n‐butylamine is a fairly satisfactory inhibitor for the corrosion of aluminium‐manganese alloy in hydrochloric acid solutions. Polarisation studies indicate that the anode polarisation is negligible, whereas the cathode polarisation is appreciable and is increased by the inhibitor. The Tafel plot holds good in this case. The dissolution of the metal is electrochemical in character. The corrosion process with this amine appears to be under cathodic control.
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