Susceptibility to Pitting Corrosion of Ti-CP2, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-4V Alloys for Aeronautical Applications

Titanium alloys are used in different industries like biomedical, aerospace, aeronautic, chemical, and naval. Those industries have high requirements with few damage tolerances. Therefore, they are necessary to use materials that present fatigue, mechanical, and corrosion resistance. Although Ti-all...

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Bibliographic Details
Published in:Metals (Basel ) 2021-07, Vol.11 (7), p.1002
Main Authors: Jaquez-Muñoz, Jesus, Gaona-Tiburcio, Citlalli, Lira-Martinez, Alejandro, Zambrano-Robledo, Patricia, Maldonado-Bandala, Erick, Samaniego-Gamez, Oliver, Nieves-Mendoza, Demetrio, Olguin-Coca, Javier, Estupiñan-Lopez, Francisco, Almeraya-Calderon, Facundo
Format: Article
Language:English
Subjects:
Aeronautics
Aerospace industry
Aircraft
Biomedical materials
corrosion
Corrosion fatigue
Corrosion potential
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Damage tolerance
Electrochemical noise
Electrode polarization
Electrolytes
Exposure
Hydrogen
Noise
Pitting (corrosion)
potentiodynamic polarization
Power spectral density
PSD
Room temperature
Sodium chloride
Sulfuric acid
titanium
Titanium alloys
Titanium base alloys
Tolerances
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Summary:Titanium alloys are used in different industries like biomedical, aerospace, aeronautic, chemical, and naval. Those industries have high requirements with few damage tolerances. Therefore, they are necessary to use materials that present fatigue, mechanical, and corrosion resistance. Although Ti-alloys are material with high performance, they are exposed to corrosion in marine and industrial environments. This research shows the corrosion behavior of three titanium alloys, specifically Ti CP2, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-4V. Alloys were exposed on two electrolytes to a 3.5 wt % H2SO4 and NaCl solutions at room temperature using cyclic potentiodynamic polarization (CPP) and electrochemical noise (EN) according to ASTM G61 and ASTM G199 standards. CPP technique was employed to obtain electrochemical parameters as the passivation range (PR), corrosion type, passive layer persistence, corrosion potential (Ecorr), and corrosion rate. EN was analyzed by power spectral density (PSD) in voltage. Results obtained revealed pseudopassivation in CPP and PSD exposed on NaCl for Ti-6Al-2Sn-4Zr-2Mo, indicating instability and corrosion rate lower. However, Ti-6Al-4V presented the highest corrosion rate in both electrolytes. Ti-6Al-2Sn-4Zr-2Mo revealed pseudopassivation in CPP and PSD in NaCl, indicating a passive layer unstable. However, the corrosion rate was lower in both solutions.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11071002