Corrosion is a chemical process that leads to damage and degradation of metal. The rate and type of corrosion vary depending on the type of metal, the materials used and the protection measures applied. One of the materials that attracted a lot of attention at the beginning of the 20th century due to its exceptional resistance to corrosion is stainless steel. This resistance results from the corrosion resistance of the protective oxide layer on the surface, which can be further improved by various methods. Stainless steel passivation methods deserve special attention due to their wide application in various industries. In this paper, new promising methods of stainless steel passivation, such as SMAT (Surface Mechanical Attrition Treatment) and PISG (Plasma Immersion Ion Implantation and Deposition) are investigated. These methods achieve a high resistance of stainless steel to corrosion through surface treatment. Also, electropolishing is considered in the work, because it enables the creation of a smooth and shiny surface, which also contributes to corrosion resistance. It is important to note that the passivation of stainless steel today is most often carried out using nitric acid. However, this process is considered important for the environment, and a comparison of an alternative, more ecologically acceptable passivation process with citric acid and a process carried out using nitric acid was hereby made. This works provides an insight into new stainless steel passivation techniques, explores their advantages and potential for reducing the negative impact on the environment.