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All Journal International Journal of Science and Engineering (IJSE)
Pius Sebleku
Research Center for Metallurgy, Indonesian Institute of Sciences, Serpong, Tangerang
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).
Pitting Corrosion of Ni3(Si,Ti)+2Cr Intermetallic Compound at Various Chloride Concentrations Gadang Priyotomo; Pius Sebleku; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (845.976 KB) | DOI: 10.12777/ijse.7.1.10-15

Abstract

The pitting corrosion of Ni3(Si,Ti) with 2 at% Cr containing two regions of a Ni3(Si,Ti) single-phase of L12 structure and a mixture phase of of (L12 +Niss) was investigated as function of chloride concentrations by using a polarization method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K.  The pitting corrosion of Ni3(Si,Ti) with and without the addition of aluminium and type C276 alloy were also studied under the same experimental condition for the comparison.  The pitting potential obtained for the Ni3(Si,Ti) with 2 at% Cr decreased with increasing chloride concentration.  The specific pitting potentials and the pitting potentials were decreased in the order of C276 alloy > Ni3(Si,Ti) > Ni3(Si,Ti) + 2Cr > Ni3(Si,Ti) + 4Al, which means that the pitting corrosion resistance of Ni3(Si,Ti) with 2 at% Cr was higher than Ni3(Si,Ti) with 4 at% Al, but lower than that of Ni3(Si,Ti).  A critical chloride concentration of Ni3(Si,Ti) with 2 at% Cr was found to be higher than that of Ni3(Si,Ti) with at% Al. In addition, the presence of high concentration for oxygen indicates the occurrence of pit formation.
Corrosion Behavior of Ni3(Si,Ti) + 2Mo in Hydrochloric Acid Solution Gadang Priyotomo; Pius Sebleku
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1574.546 KB) | DOI: 10.12777/ijse.6.1.39-42

Abstract

The corrosion behavior of Ni3(Si,Ti) + 2Mo intermetallic compound (L12 and (L12 + Niss) mixture region) has been investigated using an immersion test, polarization method and surface analytical method (scanning electron microscope and energy-dispersive X-Ray spectrometry) in 0.5 kmol/m3 hydrochloric acid (HCl) solution at 303 K.  In addition, the results obtained were compared to those of the L12 single-phase Ni3(Si,Ti) intermetallic compound and C 276 alloy.  It was found that Ni3(Si,Ti) + 2Mo had the preferential dissolution of L12 with a lower Mo concentration compared to (L12 + Niss) mixture region.  From the immersion test and polarization curves, Ni3(Si,Ti) + 2Mo and C276 showed the lowest corrosion resistance and the highest corrosion resistance in the solution, respectively.  From this work, It implied that unlike C276, Ni3(Si,Ti) +2Mo intermetallic compound was difficult to form a stable passive film in HCl solution as well as Ni3(Si,Ti) in the same solution.
Co-Authors Gadang Priyotomo Yasuyuki Kaneno Yasuyuki Kaneno