The electrodeposition of tin-zinc alloys with 20-30% Zn by weight from sulphate-gluconate baths at pH 4 and different [Sn(II)], [Zn(II)] and [gluconate]/([Sn(II)] + [Zn(II)]) ratios was studied. The anodic stripping analysis of the deposits was correlated with their morphology, composition and phase structure. When [Zn(II)] is equal to or not much greater than [Sn(II)], a eutectic type Sn-Zn alloy is obtained, with a Zn content of around 20% by weight, which is greater than that of a thermal eutectic alloy. The morphology of the electrodeposited eutectic Sn-Zn alloy tends to disappear at high deposition charges and a second crystalline coating, richer in Sn, is obtained. (C) 2003 Elsevier Science B.V. All rights reserved.