Abstract
Potential-time measurements have been used to study the effectiveness of four wrought heat treatable aluminium alloys and two activated cast alloys in cathodic protection of mild steel. Only strong bicarbonate concentrations showed serious tendencies to passivate the cast alloys. For the wrought alloys the balance of chloride to sulphate/bicarbonate was critical, but with chloride concentrations of 0·1–3% (as NaCl) certain wrought alloys can be used where commercially pure aluminium is unacceptable.
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