The decarbonization of European industry will require large-scale underground CO₂ storage. To ensure the long-term safety of storage sites, it is essential to maintain the integrity of both the geological formation and the surface infrastructure. A critical component exposed to elevated risk are production pipelines and tubing, which operate under highly corrosive conditions—typically involving CO₂-saturated brine at elevated temperatures. To mitigate corrosion, chemical inhibitors are commonly injected into the system. In line with sustainability goals, the use of environmentally friendly, or "green," corrosion inhibitors is recommended. Among many green inhibitors, citrus extracts are particularly popular. In this study, the effect of an alcoholic extract from mandarin peels on the surface of N60 steel was investigated in a 3.5% NaCl environment saturated with CO₂ at 60°C. Infrared spectroscopy (IR) was used to identify active compounds in the extract and assess the chemical interactions between the steel and the brine, while surface morphology was evaluated using scanning electron microscopy (SEM). The results showed that the inhibitor remained present on the steel surface even at elevated temperatures, and the steel surface exhibited less degradation and was more homogeneous. The elemental composition of steel determined by SEM-EDS confirms the presence of a protective layer: the Fe content increases from 66.66% (sample without inhibitor) to 82.50% (with inhibitor), which indicates that the Fe dissolution rate decreases in the presence of the inhibitor.