| Abstract [eng] |
The article discusses the knowledge of students in metal corrosion. Usually, resistance of metals against corrosion is determined by the values of the standard electromotive force (EMF) of the metals determined versus the standard hydrogen electrode (SHE). However, the standard conditions differ from the real-world conditions under which metal corrosion occurs, so the standard EMF cannot be accepted as an absolute indication of metal's resistance to corrosion. This difference is due to many environmental factors (e.g., temperature, pH, pressure, concentrations of hydrogen and oxygen in the environment etc.); thus, the value of metal potential is affected. Therefore, the authors have suggested using stationary (corrosion) potentials of metals and galvanic series instead of the standard EMF in the education process. In the article, the authors present a comparison of metal activity series based on standard EMF and galvanic series. The advantage of the galvanic series offered to students studying corrosion is illustrated by the problematic tasks for light metals (Ti, Mg, and Al) and corrosion galvanic cells. Based on the presented values of the metal potentials in the galvanic series, students were able to correctly choose the type of metal coating, they can calculate the EMF values of the corrosion process more accurate and verify them experimentally during the laboratory session. |
