Electrochemical behaviour of amorphous electrodeposited chromium coatings

► X-ray amorphous hard chromium coatings from glycine based Cr(III) plating baths. ► X-ray energy dispersive analysis detected 3-7 wt% O content. ► Carbon as an accumulation within the surface irregularities of deposits. ► Polarisation resistances in passive state acid corrosion by impedance spectra. ► Impedance spectra revealed passivity of chromium coating with deposition parameters.