The corrosion of a magnesium alloy containing rare earth elements (WE43 type alloy) was studied in 0.05 and 0.5 M\ud Na2SO4 or 0.1 and 1 M NaCl solutions using electrochemical techniques: linear polarization resistance, potentiodynamic\ud polarization, impedance measurements. The electrolytes favoured anodic magnesium oxidation but the\ud presence of rare earth elements improved the tendency of magnesium to passivation. The dissolution rates in\ud chlorides were higher than in sulphates because chlorides, in contrast to sulphates, interfered with the formation and\ud maintenance of a protective layer of corrosion products which decreased the severity of the attack. The effects of\ud galvanic corrosion due to cathodic intermetallic precipitates at grain boundaries were particularly evident in\ud chloride media at long testing times

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This study concerns the corrosion behavior of steel in different room temperature cured alkali-activated fly ash mortars exposed to chloride solution. The corrosion process was monitored by polarization resistance and corrosion potential measurements and the results were interpreted in the light of a complete microstructural, mechanical and chemical characterization of the mortars. The most compact alkali-activated mortars have higher porosity and lower mechanical properties than a cement-based mortar (CEM), but the protectiveness afforded to the rebars is slightly higher than that obtained in CEM. The reason for this discrepancy is connected to a lower chloride content accumulated in the former mortar type and to a specific inhibition of the rebar corrosion afforded by the pore electrolyte in alkali-activated mortars

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