Abstract
The effects of a deposition current density (c.d .) on the corrosion behaviour of Zn–Mn alloy coatings, deposited from alkaline pyrophosphate solution, were investigated by atomic absorption spectrophotometry (AAS), X-ray diffraction (XRD), atomic force microscopy (AFM), optical microscopy, electrochemical impedance spectroscopy (EIS) and measurement of corrosion potential ( E corr). XRD analysis disclosed that zinc hydroxide chloride was the main corrosion product on Zn–Mn coatings immersed in 0.5 mol dm −3 NaCl solution. EIS investigations revealed that less porous protective layer was produced on the alloy coating deposited at c.d . of 30 mA cm −2 as compared to that deposited at 80 mA cm −2.
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