In France, some of nuclear wastes are packaged in stainless steel containers and stored in above- ground storage facilities. These waste packages are likely to remain in interim storage for a period of several decades before being moved to an underground facility for permanent disposal. During the interim period of storage, atmospheric aerosols will deposit on the container surfaces, in particular in marine atmosphere, where sprayed droplets are carried by the wind from the sea. The droplet deposits on the exposed surface and becomes saline sessile droplet. This creates an electrolyte of finite size that can react with the metallic surface, leading to an atmospheric corrosion phenomenon. Moreover, the day/night cycles induce a variation of the relative humidity and the temperature: this leads to a constant repetition of evaporation and condensation phases which can increase the corrosion phenomena [1]. The aim of the study is to enrich and develop a numerical analysis of the corrosion under droplet, so as to accurately predict its impact on the lifetime of the materials. We propose a numerical model of evaporation dynamics of salty sessile drops, built with Basilisk, a free software which implements finite volume methods for the Navier-Stokes equations [2]. Our numerical results will be validate with litterature and experimental data.