Effect of organic component(tartrate) addition on cerium nitrate's ability to inhibit corrosion of mild steel in NaCl solution  

作　　者：Minakshi Koundal Chhaya Sharma A.K.Singh 

机构地区：[1]Department of Applied Science and Engineering,Indian Institute of Technology Roorkee,Saharanpur Campus,Saharanpur,U.,247001,India [2]Department of Pulp and Paper Technology Indian Institute of Technology Roorke,Saharanpur Campus,Saharanpur,U.p,247001,India

出　　处：《Journal of Rare Earths》2024年第10期1995-2002,共8页稀土学报（英文版）

基　　金：funding agency University Grants Commission (UGC),Government of India,for giving a fellowship and other financial assistance for her Ph.D.thesis study。

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(NO_(3))_(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 fo rmer and remains around 8 7% 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 iro n oxide that protects steel for a longer duration.These inferences are based on the analyses of scanning electron microscopy/energydispersive X-ray analysis(SEM/EDAX),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron(XPS),and Raman spectroscopy results.

关 键 词：Cerium tartrate Cerium nitrate Corrosion inhibition Mild steel Inhibitor film characterization Rare earths 

分 类 号：TG174.42[金属学及工艺—金属表面处理]