Cathodic Protection of Aluminium Structures

摘要

A study of the literature and a laboratory investigation of cathodic protection of aluminum structures is discussed. In the laboratory investigation the effect of the protection was studied in fresh water. In cathodic protection of aluminum complete cathodic protection is not striven for. The object is, instead, to counteract localized attack, chiefly pitting, and thus to prolong the life of the structure. Cathodic protection can in practice be achieved by three different principles: with impressed current, with sacrificial anodes, or by cladding such as Alclad. The results both of the study of the literature and of the laboratory investigation indicate that the lower limit is in practice below the -1130 mV rel. There is much to suggest that the interval in neutral electrolytes extends down to -1380 mV.