Initial Corrosion Processes and Mechanism of 23Co14Ni12Cr3Mo Ultra-high Strength Steel in Salt Spray Environment

摘要

The initial corrosion processes and mechanism of 23Co14Ni12Cr3Mo Ultra-high Strength steel wereresearched by using salt spray test (SST) and electrochemical methods. The corrosion morphologieswere observed by optical microscope, scan electron microscope (SEM), and atomic force microscopy(AFM). And the corrosion products were characterized by energy dispersive spectrometer (EDS), x- ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and x-ray photoelectronspectroscopy (XPS).The results showed that the corrosion happens from pits and forms two layers for96h. The corrosion products continuously transform from staked granular to acicular, and finally tosintered. The oxides of Fe are transformed in the form of Fe ion to -FeOOH, to -FeOOH or Fe2O3,and finally to Fe3O4.The corrosion mechanism and the corrosion growth model were also studiedcombined the morphology results, corrosion product analysis and electrochemical results.