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All Journal International Journal of Science and Engineering (IJSE)
Yasuyuki Kaneno
Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University 1-1 Gakuen-cho, Sakai, Osaka
Engineering

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Pitting Corrosion of Ni3(Si,Ti)+4Al Intermetallic Compound at Various Chloride Concentrations Gadang Priyotomo; Pius Sebleku; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 6, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1433.451 KB) | DOI: 10.12777/ijse.6.2.81-85

Abstract

The pitting corrosion of Ni3(Si,Ti) with 4 at% Al consisting of two regions of a Ni3(Si,Ti) single-phase of L12 structure and two phases of L12 and fcc Niss was investigated as function of chloride concentrations by using electrochemical method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K.  In addition, the pitting corrosion of Ni3(Si,Ti) and  type C276 alloy were also studied under the same experimental condition for comparison.  The pitting potential obtained for the Ni3(Si,Ti) with 4 at%Al decreased with increasing chloride concentration.  The specific pitting potential and pitting potential of Ni3(Si,Ti) with 4at%, Ni3(Si,Ti) and C276 were the lowest, the moderate and the highest, respectively, which means that the pitting corrosion resistance of Ni3(Si,Ti) was higher than Ni3(Si,Ti) with 4at% Al, but lower than that of C276.  A critical chloride concentration of Ni3(Si,Ti) with 4at% Al was found to be lower than that of Ni3(Si,Ti).  The Pitting corrosion of Ni3(Si,Ti) with 4at% Al occurred in the two phase mixture (L12 + Niss).
THE EFFECT OF ANNEALING TEMPERATURES AFTER THERMOMECHANICAL PROCESS TO THE CORROSION BEHAVIOR OF Ni3(Si,Ti) IN SULFATE SOLUTION Gadang Priyotomo; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2511.645 KB) | DOI: 10.12777/ijse.8.2.141-145

Abstract

The corrosion behaviour of the intermetallic compounds Ni3(Si,Ti) (L12: single phase), has been investigated using an immersion test, polarization method, scanning electron microscope in 0.5 kmol/m3 H2SO4 solution at 303 K.  Moreover, the corrosion behaviour of austenitic stainless steel type 304 was studied under the same experimental conditions as reference. It was found that the intergranular attack and uniform attack were observed on Ni3(Si,Ti) after thermomechanical and annealing processes (1173K and 1273K) respectively in the immersion test. From the immersion test and polarization curves, all annealed Ni3(Si,Ti) had less corrosion resistance compared to type 304. In addition, Ni3(Si,Ti) was difficult to form a stable passive film, but not for type 304.
Co-Authors Gadang Priyotomo Gadang Priyotomo Pius Sebleku