摘要
冶炼了不同铈含量的00Cr12铁素体不锈钢,采用Cu-CuSO4-16%H2SO4浸泡实验法和交流阻抗(EIS)法研究了不同热处理状态下铈添加量对00Cr12铁素体不锈钢晶间腐蚀的影响规律。试验结果表明:均未添加稀土,950℃保温2 h的试样比650℃保温2 h的试样腐蚀沟深,加入0.01%铈的试样均未发现腐蚀沟,但铈添加量>0.04%时试样腐蚀又开始恶化。950℃保温2 h处理试样阻抗弧明显小于650℃保温2 h处理试样,表明00Cr12在950℃敏化程度更高。两种热处理试样均在添加铈0.01%～0.02%时阻抗较大,电荷转移电阻Rt较高,表面电容Cc和双电层电容Cd较小,抗晶间腐蚀能力较强。
00Cr12 ferrite stainless steel with different content of cerium was smelted, and effect of amount of cerium on intergranular corrosion of 00Cr12 ferrite stainless steel under different heat treatments was in vestigated by means of CuCuS0416% H2SO4 tests and electrochemical impedance spectroscopy （EIS）. It was found that without cerium, the corrosion ditch of specimens treated at 950 ℃ for 2 h are deeper than that treated at 650 ℃ for 2 h. No corrosion ditch was found in the specimens added 0.02% cerium under both kind of heat treatment. However, when cerium adding content was more than 0.04% , the specimens＇ corrosion became aggravated. The impedance of specimens of 950 ℃ for 2 h were evidently less than that of the specimens of 650 ℃ for 2 h, which showed that the sensitization level of 00Cr12 treated at 950 ℃ was higher than that of the specimens of 650 ℃. For the two kinds of specimens with different heat treatment （950 and 650 ℃ ）, the specimens added 0.01% 0. 02% cerium had a bigger impedance, a higher charge transfer resistance （Rt） , a smaller surface ca pacitance （Cc ） and double electric layer capacitor （Cd ） than that of the specimens added other amount of cerium, which had a stronger anticorrosion ability than that of the specimen with other amount of cerium.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第2期228-233,共6页
Journal of the Chinese Society of Rare Earths
关键词
铁素体不锈钢
铈
晶间腐蚀
电化学阻抗(EIS)
ferritic stainless steel
cerium
intergranular corrosion
electrochemical impedance spectroscopy
