Role of second phase particles in pitting corrosion of 3003 Al alloy in NaCl solution

Abstract

The second phase particles in 3003 aluminum (Al) alloy were characterized by scanning electron microscope, energy-dispersive X-ray analysis and X-ray diffraction techniques. The role of second phase particles in Al alloy pitting corrosion was investigated by cyclic polarization measurement, and scanning vibrating electrode technique. Results demonstrated that the second phase particles in 3003 Al alloy are mainly Al x (Fe,Mn) intermetallics, with an average diameter of about 5 mm. The enrichment of Mn in second phase particles forms a galvanic cell effect relative to the adjacent Al alloy substrate. The initiation of pitting corrosion of 3003 Al alloy is the local dissolution of Al substrate around the second phase particles. When a sufficient amount of Al is dissolved away, the second phase particles drop off from the Al substrate, forming large pitting cavities that are usually linked each other.

Inhibiting effect of cerium ions on corrosion of 3003 aluminum alloy in ethylene glycol–water solutions

“…4) are primarily Al x (Fe, Mn) intermetallics, as characterized by previous study [8] as well as the high content of Mn in EDX results in Fig. 5 and Table 2.…”

“…5 and Table 2. It has been acknowledged [8,26,27] that the Mn-enriched second phase particles forms a galvanic effect relative to the adjacent Al alloy substrate, where the particles serve as cathode and the Al alloy substrate as anode. Cathodic reactions occurring at second phase particles are dominated by the reduction of oxygen:…”

“…Previous study conducted in Cheng's group [1][2][3][4][5][6][7][8][9] has demonstrated that Al alloy would experience pitting corrosion, flow-assisted corrosion and erosion-corrosion in the automotive cooling system, even in the inhibited coolant. It was reported [10,11] that, although inhibitors have been added in the commercial coolants, i.e., ethylene glycolwater solutions, most of them are not designed for corrosion inhibition of Al alloys, but for stainless steels and copper alloys that have been the conventional materials for fabrication of the automotive heat exchangers.…”

Characterization of passivity and pitting corrosion of 3003 aluminum alloy in ethylene glycol–water solutions

“…In the previous work [36], it was established that a galvanic effect exists between the Mn-enriched second phase particles and the adjacent Al alloy substrate, where second phase particles serve as the cathode and Al alloy as the anode. Occurrence of pitting corrosion of Al alloy is resulted from the local dissolution of the Al alloy substrate around the second phase particles.…”

Corrosion resistance of Pb-free and novel nano-composite solders in electronic packaging

“…Many studies have reported that the corrosion behavior of alloys depends on the second phase distribution, shown to be Mg alloy [61,62] and Al alloy [63]. In the Sn3.5Ag0.Cu nanocomposite solder alloys, the microstructure had finer β-Sn grains, a large amount of Ag 3 Sn particles, and a small amount of oxidize nanoparticles.…”