| Abstract [eng] |
In natural environmental conditions the mitosporic fungi having accessed to the steel and aluminium surfaces contaminated with organics start developing, excluding metabolites. Thus they involve into the metal surface corrosion processes and attach electrodes from their base. The course of corrosion changes. The study was carried out with 5 species of mitosporic fungi (Chrysosposrium merdarium, Penicillium cyclopium, Arthrinium phaeospermum, Cladosporium herbarum, Aspergillus niger) excluded from the steel and Al samples exposed for a long time (up to 2 years) in natural open-air conditions. In model conditions the ability of the above-mentioned species of microorganisms to contaminate and develop on the surface of steel and Al was established, metabolites that were excluded by each species of mitosporic fungi when developing in close contact with steel and Al were identified, changes of metals caused by metabolites excluded by microorganisms of the studied species were established. In order to evaluate the changes of metal corrosion after the contact with the growing different mitosporic fungi the criterion of polarized resistance was chosen. In the conditions of the studies the mitosporic fungi Arthrinium phaeospermum, Aspergillus niger, Chrysosposrium merdarium were most active on the steel and Al surfaces. It should be emphasized that this effect depended on the peculiarities of metal surface, contamination level and ability of microorganisms to develop in extreme conditions formed on metal surface. Established the changes in the surfaces of steel covered with zinc polymeric coating after 2 years of exposure on the shore of the Baltic sea (Neringa, Preila), in village (Molėtai, kulionys), the suburb of city (Vilnius, Visoriai). Isolated mitosporic fungi, with take part in these processes. |
