Characteristics and corrosion behavior of Ti–30Nb–5Sn alloys in histidine solution with various NaCl concentrations

• E.P. Utomo, S. Herbirowo, V. Puspasari and Y.N. Thaha

Research Center for Metallurgy and Materials, Indonesian Institute of Sciences, Gedung 470, 15314, South Tangerang, Banten, Indonesia

Abstract: The electrochemical studies of the Ti–30Nb–5Sn arc vacuum furnace’s corrosion behaviour were performed in histidine solution, and the effect of NaCl addition on the corrosion behaviour of Ti–30Nb–5Sn in histidine was investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, as well as Bode phase angle plot. Meanwhile, the microstructure and mechanical properties of Ti–30Nb–5Sn were examined before and after homogenization with micro-Vickers as well as optical microscopy. X-Ray Diffraction test was also conducted to characterize the phase contained before and after the homogenization of Ti–30Nb–5Sn alloys. Based on this analysis, the heat treatment at 1000°C for 5 h was discovered to increase the hardness properties of 346.7 HV and the respective beta phase transformation along the alloys’ grain boundaries. Consequently, the corrosion potential in heat-treated alloys was increased by 0.14% histidine +0.12% NaCl, compared to 0.14% histidine + 3% NaCl –442.0 mV, hitting E_corr –385.0 mV. In addition, the highest corrosion rate was observed in the samples within 0.14% histidine + 3% NaCl of 15.53·10^–3 mmpy. Therefore, the presence of histidine contributed to a higher level of corrosion potential and the addition of NaCl into the histidine solution increased the corrosion rate of Ti–30Nb–5Sn.

Keywords: Ti–30Nb–5Sn, histidine solution, homogenization treatment, corrosion rate

Int. J. Corros. Scale Inhib., 2021, 10, no. 2, 592-601 PDF (594 K)
doi: 10.17675/2305-6894-2021-10-2-7

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