INFLUENCE OF SULFIDE ON PASSIVE FILMS ON STAINLESS STEEL IN BORATE BUFFER SOLUTION
硼酸-硼砂介质中硫离子对不锈钢钝化膜的侵蚀性

The passive films formed on stainless steel in borate buffer solution contained certain among of sulfide,the influence of which on corrosion behavior of the passive film has been studied using Mott-Schottky plots,Nyquist plots and anodic polarization curves.It is shown that the impedance of the stainless steel electrode increases with immersing time,but decreases sharply due to the presence of sulfide.With the increase of sulfide,the passive current of stainless steel electrode rises,and the Mott-Schottky plots change in the region of chromium oxide.It is concluded that sulfide is detrimental to the formation of passive film on stainless steel and the passive film is less protective in the presence of sulfide.