Chemical Engineering

Effects and costs of corrosion. General principles of dry and aqueous corrosion: chemical and electrochemical reactions, definitions and expressions of corrosion rate and corrosion current, Faraday’s law. Thermodynamics of aqueous corrosion processes: electrode potential, electrochemical series, potential-pH Pourbaix diagrams. Kinetics of aqueous corrosion processes: polarization. Evans diagrams. Concentration and activation polarization. Passivity. Forms of corrosion: Uniform Corrosion in Acidic and Aerated Solutions; Galvanic corrosion; Differential aeration and Crevice corrosion; Pitting corrosion, Selective corrosion of alloys, Integranular corrosion and exfoliation; Mechano-chemical corrosion: Erosion, Cavitation, Fretting, Stress corrosion cracking, Fatigue corrosion, Hydrogen -induced corrosion; Stray current corrosion. Corrosion environments: water, soil, atmosphere, concrete. Corrosion in petrochemical plants. Corrosion Monitoring and Inspections. Non-destructive tests. Prevention of corrosion by design. Protection: Coatings, Inhibitors, Electrical protection (Cathodic and Anodic) High temperature corrosion.

No specific prerequisites are formally indicated for the course. However, the knowledge of fundamentals of metallic materials science and engineering represents a necessary basis for the acquisition of competences on corrosion and protection of materials: crystalline structure, defects, microstructure and mechanical properties of engineering alloys (steel, copper, titanium, nickel, aluminum-base alloys) and relative working, machining and thermal treatments. Physico-chemical knowledge of thermodynamics and kinetics of chemical and electrochemical reactions is also considered an important precondition. Useful can be the knowledge of extractive metallurgy and metallurgical processes.

- P.Pedeferri, "Corrosion Science and Engineering", Springer 2018 ISBN 978-3-319-97624-2, ISBN 978-3-319-97625-9 (eBook) - Teacher's notes from the lectures.

The activities are organized in: - face-to-face lectures (for the acquisition of knowledge) - discussion of case studies (for the acquisition of the capability of applying the knowledge and understanding for recognizing corrosion forma and identifying remedies and proposals for corrosion prevention/protection)

The attendance to the lectures, though encouraged, is not mandatory. However, in case of autonomous preparation for the final interview, students are strongly recommended to seek for previous contact with the teacher, in order to be given important directions on the general sense of the course and on specific critical aspects.

The assessment will be based on the results of an oral interview, aimed at verifying the acquisition of the following knowledge and skills: - Knowledge of the physico-chemical mechanisms of corrosion. - Ability of identify the main causes and forms of corrosion of metals in contact with various aggressive environments. - Correct identification of the most suitable diagnostic tools and of the potential preventative measures and protection systems, with special reference to the field of chemical industry. - Ability to communicate the acquired knowledge and to illustrate the proposed technical solutions with clear expression and convincing attitude. During the course students are offered the opportunity to test their preparation by conducting self-assessment written tests (multi-choice questions, solution of numerical problems, essay questions), followed by common correction and, for those who request it, an evaluation of the test. For the final vote the following aspects will be considered: - the level of knowledge - the ability to securely correlate different topics - the ability of applying knowledge to the solution of problems of limited complexity in the field of materials engineering - the ability to communicate the acquired knowledge and to illustrate the technical solutions proposed with clarity using a proper technical vocabulary. To obtain the highest marks (30/30 cum laude), the student must demonstrate that he/she has acquired excellent knowledge of all the topics covered in the course, and that he/she can apply this knowledge to the solution of problems in the field of industrial engineering, proposing original solutions and showing the results of an autonomous extension of knowledge.

The activities are organized in: - face-to-face lectures (for the acquisition of knowledge) - discussion of case studies (for the acquisition of the capability of applying the knowledge and understanding for recognizing corrosion forma and identifying remedies and proposals for corrosion prevention/protection)