Mott-Schottky图、Nyquist图及阳极极化曲线测定研究了硼酸-硼砂缓冲溶液中硫离子对不锈钢钝化膜耐蚀性能的影响，结果表明：随浸泡时间增加不锈钢电极阻抗值增大，但硫离子加入后阻抗值快速降低；阳极极化曲线测定显示硫离子使不锈钢钝态电流增大；硫离子浓度的增加使不锈钢电极的Mott-Schottky图中体现p-型半导体(铬氧化物)性质的直线段发生较大变化，说明硫离子影响了钝化膜中铬氧化物的性质，使其耐蚀性能降低. 钝化膜
INFLUENCE OF SULFIDE ON PASSIVE FILMS OF STAINLESS STEEL IN BORATE BUFFER SOLUTION GE Hong-hua，ZHOU Guo-ding，WU Wen-quan Environmental Engineering Department,Shanghai University of Electric Power 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 [JP2]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.[JP] mott-schottky plot; nyquist plot; stainless steel; passive film
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