A study of the problems connected with the coating of aluminium by molten lead has been made. A theoretical approach shows that lead only wets the aluminium surface if the latter is completely free of oxide. Contact of liquid lead with a “clean” aluminium surface may be effected by using an intermediate layer of molten chlorides as a flux and this process has been studied using electrochemical methods. It has been shown that the flux (formed by a eutectic mixture of KCl and ZnCl2) reacts with the aluminium to form a surface layer of various Al-Zn alloys as shown by electron probe microanalysis. After removal of all traces of chlorides, the resulting surface may be readily wetted by molten lead at the appropriate temperature.