PHISICOCHEMICAL ASPECTS OF MICROORGANISMS INTERACTION WITH PASSIVE FILMS ON THE ALLOYS

摘要

It is known that the electrochemical behavior of active-passive alloy is defined by properties of surface passive films. Therefore the research of a chemical composition, electrochemical and electrophysical properties of passive films is an essential part of studying materials corrosion behavior in different environments. The aim of our work is to study the influence of biochemical activity of microorganisms on change of composition, structure, physical and chemical properties of passive films on the metal surface. Strain Pseudomonas sp. isolated with corroding metal surfaces in tropical seawater has been chosen as a test object. Research was spent on samples of stainless steel, titanium alloy, nickel and chromium. In this study the combined approach in apply of surface science and electrochemical methods were used. Thanks to a combination of the data received by different methods, relationship between chemical composition and semiconductor properties of passive films and activity of microorganisms has been established.