Electrochemical Experimental Analysis of Different Coatings

Abstract

Aims: This paper investigates four different metallic coatings of 17-4PH stainless steel and tests them in seawater as a means of preventing seawater corrosion of turbine upper stage blades.. Study Design: The self-corrosion current densities of the different specimens in the synthetic seawater solution were measured using open circuit, polarization curves, and  electrochemical AC impedance spectra. Place and Duration of Study: Department Between July 10, 2023,  and August 10, 2023, the Laboratory of the School of Mechanics, North China University of Water Resources and Hydropower (NUWRH). Methodology: For the working condition of turbine final blades, four different metal coatings based on 17-4PH stainless steel are investigated to simulate the working condition of turbine blades, and electrochemical tests are carried out on the four different specimens in the test solution of synthesized seawater solution. The self-corrosion current densities of the different specimens in the synthetic seawater solution were measured using open circuit, polarization curves, and electrochemical AC impedance spectra. Results: The results show that the AHP-coated 17- 4PH stainless steel specimens have the lowest self-corrosion current density (color) in the synthetic seawater solution. Conclusion: Non-invasive This indicates that the corrosion rate of AHP coatings in synthetic seawater solutions is slower than that of TW-7 coatings, sprayed stainless steels, and other stainless steels in the same conditions.