Effect of Lateral Laser-Cladding Process on the Corrosion Performance of Inconel 625

This study aimed to evaluate the corrosion properties of different samples coated by the laser-cladding method to find the optimal laser parameters. Thereby, potentiodynamic polarization (Tafel) and electrochemical impedance tests were performed to assess the corrosion resistance of coated samples. Consequently, the corrosion morphology of tested samples was inspected by scanning electron microscopy. The results demonstrated that the laser power directly correlates with pitting corrosion and defects on the surface of the samples. Moreover, when molybdenum and chromium ions are increased in the electrolyte solution, the passive and protective layers are more durable, as the ions are sited within the holes and defects, reducing the surface corrosion rate.

Automated summary

The aim of this study was to evaluate the corrosion properties of different samples coated by the laser-cladding method and find the optimal laser parameters. Potentiodynamic polarization (Tafel) and electrochemical impedance tests were performed to assess the corrosion resistance. Scanning electron microscopy was used to inspect the corrosion morphology of the tested samples. The results showed a direct correlation between laser power and pitting corrosion on the surface of the samples. Additionally, an increase in molybdenum and chromium ions in the electrolyte solution led to more durable passive and protective layers, as the ions filled the holes and defects, reducing the surface corrosion rate.