Sprayed Aluminium Coating for Corrosion Protection in Hot Water

Abstract

The corrosion protective properties of the sprayed aluminium coating in hot water were investigated by the immersion test.
Main results of the experiment are summarized as follow;
(1) The sprayed aluminium coating protects the steel substrate with the electrochemical effect in hot water at 60°C.
(2) The potential of the sprayed aluminium coating shifts slightly towards the noble potential with decreasing water temperature.
(3) When mild steel with sprayed aluminium coating and stainless steel are immersed in, an electrolyte and in electrical contact, the dissolution rate of the sprayed aluminium coating is accelerated and its protective life becomes shortened. The galvanic current between the sprayed aluminium coating and stainless steel decreases with decreasing water temperature. Copper ion accelerates.the dissolution rate of aluminium in galvanic corrosion.