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The role of arsenate ions and cathodic charging on the environmentally assisted cracking (EAC) behaviour of a Mg-Mn alloy in 0.6M NaCl saturated with Mg(OH)2 was investigated. The stability of the surface film and the repassivation kinetics have been found to play a critical role in the EAC tendency of the alloy than hydrogen-assisted mechanisms. Cathodic charging was found to be beneficial in lowering the EAC tendency of the alloy.