In order to cause shifting of the potential in the negative direction and to simultaneously control dissolution in sodium chloride solutions, aluminium alloys utilized as anodes in electrochemical power sources contain small additions of alloying elements. This can be achieved with highly pure aluminium alloys. The binary Al-0.2% Ga alloy made of high purity aluminium has a high negative potential (−1570 mV at 10 mA cm−2), but also a high corrosion rate. The addition of 0.2% P to the above alloy decreases corrosion. Impurities present in technically pure aluminium considerably affect the anodic and corrosion behaviour of the investigated alloys. It was found that corrosion of the Al-0.2% Ga and Al-0.2% Ga-0.2% P is controlled not only by the alloying elements, but also by intermetallic compounds (insoluble in the matrix) which contain alloying elements and impurities (Fe) present in technically pure aluminium.