Wear and Corrosion

Materials – the basis in materials science and engineering.

The main contents are transmitted at theory classes used expositive techniques, as PowerPoint support, to developing skills through lectures accomplished with discussions. The iterative applications as the exercises resolution are conformed on theoretical-practical lectures. Practical classes, main to developing practical skills, through lectures with individual or group discussions, consist in experimental methods applications with students hand care, that aloud the sedimentation on wear and on corrosion theoretical fundaments and concepts and theoretical-practical bases.

The main objective of this course unit is related with learning outcomes and competences that allowed to understand, measure and control the ways of wear and corrosion phenomena’s in materials as degradation and destructive process of mechanical components and systems.

Upon completion of this unit, others transversal competences are developed, providing that the students should be able to use laboratory techniques and equipments in tribological studies, as well to be able to make reasonable scientific evaluation of related experimental results.

Understand the corrosion principles and common corrosion forms; Be aware of methods used to mitigate and prevent corrosion.

Part I – Wear

Introduction to tribology: significance, origins and objectives; economic impact.

Friction and wear: friction fundamentals; surface effects in tribology – adsorption, surface topography, measurement of surface roughness; friction models; friction values and friction influent parameters; energy dissipation by friction; wear mechanisms; wear laws; wear influent parameters; wear maps.

Materials for tribological applications: tribological and metallurgical compatibility; conventional and novel materials; surface preparation techniques for tribological applications; coatings and surface treatments.

Lubrication and lubricants: lubrication significance and objectives; lubrication regimes; dry or solid lubrication; self lubrication; lubricant types and application; lubricant oils proprieties; viscosity; mineral oils; synthetic oils; lubricant additives; solid lubricants and coatings; gaseous lubricants; greases; transportation and lubricants applications.

Mechanical components for tribological applications: bearings – journal and thrust bearings, plain and rolling bearings; seals – static, dynamic, pseudo-static.

Lubrication systems and components lubrication: plain and rolling bearings lubrication; gears and roller chain lubrication; turbines and motors lubrication.

Tribological tests – equipments and methods; standard tests; applications.

Part II – Corrosion

Introduction to corrosion: definition; classification; corrosive environments; corrosion damage; corrosion costs; corrosion engineering. Electrochemical fundamentals of corrosion: electrochemical reactions; standard electrode potentials; Nernst equation; electrochemical cells.

Corrosion kinetics: corrosion rate units; Fraday’s law; polarisation; passivation; effect of environmental variables on the corrosion rate. Pourbaix diagrams.

Types of corrosion: uniform corrosion; galvanic corrosion; crevice corrosion; pitting corrosion; intergranular corrosion; selective corrosion; erosion corrosion; stress corrosion.

Corrosion prevention: materials selection; modification of environment; design; metallic coatings; non-metallic inorganic coatings; organic coatings; cathodic and anodic protection. High temperature corrosion: high temperature oxidation – protective oxide films, mechanisms of oxidation, oxidation kinetics, resistance of metals to oxidation; other mechanisms of high temperature corrosion.

NAO

Recommended Manuals:

STACHOWIAK, Gwidon W.; BATCHELOR, Andrew W. – Engineering Tribology, 2nd Ed., Butterwort-Heinemann, 2001. ISBN: 0750673044

LUDEMA, K.C. – Friction, Wear, Lubrication: A Textbook in Tribology, CRC Press LLC, 1996. ISBN: 0849326850

FERREIRA, Luís A., – Tribologia. Notas de Curso, Publindústria, Porto, 1998. ISBN: 9729579458

PINA da SILVA, F.A. – Tribologia, Vol. I, Fundação Calouste Gulbenkian, Lisboa, 1985. ISBN: 9723101904

FONTANA, Mars G. – Corrosion Engineering, 3rd Ed., McGraw-Hill, New York, 1986. ISBN: 0071003606

GENTIL, Vicente- Corrosão, 5.ª Ed., LTC – Livros Técnicos e Científicos, Rio de Janeiro, 2007. ISBN: 9788521615569

VALENTE, Artur J.M.; LOBO, Victor M.M.- Corrosão – Fundamentos, Prevenção e Efluentes, ECEMEI, Rio Tinto, 2000. ISBN: 9729486042