Corrosion Studies on Ss-321 in Natrium-Hydroxide Solution

Corrosion Studies On Ss-321 In Natrium-Hydroxide Solution. Experimental corrosionstudies on commercial SS-321 have been carried out. The experiments were carried out in a sodiumhydroxide medium with a concentration variation of 0.4 M. 0.5 M, 0.6 M, and0.7Mcorresponding topHvalues of 13.6, 13.69, 13.78, and 13.84 respectively. The experiments were carried out using a type ofM-273 EG&Gpotentiostat/galvanometer test instrument. The post-corrosion samples' microstructure wereanalyzed with the aid of EDS (energy dispersive spectroscopy) equipped SEM instrument to detect thepresence of any viable corrosion byproducts. Forfurther verification x-ray diffraction method was alsoused to detect any possible emerging corrosion byproducts on the samples' surfaces correlated to theSEM-EDS result. Experimental results confirm that A1SI-321 commercial alloys immersed in a natriumhydroxide corrosion medium with a variation of concentration experience very little or almost nocorrosion, so that according to the so-called Fontana's criteria these test-materials turn out to have anexcellent resistance toward natrium hydroxide corrosion. This is also evidenced by the very low corrosionrate value measured in this study. EDS study and X-ray diffraction results indicate that the possibleensuing corrosion byproducts are iron oxides, chromeoxides and silicon oxides

Li Ion Conducting Polymer Based On Polyvinylidene Fluoride And Li Triflate

Li ION CONDUCTING POLYMER BASED ON POLYVINYLIDENE FLUORIDE AND Li TRIFLATE. A Series of polymer electrolyte based on Polyvinylidene Fluoride (PVDF) for solid state rechargeable lithium battery has been prepared by solution casting technique. Lithium triflate salt was used as filler with various compositions. Bulk nature and surface morphology of the polymer electrolytes were studied by X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM), respectively. The thermal properties of polymer and salt were confirmed by Differential Scanning Calorimeter (DSC). The electrical properties of electrolyte polymer membrane were studied by using impedance spectrometer. It was found that the highest ionic conductivity was obtained for PVDF + Li Triflate 10%(w/w) which is 4.5411 x 10-3 S/cm. It was also found that there was peak of each composition in the loss tangent suggests the presence of relaxing dipoles in the polymer electrolyte films. The peak shifts towards higher frequency side suggesting the speed up of the relaxation time

Pembuatan Bahan Polimer Elektrolit Padat Berbasis Nanokomposit Kitosan Montmorillonite Untuk Aplikasi Baterai

Telah dilakukan pembuatan bahan polimer elektrolit padat berbasis nanokomposit kitosan montmorillonite yang diaplikasikan dalam sistem baterai. Penelitian ini dilakukan dengan tujuan untuk menentukan komposisi optimal antara kitosan, montmorillonite dan LiClO4 sehingga diperoleh membran dengan karakteristik yang paling baik. Teknik pembuatan membran dilakukan menggunakan metode casting. Terdapat dua seri sampel yang akan di uji, yaitu membran dengan variasi komposisi montmorillonite dan variasi komposisi LiClO4. Komposisi kitosan dan montmorillonite yang digunakan pada sampel seri kedua diperoleh dari komposisi optimal membran kitosan-montmorillonite pada sampel seri pertama. Karakterisasi yang dilakukan meliputi uji tarik, pengukuran konduktivitas ionik dan identifikasi menggunakan difraksi sinar X. Penambahan montmorillonite meningkatkan kuat tarik membran dan konduktivitas ionik setelah ditambah LiClO4. Pada kondisi optimal diperoleh konduktivitas ionik 2,383 x 10-5 S/cm dan kuat tarik 15,19 Mpa pada komposisi montmorillonit 5% b/b dan LiClO4 40%. Hasil analisis difraksi sinar X menunjukkan terjadi proses interkalasi polimer kitosan ke dalam montmorillonite

SINTESIS DAN KAJIAN PERILAKU KONDUKTIVITAS KOMPOSISI BARU ELEKTROLIT PADAT (Li2O)x(P2O5)y

A SYNTHESIS AND CONDUCTIVITY STUDY OF NEW COMPOSITION OF (Li2O)x(P2O5)y SOLID ELECTROLYTE. (Li2O)x(P2O5)y solid electrolyte with Li2O content x=24 and 28 wt%were prepared by solid reaction technique under the melting temperature. The prepared compounds were characterized using Scanning Electron Microscopy (SEM) and Electrochemical Impedance Spectroscopy measurements (EIS) in order to investigate theirmorphology, electrochemical properties, and conductivity behavior. The electrochemical characterization indicated that the conductivity value of the both compounds was in order of 10-6 S/cm, in the same order with that of Li4P2O7 that prepared at higher temperature with more Li2O content, and three order higher than that of Li3PO4 compounds. The value of evaluated power law exponent ofAC conductivity reveals that the long-range drift of ions may be one of the sources of ion conduction in the observed samples. The slope of dielectric loss indicates that the conduction in the samples were more predominantly DC conduction