Stainless steel is one of the most commonly used materials in different parts of industry because of its enviable properties. It is alloyed material with a minimum chromium content of 10.5% and a maximum carbon content of 1.2%. Because of certain content of chromium, stainless steel forms a passive layer on the surface of the material which prevents corrosion. Although this is a material which is passivated, it still undergoes to pitting. In this work, research has been conducted with the aim of additional protection of stainless steel and improvement of its corrosion resistance by using octadecyl phosphonic acid (ODPA) and stearic acid technology to create self-assembling monolayers (SAMs) on the surface of the material. In this research the polarization resistance of untreated stainless steel type 316 and processed steel stearic and phosphonic acid concentration 0,005M, 0,0005M and 0.01 M have been investigated by linear polarization method, and specific polarization parameters of Tafel extrapolation method have been expressed to determine the corrosion current and corrosion potential. The method of electrochemical impedance spectroscopy (EIS) determined phase angle and module Z that represent a change of resistance as function of frequency. Insight into the surface condition on the possible occurrence of corrosion (pitting) has been achieved with scanning electron microscope (EIS). The results showed that the corrosion stability of stainless steel treated with different concentrations of stearic acid and octadecyl phosphonic acid depends on the temperature and concentration. In this research it has been shown that highest polarization resistance and its increase, and therefore the best corrosion protection, has a sample treated with a 0.01 M octadecyl phosphonic acid oxidated at temperature of 80°C. A similar trend is monitored with stearic acid, but compared to ODPA, stearic acid has a lower polarization resistance regarding to the same concentration and oxidation temperature of ODPA. Surface analysis showed that regardless of whether the treated stainless steel with ODPA or stearic acid, pitting phenomenon is still present, so the better protect of stainless steel from pitting will have to be the subject of further research.