铈
酒石酸盐
腐蚀
硝酸铈
硝酸盐
无机化学
组分(热力学)
化学
材料科学
冶金
有机化学
热力学
物理
作者
Minakshi Koundal,Chhaya Sharma,Ajay Singh
标识
DOI:10.1016/j.jre.2024.01.011
摘要
Cerium tartrate (CeTar), produced in this study by precipitating cerium nitrate with potassium sodium tartrate (KNaTar), was examined as a corrosion inhibitor. Weight loss tests show inhibition efficiency of 71.7 % with Ce(NO3)3 and 88.7 % with CeTar inhibitor for one-month exposure to mild steel in 7 g/L NaCl solution. The inhibition efficiency drops to 28.6 % with the former and remains around 87 % with the latter inhibitor after six months of exposure. Similar results from electrochemical testing indicate that the inhibition efficiency decreases by adding cerium nitrate. Still, the cerium tartrate inhibitor demonstrates a nearly constant inhibition efficiency for up to 30 d, i.e., ≈90 %. Electrochemical impedance spectroscopy (EIS) performed in these cases shows the following results: (i) with cerium nitrate, a film of iron and cerium oxide, which on prolonged exposure diminishes, and (ii) with cerium tartrate, the formation of a bimetallic film (Fe-tartrate-Ce) and a mixture of cerium hydroxide and iron oxide that protects steel for a longer duration. These inferences are based on the analyses of scanning electron microscopy/energy-dispersive X-ray analysis (SEM/EDAX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS), and Raman spectroscopy results.
科研通智能强力驱动
Strongly Powered by AbleSci AI