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| CURRENT FLUCTUATIONS DURING PIT INITIATION ON NiCrFeSiB AMORPHOUS ALLOYS |
| Zuo Yu(Beijing University of Chemical Technology) |
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Abstract The current fluctuations during pit initiation of two NiCrFeSiB amorphous alloy with different Cr contents in neutral NaCl solutions were investigated using slow potential scanning method. Each curreat fiuctustion gives the information of formation and repassivtion of a single metastable pit. The increase of NaCl concentration in solution resulted in increases of nucleation and growth rates of these metedable pits. The growth rate of the pity was for accelerated by increased potential. AS compared with the alloy of higher Cr content, the nucleation and growth of methetable pits for the low Cr alloy were faster,and its pitting breakdown potential Eb was more cathodic and scattered in a wider potential range. On the average, Q values, the charge quantities calculated from peaks and duration of curreat fluctuation of metastable pits were smaller for the lower Cr alloy than those for the higher Cr alloy, suggesting a sxualler critical she for a metastable pit to grow into a stable one in the former case. The life time of metastable pits followed Weibull probability distribution. The relation between nucleation of metastable pits and growth of stable pits was discussed.
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Received: 25 February 1995
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| 1ZhangBP,HabazakiH,KawashimaA,AsamiK,HashimotoK．Corros．Sci,1992,33:6672WilliamsDE,WestcottC,FleischmannM．J．Electrochem．Soc,1985,132:1796,18043KeddamM,KrartiM,PallottaC．Corros,1987,43:4544funkelGS,StockertL,HunkellerF,BoehniH．Corros,1957,43:4295水流彻,坂入正敏．防食技术,1990,39:3556ShibataT,TakeyamaT．Corros,1977,39:3557半田隆夫,宫田惠守,高泽寿佳．防食技术,1989,38:5298坂入正敏,西方笃,水流彻．防食技术,1991,40:183 |
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