Conclusion Inhibition performance of Aloe Vera extract as a green inhibitor for the stainless steel in 1 M sulfuric acid solution was investigated. Findings could be concluded as follows: The effectiveness of Aloe extract as a corrosion inhibitor for stainless steel in 1 M sulfuric acid solution was proved through taking advantage of electrochemical techniques as well as SEM surface analysis. DC polarization proved that the Aloe extract could be classified as mixed-type corrosion inhibitor with predominantly anodic action. EIS measurement showed that charge transfer is the dominate phenomena controlling corrosion of stainless steel in 1 M sulfuric acid solution. It was shown that for eliminating DC tend from raw EN data, the value p could significantly change the shape, amplitude, and the width of transients. However, p = 16 was best correspond to the results obtained from other electrochemical methods. Through investigating the current transients in EN analyze, passive layer breakdown on the surface of stainless steel in 1 M sulfuric acid solution was illustrated. It was demonstrated that the major Aloe compounds including Aloin, Aloesin, Aloe Resin, and Aloe Emodin (as a biotransforma- tion of Aloin) are composed of many oxygen atoms in functional groups of O-H,C=O,C-O, and O-heterocyclic ring, allowing aloe extract to protect stainless steel from corrosion. It was found that the Langmuir adsorption isotherm would best describe the adsorption of aloe extract on the surface. Regarding to the Langmuir isotherm, the adsorption of aloe extract on the surface of stainless steel was based on physical interaction.