食品级磷酸浓度对国产904L不锈钢耐蚀性的影响
Effect of Food Grade Phosphoric Acid Concentration on Corrosion Resistance of Domestic 904L Stainless Steel
摘 要
采用动电位极化曲线和电化学阻抗谱(EIS)研究了常温下国产904L不锈钢在不同浓度食品级磷酸中的腐蚀行为, 并观察电化学测试后的腐蚀形貌。结果表明, 国产904L不锈钢在25%食品级磷酸中具有良好的耐腐蚀性能, 随着磷酸浓度的增加, 自腐蚀电流密度Jcorr先增加后降低, 浓度在40%时Jcorr最大, 抗腐蚀性能最差。EIS曲线由高频端容抗弧和低频端Warburg阻抗组成, 表明904L的腐蚀由电化学反应控制转为主要由扩散控制。
食品级磷酸
电化学腐蚀
极化曲线
电化学阻抗谱
domestic 904L stainless steel
food grade phosphoric acid
electrochemical corrosion
polarization curve
electrochemical impedance spectroscopy
Abstract
Potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) were used to study the corrosion behavior of a domestic 904L stainless steel at room temperature in food grade phosphoric acid of different concentrations. And the corrosion morphologies were observed. The results showed that the domestic 904L stainless steel in 25% food grade phosphoric acid had good corrosion resistance. With the increase of phosphoric acid concentration, the natural corrosion current density Jcorr increased first, and then decreased. At the 40% concentration, the natural corrosion current density Jcorr was the largest and the corrosion resistance was the worst. Impedance spectrum curve consisted of the capacitive reactance arc at high frequency and the Warburg impedance at low frequency, inclicating that the corrosion of 904L was controlled by electrochemical reaction, and then turned to be controlled by material diffusion mainly.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 贵州省优秀青年科技人才项目;贵州省社会发展攻关项目;贵州省工业攻关项目(20103016)
收稿日期 2013/5/30
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备注向嵩(1979-),教授,博士,从事材料的研究,
引用该论文: HU Ya-nan,XIANG Song,WANG Quan-ding. Effect of Food Grade Phosphoric Acid Concentration on Corrosion Resistance of Domestic 904L Stainless Steel[J]. Corrosion & Protection, 2014, 35(3): 244
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参考文献
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【3】吴洪特,于兵川. 湿法磷酸中不锈钢腐蚀的电化学分析[J]. 全面腐蚀控制,2003,17(3):8-12.
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【6】BETOVA I,BOJINOV M,LAITINEN T,et al. The transpassive dissolution mechanism of highly alloyed stainless steels:II. Effect of pH and solution anion on the kinetics[J]. Corrosion Science,2002,44(12):2699-2723.周庆初,曹铁梁,季诚建. 奥氏体不锈钢在高温磷酸浓溶液中的阳极极化行为[J]. 中国腐蚀与防护学报,1995(1):7-14.
【7】杨世伟,常铁军. 材料腐蚀与防护[M]. 哈尔滨:哈尔滨工程大学出版社,2003.
【8】ALAMR A,BAHR D F,JACROUX M. Effects of alloy and solution chemistry on the fracture of passive films on austenitic stainless steel[J]. Corrosion science,2006,48(4):925-936.
【9】周庆初,李诚建. 高温磷酸中材料的腐蚀与阳极保护[J]. 腐蚀与防护,1995,16(1):8-11.
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【12】GAYDOS S P. Passivation of aerospace stainless parts with citric acid solutions[J]. Plating and Surface Finishing,2003,90(3):20-25.
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【14】曹楚南,张鉴清. 电化学阻抗谱导论[M]. 北京:科学出版社,2002:20-24.
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