The corrosion and galvanic corrosion of LaFe11.6Si1.4 alloy were investigated. The microstructure showed the presence of three phases: La(Fe,Si)13, alpha-Fe and La-Fe-Si. Experiments indicated that the corrosion of each phase increase in the order: La-Fe-Si > La(Fe,Si)(13) > alpha-Fe in the alkaline water and 0.05 M BTA/0.05 M sodium benzoate inhibitor solution. Galvanic corrosion measurement gave corrosion current densities of 37 mu A cm(-2) for alpha-Fe/La-Fe-Si and 4.3 mu A cm(-2) for alpha-Fe/LaFe11.6Si1.4 coupled electrodes in the alkaline water. The corresponding values were 5.3 mu A cm(-2) and 0.5 mu A cm(-2) in 0.05 M BTA/0.05 M sodium benzoate mixed solution. However, in the case of LaFe11.6Si1.4/La-Fe-Si coupled electrode, galvanic corrosion current density remains nearly constant although the potential difference is not the same in the two solutions. (C) 2011 Elsevier B.V. All rights reserved.