Corrosion behavior of an in situ consolidated nanocrystalline Al-V alloy

Abstract

Supersaturated solid solutions of Al and corrosion-resistant alloying elements (M: V, Mo, Cr, Ti, Nb), produced by non-equilibrium processing techniques, have been reported to exhibit high corrosion resistance and strength. The corrosion mechanism for such improved corrosion performance has not been well understood. We present a fundamental understanding of the role of V in corrosion of an Al-V alloy, which will provide a theoretical background for developing corrosion-resistant Al alloys. High-energy ball milling of the elemental powder of Al and V produced an in situ consolidated Al-V alloy, which exhibited high solid solubility of V. The corrosion resistance of Al-V alloy was significantly higher than that of pure Al, which was attributed to the (1) enrichment of V at the passive film/substrate interface, (2) incorporation of V into the passive film, and (3) deposition of V on the iron-containing cathodic particles and therefore, retardation of cathodic reaction.

A Critical Review on Al-Co Alloys: Fabrication Routes, Microstructural Evolution and Properties

“…Aluminium and its alloys are of interest due to their light weight, high specific strength and high stiffness. Among them, those containing transition metals have attracted a lot of attention over the last years including Al-Cr [1,2], Al-V [3][4][5], Al-Ti [6] and Al-Ni [7][8][9][10] alloys due to their hardness and corrosion resistance. Moreover, combining transition metal additions with non-equilibrium fabrication conditions enables to significantly enhance the hardness and corrosion resistance, leading to improved properties compared to commercial Al alloys [11].…”

Influence of vanadium addition on corrosion behavior of high‐energy ball milled aluminum alloy 2024

“…The proposed mechanisms resulting from the extended solid solubilities are attributed to the incorporation of alloying elements in the passive film, formation of the solute-rich layer beneath the passive film, increased propensity for re-passivation, the release of compounds such as molybdates and vanadates, and reduced galvanic activity between the matrix and secondary phases. [12,13] Corrosion studies on binary Al alloys have shown that V provides an excellent combination of strength and corrosion resistance, so further research has been carried out to investigate the role of vanadium in Al alloys. [12][13][14][15] Most of the work has focused on binary alloys to characterize the influence of alloying elements on corrosion behavior.…”

“…[12,13] Corrosion studies on binary Al alloys have shown that V provides an excellent combination of strength and corrosion resistance, so further research has been carried out to investigate the role of vanadium in Al alloys. [12][13][14][15] Most of the work has focused on binary alloys to characterize the influence of alloying elements on corrosion behavior. However, complex alloy systems are expected to demonstrate dissimilar properties.…”

“…[20][21][22] V as an alloying element is found in AA2219 only in very small amounts (0.05-0.15 wt.%) and is considered less effective than zirconium and titanium as grain refining elements. [3,23] On the other hand, several studies [12][13][14]24,25] have reported success in producing corrosion-resistant Al alloys with high solid solubility of V. Ability of V in suppressing the cathodic activity of Ferich and C-rich particles was attributed to enhanced corrosion resistance. [13,26] C was introduced from the process controlling agent whereas Fe-rich particles were a result of abrasion of milling media.…”

“…[3,23] On the other hand, several studies [12][13][14]24,25] have reported success in producing corrosion-resistant Al alloys with high solid solubility of V. Ability of V in suppressing the cathodic activity of Ferich and C-rich particles was attributed to enhanced corrosion resistance. [13,26] C was introduced from the process controlling agent whereas Fe-rich particles were a result of abrasion of milling media. [13,26] Therefore, HEBM of AA2024 alloy with V addition is promising to enhance the corrosion resistance.…”