Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 2, Pages 1162-1174Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2019.11.044
Keywords
Ti-6Al-4V alloy; Surface roughness; Polarization; Electrochemical impedance; spectroscopy; Pitting corrosion
Funding
- Tubular Goods Research Institute of CNPC, in Xi'an, Shanxi, China
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
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This study experimentally investigated the electrochemical corrosion and pitting corrosion of Ti-6Al-4 V alloy samples with different roughness in 12 wt.% HCl solution at 35 degrees C. The corrosion behavior of these alloy samples was studied by potentiostatic and potentiodynamic polarization. Both the corrosion rate and pitting sensitivity of the sample increased with increasing surface roughness. Moreover, the effect of surface roughness on the corrosion of Ti-6Al-4 V alloy could be characterized by the aspect ratio (w/d) of the peak-valley morphology on the surface, where w and d are the width of the valley and relative depth of the peak. The w/d and true surface areas influenced the pitting corrosion of the alloy. Polishing the surface of the Ti-6Al-4 V alloy can enhance the corrosion resistance of the working surface, rendering the material suitable for use in the oil and gas industries. (C) 2019 Published by Elsevier B.V.
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