摘要
通过电化学阻抗技术、极化曲线和浸泡腐蚀实验对Incoloy 825合金在不同浓度NH4Cl溶液中的腐蚀行为进行了研究。研究结果表明:开路电位随着浓度的升高而负移,腐蚀倾向增大;采用等效电路RS(Q1R1)(QdlRt)对电化学阻抗谱进行拟合,电荷转移电阻Rt随浓度增加而减小,Incoloy 825合金的维钝电流密度和腐蚀速率随浓度的增加而增大;825合金的腐蚀形貌主要为局部腐蚀,点蚀的密集度和大小随浓度的增加而增大;EDS结果表明Cl-参与了电化学反应过程。
The corrosion behavior of Incoloy 825 alloy was investigated in the different concentration of NH 4 Cl solution by electrochemical impedance spectroscopy (EIS),polarization curve measurement and immersion corrosion test.The results show that the open circuit potential shifts negatively with the increase of concentration of NH 4 Cl solution,i.e., the corrosion tendency increases.The equivalent circuit of R S (Q 1 R 1 )(Q dlR t )is used to fit the electrochemical impedance spectra.The EIS result reveals that the charge transfer resistance R t decreases with the increasing of NH 4 Cl solution concentration, meanwhile the passive current density and corrosion rate of Incoloy 825 alloy increases.The corrosion morphologies of the alloy are mainly localized corrosion,the intensity and size of pits increase with the increase of solution concentration.The results of EDS show that Cl- involves in the electrochemical reaction process.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第S2期255-261,共7页
CIESC Journal
基金
国家自然科学基金项目(51501164)
浙江理工大学科研启动基金项目(15022014-Y)~~
