Alloy modifying is common practice for improving the structure of the material. One of often used material, where the modification is used is AlSi7Mg0.3 alloy. And modification of AlSi7Mg0.3 is often realized by strontium. The paper deals with an experiment that was realized at the Faculty of Production Technology and Management of Jan Evangelista Purkyně University in Ústí nad Labem, which dealt with the effect of modifications by strontium on the structure of AlSi7Mg0.3. In frame of its experiment were analyzed metallographic samples and were observed structures of unmodified and modified material on the microscope. Was evaluated result of modification on the structure.

Piping systems of boilers are mainly exposed by high temperatures, pressures and corrosive loads. This corresponds to the choice of materials boiler pipeline. These materials are in most cases special stainless steel for energetic equipment. Article deals with the evaluation of the resulting degradation of thermally stressed pipe boiler, which occurred after the increase boiler capacity. Degradation showed an increased amount of corrosion products on the inner surface of the pipeline, which resulted in clogging of pipes, formation of cracks and leakage of steam. Complex analysis was carried out of corrosion products and material microstructure pipelines. The result was that occurred to intergranular corrosion of pipelines in loaded state. On the basis of this was carried out analysis of the material in the unloaded state. Chemical composition and microstructure correspond to prescribed standards and requirements. Test of resistance to intergranular corrosion revealed that in the steel causing damage to the cohesion of the material along grain boundaries. It is for this type of material inadmissible. Therefore it is necessary in the case of increasing the performance of the boiler and thus the increase in temperature and pressure, to ensure a higher resistance to intergranular corrosion of the material.

The purpose of using modern technology is to reduce costs, facilitate the work and simplify as far as the most comprehensive set of operations. One of many modern technological processes involved in the refining of materials are technologies of surface hardening using a laser beam. This method can harden precisely defined areas with minimal thermal influence of surrounding areas it is possible to achieve less residual stress and less distortion of components compared the volumetric hardening, it is also possible to use controlled robotic units and all for the absence of cooling, which proceeds spontaneously to the surrounding material itself and atmosphere. These advantages of laser surface hardening are used by companies for which the prospect of minor damage to the material, increase of the material durability, material stiffness ensuring etc. is initiation for the use of modern technology.

Al-Cu-Mg based alloys are often used in the automotive industry. There are characterized by high strength characteristics but poor corrosion resistance, which appears to be problematic in this sector. The manufactured blanks of these alloys may be protected by some of the barrier protection methods, including cladding. Semifinished products made of these methods can be protected against corrosion by a thin layer of aluminium oxidescalled clad Durals. The surface layer creates a stable and durable Al2O3 layer, which provides corrosion resistance, which leads to an extended service life of the piece. However, this type of protection is adversely affected by the effect of copper diffusion, which is dependent on the heat treatment mode of the alloy. Temperature and temperature hold are the main factors influencing the diffusion process. In the solution annealing of aluminium alloys, the temperature is in the range of (470-500) ° C, resulting in intense diffusion processes at the inter phases interfacial. The paper deals with the analysis of the influence of the heat treatment regime on the corrosion resistance of Al2024 alloy sheets (AlCu4Mg1 type alloy) provided with an Al1050 alloy clad coating on both sides in a corrosive salt mist environment in accordance with EN ISO 9227, which is supposed to have a positive effect on extending the service life of a car component.

Abstract. The individual construction elements are exposed to varying forms of loading, which correspond to the symptoms of degradation. In the analysis of degradation it is necessary to choose an approach that will lead to determine the actual causes of its origin. For determining the causes of degradation of objects currently wide variety of methods and equipment are available. It is necessary often to have in mind the economic viewpoint of the used method of analysis. It follows effort to create an approach for the educational process that passes information to students about choosing the methodologies and equipment. The present paper theoretically and practically introduces the possibility of a comprehensive approach that gives students the skills to detect the causes of degradation in selected parts of the energy equipment. This is an approach and examples for students studying technical fields. Students can apply this information during their studies in solving practical problems in the subjects such as Materials Science, Wear, Degradation of Metal Materials.