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中国腐蚀与防护学报  2007, Vol. 27 Issue (2): 84-92     
  研究报告 本期目录 | 过刊浏览 |
304不锈钢在NaCl-(NH4)2SO4-NH4Cl溶液中的的腐蚀行为
周德璧;刘丹平;莫成千;吕新坤
中南大学化学化工学院
CORROSION BEHAVIOR OF 304 STAINLESSSTEEL IN NaCl-(NH4)2SO4-NH4Cl SOLUTIONS
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中南大学化学化工学院
全文: PDF(1407 KB)  
摘要: 用电化学极化曲线和交流阻抗方法,研究了对304不锈钢(304SS)在3%NaCl和NaCl-(NH4)2SO4-NH4Cl混合溶液中的腐蚀行为.结果表明, 在混合溶液中浸泡750 h后,304SS仍然保持良好的钝化状态,其平均腐蚀电流密度为0.056 mA/cm2.根据交流阻抗研究结果,不锈钢在3%NaCl溶液中,主要表现出裸金属表面的点蚀和形成一定程度的钝化膜的特征,在2.0 g/L NaCl、0.67 g/L(NH4)2SO4、2.3 g/L NH4Cl混合溶液中,不锈钢表面形成稳定致密的钝化膜的典型特征.此钝化膜的电阻远小于腐蚀反应极化电阻.即使在形成良好的钝化膜的情况下,不锈钢所表现出的优良的抗腐蚀性能主要是由于金属表面活性点的钝化,而非钝化膜对离子导电或者对反应物/产物的扩散过程的阻隔作用.
关键词 不锈钢腐蚀交流阻抗谱垃圾腐蚀    
Abstract:The corrosion behaviors of 304 stainless steel (304SS) in 3%NaCl solution and in mixed solution of 20 g/L NaCl+0.67g/L (NH4)2SO4+2.3 g/L NH4Cl were investigated using polarisation curve and electrochemical impedance spectroscopy (EIS) methods.304SS maintained its good passive state after immersed in the mixed solution for 750 h.Its average corrosion current density in this medium was determined to be of 0.056 mA/cm2.It was found from EIS studies that in 3%NaCl solution,304SS exhibited a pitting corrosion behavior of bare metal with a thin passive film;while in the mixed solution,it showed a more typical feature of stable and complete passive film.The ohmic resistance of this passive film was much smaller than the charge transfer resistance of corrosion reaction.The good anti-corrosion performance of 304SS could be mainly attributed to the inactivation of surface site rather than to the barrier effect of the passive film against the ionic conductance or against the diffusion of reactants /products.
Key wordsstainless steel    corrosion    impedance spectroscopy    garbage corrosion
收稿日期: 2005-08-24     
ZTFLH:  TQ050.9+1  
通讯作者: 周德璧     E-mail: zhoudb@mail.csu.edu.cn

引用本文:

周德璧; 刘丹平; 莫成千; 吕新坤 . 304不锈钢在NaCl-(NH4)2SO4-NH4Cl溶液中的的腐蚀行为[J]. 中国腐蚀与防护学报, 2007, 27(2): 84-92 .
. CORROSION BEHAVIOR OF 304 STAINLESSSTEEL IN NaCl-(NH4)2SO4-NH4Cl SOLUTIONS. J Chin Soc Corr Pro, 2007, 27(2): 84-92 .

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2007/V27/I2/84

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