. Laboratory exercises attendance: 100 %.