Manufacturing of Ti-6%Al and Ti-6%Al-4%V Alloys and Their Corrosion in Sodium Chloride Solutions

Abstract

The current research aims at the manufacturing of Ti-6%Al alloy and Ti-6%Al-4%V alloy using the mechanical alloying method and studying their corrosion behavior after various periods of immersions in 3.5% NaCl solutions. The fabricated alloys were also evaluated using spectroscopic techniques such as X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy analyses. The corrosion behavior was studied using potentiodynamic polarization, electrochemical impedance spectroscopy, and chronoamperometric current-time electrochemical methods. It is confirmed that the presence of 4% V greatly decreases the uniform corrosion of the Ti-6%Al alloy as a result of the role of V in decreasing the cathodic, anodic, and corrosion current, and the rate of corrosion along with increasing the corrosion resistance. Increasing the time of immersion to 24 h and further to 48 h highly decreased the corrosion of the alloys. The presence of 4% V and extending the time of exposure thus increase the resistance against corrosion via decreasing the corrosion of Ti-6%Al alloy in the chloride test solution. ; writing-original draft preparation, E.-S.M.S. and H.S.A.; writing-review and editing, E.-S.M.S.; supervision, E.-S.M.S.; project administration, E.-S.M.S.; funding acquisition, E.-S.M.S. All authors have read and agreed to the published version of the manuscript.

Wear and Corrosion Resistance of AlSi10Mg–CP–Ti Metal–Metal Composite Materials Produced by Electro-Sinter-Forging

“…The OCP range was in agreement with data referring to aluminum alloys in the same solution [32], which are generally more anodic compared with the potentials of titanium alloys under the corresponding conditions [33].…”

Influence of Milling Route on the Corrosion Passivation of Al-2%SiC Nanocomposites in Chloride Solutions

“…The corrosion parameters obtained fr polarization curves are tabulated in Table 2. These parameters are the cathodic ( anodic (βc) Tafel slopes, corrosion potential (ECorr), corrosion current density (jC pitting potential (EPit), were obtained as previously reported [22,23,25,26]. The co resistance (RP) and corrosion rate (RCorr) were respectively calculated according to lowing equations [25][26][27]:…”

“…The corrosion parameters obtained from the polarization curves are tabulated in Table 2. These parameters are the cathodic (β c ) and anodic (β c ) Tafel slopes, corrosion potential (E Corr ), corrosion current density (j Corr ), and pitting potential (E Pit ), were obtained as previously reported [22,23,25,26]. The corrosion resistance (R P ) and corrosion rate (R Corr ) were respectively calculated according to the following equations [25][26][27]: Here, k is a constant (to define the unit for RCorr, k = 3272 mm (amp −1 cm −1 year −1 )), EW is the equivalent weight (EW = 9 g equivalent), d is the density (d = 2.7 gm cm −3 ), and A is the area of the surface (A = 1 cm 2 ).…”

“…The inner layer is dominating impedance at high frequency area, while the outer layer (porous layer) is dominating at low frequency range [32,33]. Further, Q (with its "n" value is circa 1) is considered as double layer capacitors, which gives a confirmation that the outer layer has some porosities and is dominating the impedance at the low-frequency region [20,26]. In addition, the presence of a C dl reveals that prolonging ball milling time enhances the passivation of the surface against corrosion in the chloride solutions.…”

“…This behavior is due to the dissolution of Al that is in the nanocomposite according to the aforementioned reaction (Equation ( 6)). The continuous increase of current for the first nanocomposite is due to the occurrence of pitting corrosion as a result of the attack of the chloride solution towards the surface of the nanocomposite and the formation of aluminum chloride complex, AlCl4 − , which diffuses into the balk solution [17,25,26,[34][35][36][37][38][39]:…”