Influence of alloying additives on corrosion and hydrogen permeation through commercial aluminium in alkaline solution

The influence of alloying additives on the extent of corrosion and hydrogen permeation through aluminium of different grades such as 2S, 3S, 26S and 5 7S, in 0.01 M NaOH has been investigated using weight loss measurements and electropermeation. It is found that the extent of self corrosion and hydro gen permeated through different grades of commercial aluminium follow the o rder: 3S > 2S > 26S > 57S. The influence of incorporating zinc and indium e ither alone or in combination on self corrosion and permeation current has also been studied. It is found that ternary alloys of both 26S and 57S cont aining zinc and indium give considerably lesser values of self corrosion ra te and permeation current.