In this second part another group of processes of surface treatment of materials in which has been employed a series of principles of the Physics are reviewed. Using technologies that employ these principles it is possible to modify the surface of materials in order to obtain improvements in their behavior, specially in regard to increasing their corrosion, wear or fatigue resistance. In particular, this work describes the processes of flame and induction hardening, surface treatments using laser beam, treatments that use concentrated solar energy and finally the processes of physical vapor deposition. All of them of industrial application, with the exception of the use of concentrated solar energy which, however, has an important potential due to the current situation of the renewable energies.

The objective of these two works is to show how a series of principles and concepts of Physics are applied (which are taught in the areas of Basic Sciences in Engineering careers), in various processes that are used to modify the surface of materials and thus provide them with improved properties particularly related to wear, fatigue and corrosion resistance, with the purpose that engineering students have greater evidence of practical applications and, therefore, of the importance of Physics for development of these technologies. As an example, in this first article, the Thermal Spray processes are presented and it is shown how Physics concepts are applied and have a prominent role both in the design and in the construction of the equipment with which they are made, as well as in the own generation of surface treatments. This is intended to give a sample and evidence the usefulness of Physics in this type of process to both students and teachers.