Steel constructions are an integral part of our lives, surrounding us almost everywhere. They are used for erection of various halls, bridge structures, railings etc. Each steelwork is more or less impaired by corrosion, respectively a certain level of corrosion aggressiveness of the environment. Corrosion is the cause of material degradation - referred to rusting. In order to avoid this unwanted phenomenon to the maximum extent possible, we use various methods and technologies protecting the relevant material and preventing from corrosion occurrence and development. This article deals with one of the methods aimed at corrosion protection of structural steelwork - duplex coating system that is assured by means of hot dip galvanizing followed by paint system application.

This contribution solves the character of corrosive damage of the tubes, steam generating tubes of dry-bottom boiler combustion chamber in power plant engineering, and deals with the aspects related to the corrosion criteria of the carbon steel. The laboratory test results of samples applied on tubes that were subject to non-destructive and destructive tests are analyzed in one part of the work. The samples of greater incidence of corrosion products, which caused the failure of the integrity of the steam generating tubes, were tested. The work deals in details with the results of laboratory and chemical analysis of boiler water from the previous periods. The thesis evaluates the amount and frequency of P2O5 dosing cycles. The work also deals with the proposal of corrective measures that shall lead to the chemical balance of the boiler water. It proposes a continuous correlation methodology for chemical stabilization.

Water-based coating systems are becoming increasingly popular among consumers due to their simple application and a wide range of colours. A common mistake made by users of these coating systems is neglecting of diagnostics of the corrosive environment and failing to eliminate the factors that cause corrosion aggressiveness. On the boundary of two different environments there can be corrosion products developed and dust particles deposited, which may cause, under certain circumstances, development of deeply hidden corrosion, and thus reduce the level of protection of the substrate. In order to provide long-term protection of the substrate the coating system must be able to eliminate the corrosion agents effectively. In addition to the requirements for aesthetic value set by the consumers, also environmental aspects must be taken into account in the long-term protection of the substrate.

The preservation ability of coatings applied to the materials of steel products, steel structures, etc., for short-term corrosion protection is a very delicate and modern theme. In cooperation with the project Pre-seed, we can pay closer attention to activities involved with this topic. The project Pre-seed at the Technical University of Ostrava, which is part of the Operational Programme of Research and Development for Innovation, attempts to support the preparation of the commercialization of promising technologies and inventions with high application potential that were developed at the Technical University of Ostrava. This paper focuses on the short-term corrosion protection of steel products, steel structures, and engineering products using thin nanocoatings. This experimental work is primarily concerned with the production and development of samples that demonstrate the innovativeness and functionality of the issue. Furthermore, the project addresses important factors affecting the quality and durability of the coating system. The results of the experimental part show us some very interesting outputs that need to be further studied and developed.