Sayantani Basu, Amit Sarkar, Shampa Dhar and Subhadra Sahoo
Keywords: Hardness, Tenslie, potentiodynamic polarization, EIS, SEM, XRD
Abstract:
<p class="MsoNormal" style="text-align:justify;line-height:150%">In
this current study corrosion behaviour of Al7075 alloy with different
pre-strain was studied. Mechanical behaviour as well as electrochemical
behaviour of as received and different pre strained alloys was studied in 3.5 %
NaCl solution. The hardness value of this alloy increased with prestrain. The
strength of the alloy is also improved with the increment of strain but the
elongation of this alloy decreased. Potentiodynamic polarization test results
show that the rate of corrosion increases with increasing pre strain. The electrochemical impedance spectroscopy
(EIS) results also revealed a variation and charge transfer resistance value
which also support the corrosion results. The SEM images also show a gradual
degradation of the surface morphology with increasing pre strain. XRD results
confirmed the precipitation of MgZn<sub>2</sub> which is responsible for the
improvement of hardness as well as strength of this alloy.</p>
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