In this work, the effect of the nature of the salt anion (chloride and sulphate) in the Cu–Zn citrate bath was investigated, using cyclic voltammetry (CV) and chronoamperometry (CA). Experimental electrodeposition parameters (switching potential and imposed potential) were varied in order to examine their influence on the deposits. The coating microstructures were observed by scanning electron microscope (SEM-EDS), the coating phases were characterized by X-ray diffraction (XRD) analysis and the surface composition was assessed by XPS. Higher current efficiency was obtained in chloride baths compared to sulphate baths and best deposits were obtained at compared to and . Corrosion test results in 0.5 M NaCl solution show that Cu–Zn deposit produced from chloride bath exhibited the highest corrosion resistance.

In this work, two aluminum alloys, Al-5Zn-0.5Sn and Al-5Zn-0.5Sn-2.6Mg, were prepared by melting in an induction furnace to be used as sacrificial anodes for cathodic protection of marine structures. The alloys are characterized by scanning electron microscopy mapping coupled to energy dispersive X-ray analysis, X-ray photoelectron spectroscopy and X-ray diffraction. Afterwards, the corrosion behavior was studied in 3 wt.% NaCl solution through immersion tests, potentiodynamic polarization, electrochemical impedance spectroscopy and weight-loss measurements. Results display that active dissolution of Al-5%Zn-0.5%Sn-2.6%Mg alloy and its quasi-uniform corrosion is associated with the major precipitates MgZn2 and Mg2Sn particles formed during the melting process. Galvanic coupling measurements over 45 d were carried out on both alloys. The sacrificial cathodic protection of both anodes was successful but the couple efficiency was greater for Al-Zn-Sn-Mg owing to its more negative corrosion potential and uniform dissolution.

The objective of this study is to investigate the relationship between the cathodic polarization, the evolution of hydrogen, and its effect on the formation of calcareous deposits on X60 pipeline steel in a simulated soil solution and its behavior at open‐circuit potential (OCP) after interruption of cathodic polarization. Electrochemical measurement (chronoamperometry, potentiodynamic polarization, OCP evolution, electrochemical impedance spectroscopy (EIS)), and surface characterization techniques are used. The time evolution of EIS spectra is examined. The results show that cathodic polarization favors the release of hydrogen, and weakens and/or prevents the formation of calcareous deposits on the steel surface. After stopping polarization, the corrosion kinetics is retarded for high cathodic potentials, which could be due to the blocking of the surface by the adsorbed hydrogen.