Quantitative analysis of pitting corrosion behavior of thixoformed A356 alloy in chloride medium using electrochemical techniques

Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

“…After 12 h immersion time, the attack leads to the formation of deep trenches around the intermetallic compounds and to the starting of dissolution of the Al matrix around eutectic Si, as it is highlighted in Figure (c). On the other hand, no corrosive attack is visible for the α‐Al matrix within the grains, in agreement to what it is reported in literature …”

“…Corrosion in A356 is localized at the interface between Fe‐containing intermetallic compounds (in Figure a π Al 8 Mg 3 FeSi 6 intermetallic compound is shown) and α‐Al matrix, which is in agreement with other investigations . The corrosive attack does not initiate homogeneously at the interface, but localizes in those regions of the intermetallic compound that are enriched in Fe, as highlighted in Figure (b).…”

“…Corrosion resistance, especially in aqueous NaCl solution, is as fundamental as material strength in the case of components for transportation industry, because of their long service life. Al–Si–Mg alloys suffer localized corrosion when exposed to NaCl solution; the corrosive attack is determined by the different electrochemical nobility of the constituent phases, which promote microgalvanic coupling, and by the area of contact between the different constituents, which determines the extent of microgalvanic coupling …”

3D study of intermetallics and their effect on the corrosion morphology of rheocast aluminium alloy

“…During rheocasting the alloy is kept in the semisolid state under continuous agitation before injecting or pouring into the die; while thixocasting involves the partial remelting of the billet into the semisolid region [3].…”

Comparison of corrosion behavior between fusion cladded and explosive cladded Inconel 625/plain carbon steel bimetal plates

“…In another word, despite the fact that explosive cladding procedure aggravates the uniform corrosion resistance of Inconel 625, it does not spoil the nonuniform corrosion resistance of superalloy, and only few damaged nuclei can still survive and initiate the localized attack. The main reported non-mechanical reason for nucleation of damages in passive layers is the occurrence of chemically nonuniform zones at which the protective layer cannot achieve a stable development [7,[13][14][15]. Since explosive cladding as a solid state method does not disturb the distribution of chemical elements and preserves the chemical uniformity of Inconel 625 [12], it does not make the passive layer vulnerable to damage nucleation.…”