Friction stir processing was done for surface modification of cast Magnesium-Aluminum alloy. The microstructural characteristics related to different phases of untreated cast Magnesium-Aluminum alloy, friction stir processed under different process parameters like rotational speeds at 380rpm and 545 rpm with 31.5 mm/min transverse speed with and without pure aluminum powder were investigated by Metallurgical microscopy at lower magnification and scanning electron microscopy at higher magnification. Pure aluminum powder of fine size (~19µm) was filled in the groove made at the center of the Magnesium-Aluminum alloy plate which cover 33 vol% of pure aluminum during friction stir processing. The electrochemical behavior of the Magnesium-Aluminum alloy, Friction stir processed Magnesium-Aluminum alloy without aluminum powder and Friction stir processed Magnesium-Aluminum alloy with pure aluminum powder were investigated using Potentiostat in 5 wt % sodium chloride (NaCl) solution.Surface of all conditions specimens were analyzed for the phases present on the surface by X-Ray Diffractometer (XRD) which revealed different peaks of α-Mg phase, β-phases (Mg17Al12) and Pure Aluminum . In friction stir processed Magnesium-Aluminum alloy double pass with aluminum powder all these peaks were observed. The electrochemical corrosion tests revealed the least corrosion rate (0.603 X 102mpy) for friction stir processed double pass with aluminum powder amongst all the tested specimens. The improvement in corrosion resistance of friction stir processed double pass with aluminum powder is because of more formations of the β-phases (Mg17Al12) and aluminum dissolved in the α-Mg phase.
Abstract:This research proposal provides corrosion behaviour of Manganese added Magnesium and its alloys. Magnesium is lightest of all Engineering metals and therefore it is attractive alternatives for Steels and aluminium. The corrosion of Mg and its alloys continues to be a major technological issue preventing wider usage of such alloys. Different corrosion like Galvanic corrosion, pitting corrosion, intergranular corrosion (IGC), filiform corrosion, crevice corrosion, stress corrosion cracking (SCC), and corrosion fatigue (CF) were already discussed for Mg alloys by different researchers [13] . In Magnesium-Aluminium (Mg-Al) alloys, the formation of intermetallic Al 8 (Mn,Fe) 5 phase improves the corrosion resistance by removing elemental iron particles from the Mg and its alloy [10] . The corrosion rate examined via electrochemical and Weight loss method (Immersion test). It was seen that samples with Mn additions exhibited an increased Fe impurity tolerance level. This indicates that the Mn addition was able to moderate the effect of the Fe impurity on the corrosion of the Mg alloy. In addition, influencing factor of corrosion behaviour of Mg alloys like effect of allying element, Microstructure and secondary phases, grain size, effect of welding and heat treatment were discussed.
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