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Abstract
A comparison was made between the electrochemical corrosion behaviour of electrodeposits prepared from sulphate, sulphamate and Watt’s bath on mild steel substrate. Potentiodynamic polarisation tests, electrochemical impedance spectroscopy (EIS), SEM and XRD were the techniques used to characterise the corrosion behaviour. The potentiodynamic studies revealed the current density versus potential for the coated and uncoated substrates and the difference in their corrosion potentials Ecorr. In all cases, the Ecorr shifted to a more positive potential after the coatings were applied. The EIS measurements as a function of immersion time were carried out in a 3·5% NaCl solution at the Ecorr. The corrosion parameters, such as lower corrosion current density Icorr and higher polarisation resistance Rp, were found in coating from sulphamate bath.
Published Version
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