SAF2507在高温高浓度磷酸中的电化学性能
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摘要
采用动电位极化、电化学阻抗谱技术对超级双相不锈钢SAF2507在高温高浓度磷酸中的腐蚀行为进行研究。结果表明,SAF2507在64%~72%的85℃磷酸中发生自钝化,且随着浓度增加到80%~88%时,腐蚀电流密度增大,其值仍较小。SAF2507在25~70℃的76%浓度磷酸中,有二次活化现象。随温度升高,SAF2507的反应过程由电化学步骤控制转变为电化学和扩散反应共同控制,且容抗弧半径逐渐减小,极化电阻逐渐减小,耐蚀性能下降。
The corrosion behavior of SAF2507 in high temperature concentrated phosphoric acid has been studied with dynamic potential polarization and electrochemical impedance spectroscopy.The results showed that SAF2507 is self-passivation in 64%-72% phosphoric acid at 85 ℃ and the corrosion current density increases when the concentration increases to 80%-88%.It exhibits re-activation phenomenon in 76% phosphoric acid from 25℃to70 ℃.With the increase of temperature,the controlling reaction process of SAF2507 is from electrochemistry to electrochemistry and diffusion reaction.Meanwhile,the capacitive arc radius and polarization resistance decreases gradually,which causes the decay of corrosion resistance.
The corrosion behavior of SAF2507 in high temperature concentrated phosphoric acid has been studied with dynamic potential polarization and electrochemical impedance spectroscopy.The results showed that SAF2507 is self-passivation in 64%-72% phosphoric acid at 85 ℃ and the corrosion current density increases when the concentration increases to 80%-88%.It exhibits re-activation phenomenon in 76% phosphoric acid from 25℃to70 ℃.With the increase of temperature,the controlling reaction process of SAF2507 is from electrochemistry to electrochemistry and diffusion reaction.Meanwhile,the capacitive arc radius and polarization resistance decreases gradually,which causes the decay of corrosion resistance.
引文
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2 Fu Y H.Study on the erosion-corrosion of a new duplex stainless steel for flow passage component in phosphate slurry[D].Xi’an:Xi’an University of Architecture and Technology,2009(in Chinese)付永红.磷酸浆料过流部件用双相不锈钢新材料冲刷腐蚀的研究[D].西安:西安建筑科技大学,2009
3 吴玖.双相不锈钢[M].北京:冶金工业出版社,1999
4 Tan H,Jiang Y,Deng B,et al.Effect of annealing temperature on the pitting corrosion resistance of super duplex stainless steel UNS S32750[J].Mater Characterization,2009,60(9):1049
5 Deng B,Jiang Y,Gong J,et al.Critical pitting and repassivation temperatures for duplex stainless steel in chloride solutions[J].Electrochimica Acta,2008,53(16):5220
6 Frankel G S,Cottis R A.Principles of corrosion in liquids[M]//Bob Cottis,Mike Graham,Rob Lindsay,et al.Shreir′s Corrosion.4th Ed.Amsterdam:Elsevier,2010:725
7 Xiang S,Li Y L,Wang J P,et al.Corrosion behavior of 316Land45 N+in food grade phosphoric acid[J].J Mater Protection,2012,45 (8):31(in Chinese)向嵩,李艳丽,王江平,等.316L和45N+双相不锈钢在食品级H3PO4中的腐蚀行为[J].材料保护,2012,45(8):31
8 Song S Z,Tang Z L.An electrochemical impedance analysis on aluminium in 3.5%NaCl solution[J].J Chin Soc Corros Protection,1996,16(2):127(in Chinese)宋诗哲,唐子龙.工业纯铝在3.5%NaCl溶液中的电化学阻抗谱分析[J].中国腐蚀与防护学报,1996,16(2):127
9 Sun M,Xiao K,Dong C F,et al.Electrochemicl behavior of 300M and Cr9steel in acidic environments[J].J Chin Soc Corros Protection,2012,32(6):449(in Chinese)孙敏,肖葵,董超芳,等.300M和Cr9钢在酸性介质中的电化学性能研究[J].中国腐蚀与防护学报,2012,32(6):449
10 Fu Y,Lin C J,Luo Y X,et al.A study on the selective dissolution behavior of duplex stainless steel in systems containing nitric acid[J].J Chin Soc Corro Protection,2004,24(5):17(in Chinese)付燕,林昌健,罗亦旋,等.双相不锈钢在含硝酸体系中的优选腐蚀行为研究[J].中国腐蚀与防护学报,2004,24(5):17
11 曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2008:92
12 Liu G Q,Zhu Z Y,Ke W.The pitting of stainless steel and nickelbased alloys in acetic acid solution containing bromine ion[J].Acta Metall Sinica,2001,37(3):273(in Chinese)刘国强,朱自勇,柯伟.不锈钢及镍基合金在含溴醋酸仲的电蚀行为[J].金属学报,2001,37(3):273
13 Mohammadia F,Nickchia T,Attara M M,et al.EIS study of potentiostatically formed passive film on 304stainless steel[J].Electrochimica Acta,2011,56:8727
14 Zhang Y,Wang J,Shi S K,et al.Effect of aging on electrochemical corrosion behavior of 2205duplex stainless steel in sulfur environments[J].J Chin Soc Corros Protection,2012,32(6):496(in Chinese)张雨,王均,石树坤,等.时效对2205双相不锈钢在硫环境下的电化学腐蚀行为[J].中国腐蚀与防护学报,2012,32(6):496