STUDIES ON CORROSION OF WELDED ALUMINIUM AND ITS ALLOY PLATES

Abstract

This report deals with the studies on stress corrosion of argon welded ANP (Al-4% Mg-0.5% Mn-0.2% Cr) plates dipped in the brine and aqueous solution of 3% NaCl+0.1% H2O2.The stress corrosion cracking does not occur in any case. The electrode potentials of deposited zone measured in the aqueous solution of 3% NaCl+0.1% H2O2 are more noble than those of mother plates.Corrosion of the mother plates occurs especially on the heat affected zone, but very little on the deposited one.Corrosion of the heat affected zone of the plates in the case of oxyacetylene gas welding is more remarkable than that in the case of argon welding (Heriarc, Sigma).