Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
Search Results
Item Investigation of influence of medium ph and sulfate ion concentrations on corrosion behavior of magnesium alloy ZE41(Allerton Press Inc., 2014) Dinodi, N.; Nityananda Shetty, A.Magnesium alloys have emerged as potential structural materials with all capabilities to even replace close contenders; aluminium alloys in weight-critical applications. High susceptibility to corrosion being the only limitation, corrosion of magnesium alloys continues to gather much attention among the material scientists worldwide. ZE41 is one such alloy of magnesium which is increasingly gaining importance as automobile and aerospace material. In the present study the influence of the medium pH and sulfate ion concentrations on the corrosion behavior of magnesium alloy ZE41 has been investigated using electrochemical techniques like the Tafel extrapolation and electrochemical impedance spectroscopy (EIS). The tests have been carried out in a range of conditions, with gradually varying pH and sulfate ion concentration. The morphology and composition of the corroded alloy surface have been determined by the scanning electron microscopy (SEM) and energy dispersion X-ray (EDX) analysis, respectively. The recorded results reflect a trend of a higher corrosion rate associated with a higher sulfate concentration at each pH and with a lower pH at each sulfate concentration. © 2014 Allerton Press, Inc.Item Alkyl carboxylates as efficient and green inhibitors of magnesium alloy ze41 corrosion in aqueous salt solution(Elsevier Ltd, 2014) Dinodi, N.; Nityananda Shetty, A.Long chain alkyl carboxylates like stearate, palmitate and myristate were investigated for their efficiency in inhibiting the corrosion of magnesium alloy ZE41 in an aqueous salt medium containing 0.2M Na2SO4 and 0.1M NaCl. The techniques like potentiodynamic polarization and EIS, along with SEM and EDX analyses were employed. The inhibition was proposed to be the result of adsorption of alkyl carboxylates, which was found to obey the Langmuir adsorption isotherm. The inhibition was assumed to be the outcome of the formation of a compact modified surface film due to the precipitation of adsorbed alkyl carboxylates of magnesium. © 2014 Elsevier Ltd.