To test pitting resistance of stainless steel the galvanostatic polarization technique was applied. Principal E-t curve is given in fig. 2. The steel specimen was immersed into the solution and kept without any applied polarization for 30 min. After corrosion potential Ecor was established a constant anodic current of 30 mkmA was applied. The steel electrode potential shifted to positive values, and after pittings were formed - decreased to negative values. When a potential reached constant value Ep polarization was turned off. The potential on the specimen surface was output to a data recorder.