PROCESSES AND COATINGS OF METAL ALLOYS
Academic year and teacher
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- Versione italiana
- Academic year
- 2017/2018
- Teacher
- GIAN LUCA GARAGNANI
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/21
Training objectives
- The aim of the course is to give knowledge regarding the choice of the most suitable surface treatment and finishing of metallic materials for a specific industrial application. The science of surface treatment and finishing is as wide as materials science, and in addition, the function of either a treatment or a coating depends not only on its nature but also on the nature of the substrate and of the interface between the substrate and the surface. In fact, the mechanical properties of a metallic material depend on its chemical composition and its microstructural features, but its operation behavior is influenced by its surface properties. The surface of a metallic component is the medium of interaction with the environment, and during its operational life, it changes physical, chemical and mechanical characteristics. Interactions with the environment can rapidly lead to a deterioration of surface properties because of either corrosion processes, related to the presence of specific chemical agents, or wear phenomena, caused by mechanical interplays. In the majority of situations, an interdisciplinary combination of various competences is necessary to design the proper solution to corrosion and wear situations. In the light of these aspects, it is necessary to grow mechanical engineers with highly developed metallurgical skills, since the industry of surface treatments and coatings is a leading productive branch within the industrial production frame.
At the end of the course, the student will be able to understand the nature and the causes of surface deterioration phenomena and to identify the most suitable solutions to properly transform surface properties in order to solve or restrain either corrosion or wear problems. The student will have to choose between the studied techniques and processes and to evaluate the influence that process variables and productions defects would have on the metallurgical features of the desired surface. Prerequisites
- The student must have a base knowledge of metal science and metallurgy and of microstructural properties of metallic alloys. Also a basic knowledge of metallographic techniques to properly prepare and investigate metallic specimens.
Course programme
- Magnesium and its alloys. Innovation in surface treating of Mg alloys (7.5 hours)
Non Destructive Methods (2,5 hours)
Tribology and lubrication. Friction and wear mechanisms. Adesive, abrasive, fatigue, fretting wear. Archard law. Tribological test. Tribological phenomema in industrial applications (15 hours).
Tribological problems in human body (2,5 hours)
Surface treatments: microstructural modification treatments, surface conversion treatments, mechanical surface treatments, thermochemical treatments, deposition of thick coatings, chemical and physical deposition of thin coatings (25 hours)
Hot and cold zinc coating(2,5 hours)
Powder metallurgy (2.5 hours)
Additive manufacturing (2.5 hours) Didactic methods
- Theoretical lessons, Industry visits.
Learning assessment procedures
- Oral examination. The student will be able to describe the tribological phenomena and mechanisms. He will be able to choose the best surface treatments for specific industrial applications.
Reference texts
- - Slide of the teacher.
- AA.VV: Manuale di trattamenti e finiture (2003), Tecniche Nuove.
- G. Straffelini (2005), Attrito e usura, Tecniche Nuove (MI) (Capitolo 7: Ingegneria delle superfici in tribologia).
- K.Holmberg, A.Matthews (2009), Coatings Tribology: Properties, Mechanisms, Techniques and Applications in Surface Engineering, Elsevier (Chapter 2: Deposition processes and coating structures).
- ASM Handbook (Vol. 5) Surface Engineering.
