Volumen 57 (2013): Heft 3 (September 2013)

The study presents a newly developed methodology of polarization curves scanning in a thin layer of electrolyte. The use of scanned curves as the input data for simulation of galvanic corrosion is shown in a programme that works with the assumption of a thin layer of electrolyte. The theoretical part briefly describes the physical model of the programme. It presents scanned electrochemical corrosion properties of selected basic technical materials in two types of electrolyte and introduces the outputs of simulation of a simple construction joint corrosion. The practical use of the programme and essential improvements of the methodology of scanning in thin layers of electrolyte are discussed.

Through their metabolic activities microorganisms produce a large variety of products that may contribute to corrosion of different materials, including metals. The goal of this work was to monitor selected factors important in terms of corrosion or bio-corrosion, namely location, soil and the presence of water in four parts of the transit gas line passing through Slovakia, and subsequently to identify the level of risk of bio-corrosion. The analysis results from monitored locations indicated that in terms of bio-corrosion, the highest risk was in Zemplínské Hradiště 1 and Slivník trenches located in Eastern Slovakia and in Tomášová 1, 2 and 3 trenches located in the south of Slovakia.

For corrosion of metals, soils represent the most complex environment. Corrosion of metals in soil can vary from fairly rapid dissolution to negligible impact. A case study from experience and the published literature illustrates factors which resulted in microbiologically influenced corrosion (MIC) of stainless steel.