Abstract
Corrosion of aluminum and its alloys in boiling CCl4 is pitting at least in the early stages. In the electropolished, flat specimen-surface, a single pit could be developed from an indentation made by using a diamond needle. By measuring the growth rates of the single pits, corrosion rates of 1080 Al, Al-Mn and Al-Mg alloys have been determined in boiling CCl4 containing pre-determined amount of water. A conical deposit of the corrosion product protruded in the solvent from the pit. The growth rate of pit depth is smaller than that of pit periphery for all of the alloys. As for 1080 Al, the effect of water on the single-pit growth has been studied. Presence of water in the bulk accelerates the growth of pit periphery but not of pit bottom.
