BENDEBANE Salima (Co-Auteur)2025-09-082025-09-0820232602-277Xhttp://dspace.ensti-annaba.dz:4000/handle/123456789/744International Journal of Chemistry and Technology DOI: http://dx.doi.org/10.32571/ijct.1230422Electrodepositions of zinc–nickel alloy thin films on Low-carbon steel from sulfate acid baths were studied. An experimental design and optimization procedures for Zn‐Ni alloy electroplating was applied using Minitab 19. This paper analyzed a six‐variable in two steps. (1) A Mixture Design (MD) where the best proportion between boric acid, saccharin, and 2-butyne-1,4-diol was determined. (2) Box Behnken design to find the most optimal conditions for zinc‐nickel electroplating. For that temperature, current density, and the ratio [Ni2+]/[Zn2+] are the tested parameters.In step 1 the best bath composition was [boric acid] = 0.1M, [saccharin] = 0.3 g/L, and [2butyne-1,4-diol] = 0.1 g/L.It was found, from step 2, that the best coating in terms of quality, brightness, and hardness was obtained under the following conditions: T= 30°C; i= 0.5A/dm2 and [Ni2+]/[Zn2+] = 0.53 with a theoretical response of 312.66 HV and an experimental response of 312.30 HV. These results were confirmed by two analyses morphological (SEM) and elemental (EDS)enArticle