Rezumat
The corrosion behavior of welded maraging steel in sulfuric acid solutions has been studied over a range of acid concentrations and solution temperatures by electrochemical techniques such as Tafel extrapolation and electrochemical impedance spectroscopy. The studies have revealed that the corro- sion rate of welded maraging steel increases with the increase in temperature and increase in concen- tration of sulfuric acid in the medium. The thermodynamic parameters such as activation energy, en- thalpy of activation and entropy of activation for the corrosion process are calculated. The results ob- tained through the two techniques are in good agreement. The surface morphology and surface com- position of the corroded samples have been examined by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis, respectively.
Keywords: maraging steel, EIS, polarization, SEM, EDX.
УДК 541.138