Corrosion behavior of ultra-fine grained industrial pure Al fabricated by ECAP

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

“…The reduced corrosion depth after ECAP was already indicated by several authors [11][12][13][14][15]17]. Contrary results were reported for Al-Ni and Al-Cu alloys containing other second phases [6].…”

“…The authors suggested a higher oxide formation rate based on the enhanced grain boundary fraction and dislocation density in the UFG materials. Similarly, Song et al [15] stated that strain-induced crystalline defects provide more nucleation sites for the formation of a denser and thicker oxide film. Akiyama et al [6] found an increasing pitting potential of Ni and Cu containing aluminum alloys due to ECAP processing.…”

“…Constituent particles in multi-phase materials mostly act as cathodic inhomogeneity performing a key role in pit initiation and propagation. With an increasing number of ECAP passes, the pitting potential of a variety of multi-phase aluminum alloys, which were reported to increase [11,12,15], decrease [16] or stay unaffected [17]. Correspondingly, for AA 5052, after four ECAP passes, the pitting potential was distinctly shifted to more positive potentials [12].…”

Microhardness and corrosion properties of hypoeutectic Al–7Si alloy processed by high-pressure torsion

“…There have been a number of studies on the effect of grain refinement on the corrosion performance of aluminum alloys [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], but there is little consensus whether SPD techniques can improve the corrosion performance of aluminum alloys. Moreover, most interest has been focused on the use of equal-channel angular pressing (ECAP) for studies of the effect of grain refinement on the corrosion resistance of pure Al [18][19][20][21][22][23] and its alloys AA2024 [24][25][26], AA6082 [27], Al-Si alloys [28][29][30]. For example, Akiyama et al [18] reported that ECAP resulted in deterioration of corrosion resistance of pure Al in a neutral buffer solution containing 0.002 mol L À1 chloride ion, while other research groups [19][20][21] observed that grain refinement with ECAP improved corrosion resistance of pure Al in chloride-containing solutions.…”

Effect of grain size changes on corrosion behavior of copper produced by accumulative roll bonding process

“…Severe Plastic Deformation (SPD) can be explained as deformation to large strains below recrystallization temperature without intermediate thermal treatments that can result in UFG structures [3][4][5][6][7] . The accumulative roll bonding (ARB) is one of the severe plastic deformations that proposed by Saito et al 8 .…”