Corrosion resistant steels have been increasingly used in modern manufacturing day by day, as their use area is increasingly expanding. They are increasingly used in construction, nautical, shipbuilding, etc. They represent one of the most important groups of structure corrosion resistant materials. At the same time these materials become very prone to local corrosion damage in certain conditions. The theoretical part shows the various types of stainless steels. The corrosion resistance of stainless steel and the factors that influence corrosion resistance are also described as well as corrosionmechanisms. Special emphasis was given on the problems of the pitting corrosion, as well as the influence of external factors on the perforation corrosion mechanism. Particular emphasis was given to the effect of changing the chloride content in aqueous solutions on occurrence of pitting corrosion. In the experimental part, electrochemical corrosion tests have been carried out on chloride corrosion on the corrosion resistance of stainless steels. Austenitic stainless steels AISI 321 and AISI 316L, supeaustenitic stainless steel UNS S31050, duplex stainless steel AISI 2304 and superduplex stainless steel AISI 2507 steel were tested in in waters with different chloride contents (50 ppm CI - , 1900 ppm CI - and 19000 ppm CI - )and electrochemical corrosion parameters were defined. After the experimental part, the results were analyzed and based on the results the conclusion was drawn.