Corrosion behavior of as-forged and SLMed TC4 alloys in 3.5wt.％NaCl solution
The electrochemical impedance spectroscopy(EIS),potentiodynamic polarization curves(PDP),and localized electrochemical impedance spectroscopy(LEIS)were utilized to investigate the electrochemical behavior of as-forged and selective laser-melted(SLMed)TC4 alloys in 3.5wt.％NaCl solution.Additionally,Mott-Schottky test and X-ray photoe-lectron spectroscopy(XPS)were employed to analyze the properties of the passive films formed on the surface of the alloys.The results indicated that the as-forged TC4 alloy possessed an α+β dual-phase structure,whereas the SLMed TC4 alloy was mainly composed of acicular α'martensite.Compared to the SLMed TC4 alloy,the as-forged TC4 alloy exhibited a higher polarization resistance,a lower corrosion current density,and a thicker passive film.The passive films on both al-loys were found to be n-type semiconductors,but the as-forged alloy had a lower carrier density.The content of TiO2 in pas-sive film was also higher,indicating that the corrosion resistance property of the as-forged TC4 alloy was better than that of SLMed TC4 alloy.
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