The negative impacts of corrosion are frequent and occur in various activities. The surfactants have been targeted as corrosion inhibitors, because they form protective films on anodic and cathodic areas. Although they areeffective in the corrosion control, some surfactants have high cost andare toxic to the environment, making its use questionable. In order to fulfill the growing demand for sustainable corrosion inhibitors, the objective of the present workwas to perform a research about the inhibitory action of a hydro-alcoholic extract from vegetal specie OurateaParviflora, popularly known as Batiputá. The extract was evaluated in free formand in a micro-emulsified system with different concentrations regarding the corrosion inhibition efficiency into a saline medium (NaCl 3.5%), using a Linear Polarization Resistance method; also determining the behavior and the isotherm of the metal/inhibitor adsorption process. According to the obtained results, the maximum inhibition efficiencies were observed at 67.70% (12.5 ppm), 77.94% (200 ppm) and 85.66% (200 ppm) to the free hydro-alcoholic extract, saline micro-emulsified system (SME-S) and saline micro-emulsified system with Batiputá extract (SME-S-EB), respectively. The (SME-S) presented the maximum efficiency in the concentration (200 ppm), however after the extract solubilization, the efficiency reached a value of 81.86% (25 ppm). In addition, all the experimental data from the adsorption process fitted the Langmuir isotherm. According to the data calculated from Gibbs free energy, it was detected a spontaneity of the adsorbent inhibitors on the steel surface, suggesting that the film formation occurs by physical adsorption of the inhibitor on metal surface. The study of the synthesis of inhibitors under the sustainability bias has confirmed that these new formulations can be considered as sustainable because they use biodegradable, non-toxic raw materials and renewable resources. The results show that the systems can be used as alternative sources in the formulation of corrosion inhibitors.