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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical and Corrosion Behavior of cast Re-containing Inconel 718 Alloys in Sulphuric Acid Solutions and the Effect of Cl-
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Electrochemical and Corrosion Behavior of cast Re-containing Inconel 718 Alloys in Sulphuric Acid Solutions and the Effect of Cl-

机译：铸造含Re Inconel 718合金在硫酸溶液中的电化学腐蚀行为以及Cl -的影响

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摘要

The effect of Rhenium (Re) additions (2.4, 3.5, and 6%) to a standard Inconel 718 alloy (IN718) on theuniform and pitting corrosion processes of IN718 was studied. Measurements were conducted in 1.0Mo H2SO4 solutions without and with 0.1M, 0.3M, or 0.6M NaCl at 25 C, employing variouselectrochemical techniques, complemented with SEM/EDS and AFM examinations. The corrosionbehavior at equilibrium (corresponding to immersion of samples without polarization) was studied as afunction of alloy composition by monitoring the open-circuit potential (OCP), electrochemicalimpedance spectroscopy (EIS) measured at the corrosion potential (Ecorr), and by polarization studiesaround Ecorr (Ecorr250 mV). The anodic behavior of the tested alloys was also studied in 1.0M H2SO4- solutions without and with Cl , based on potentiodynamic anodic polarization measurements. Apotentiostatic technique (current vs. time measurements at a given potential) was also employed to- access the role of the alloyed Re in the kinetics of pit initiation and growth induced by Cl .Experimental findings showed that the rates of the uniform and pitting corrosion processes decreasedwhen Re content increased from 2.5% to 3.5%. However, further increase in alloyed Re content (up to6%) has resulted in an obvious enhancement in the rates of uniform and pitting corrosion processes.- - Potentiostatic measurements in presence of Cl showed that nucleation of pit (initiated by Cl at anodicpotentials very close to and beyond the pitting potential, Epit) takes place after an incubation time (ti).-1 - The rate of pit nucleation (ti ) increases with increase in Cl concentration and applied anodic potential-1(Ea). The results of potentiostatic measurements also revealed that ti suppressed when Re content inthe alloy increased up to 3.5%, but enhanced in presence of 6%Re.Int. J. Electrochem.
机译：研究了标准Inconel 718合金（IN718）中添加的2.4（Re）（2.4、3.5和6％）对IN718均匀腐蚀和点蚀的影响。使用各种电化学技术，辅以SEM / EDS和AFM检查，在25℃下在不包含0.1M，0.3M或0.6M NaCl的1.0Mo H2SO4溶液中进行测量。通过监测开路电势（OCP），在腐蚀电势（Ecorr）下测量的电化学阻抗谱（EIS）以及通过围绕Ecorr的极化研究，研究了平衡状态下的腐蚀行为（对应于没有极化的样品浸没）与合金成分的关系。 （Ecorr250 mV）。根据电位动力学阳极极化测量结果，还在不含氯和含氯的1.0M H2SO4-溶液中研究了被测合金的阳极行为。还采用恒电位技术（在给定电势下电流与时间的测量值）来了解合金化的Re在Cl诱导的坑萌生和生长动力学中的作用。实验结果表明，均匀腐蚀和点蚀过程的速率当Re含量从2.5％增加到3.5％时降低。然而，合金中Re含量的进一步增加（最高6％）导致均匀腐蚀和点蚀的速率明显提高。--在Cl存在下进行恒电位测量表明，核的成核（由Cl在阳极电位处引发）非常接近达到和超过点蚀电位（Epit）在温育时间（ti）后发生。-1-坑成核速率（ti）随Cl浓度和施加的阳极电位-1（Ea）的增加而增加。恒电位测量的结果还显示，当合金中Re含量增加至3.5％时，ti受到抑制，但在6％Re.Int的存在下，ti被抑制。 J.电化学。

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