| Autor: |
Ajiriyanto, Maman Kartaman, Kriswarini, Rosika, Sungkono, Sungkono, Bayquni, Muhammad Ilham, Sihotang, Juan Carlos, Ismarwanti, Sri, Supriyadi, Supriyadi |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2024, Vol. 2967 Issue 1, p1-7, 7p |
| Abstrakt: |
Zircaloy-4 is a material used in the nuclear industry as a cladding material for the PWR (pressurized water reactor) type nuclear reactor. The corrosion behavior of the anodized layer on Zr-4 substrate in 2000 ppm LiOH was analyzed. The anodization process with various voltages has been carried out at 20 and 25 V. Electrolytes for the anodizing process consisted of (NH4)2SO4 and NH4F. The effects of the anodizing voltage on the microstructure, phase composition, elemental distribution, and corrosion resistance of the coatings were investigated by scanning electron microscopy (SEM-EDS), X-ray diffraction (XRD), and potentiodynamic polarization. The results showed that the morphology of the surface changed after anodizing treatment at the voltage of 20 and 25 V. Elemental composition of all coated samples consisted of Zr and O with different concentrations. Anodizing treatment improved its corrosion resistance and mechanics, especially hardness. The morphology of the oxide layer was zirconia tubular with random directions. An increase in anodization time from 5 to 20 minutes could increase the thickness of coatings. All the coatings showed a similar phase structure with the main phase of monoclinic ZrO2 and less tetragonal ZrO2 phase. All oxide films showed improved corrosion resistance in 2000 ppm LiOH, as indicated by lower corrosion current density and passive corrosion potential compared to the zirconium substrate. The corrosion resistance of coatings was better than that of Zr-4 bare. The corrosion potential changed from –0.512 V of bare Zr-4 alloy to -0.214 V of Zr-4 alloy coated. The oxide layer fabricated in 20 and 25 V shows lower corrosion current density, which displays better corrosion resistance. Corrosion current density of Zr-4 substrate and anodized at 20 V for 5, 10, and 20 minutes were 2.39x10−1; 2.1x10−1; 1.5x10−1 and 1.8x10−1 μA/cm2, respectively. Corrosion current density of Zr-4 anodized at 25 V for 5, 10, 20 and 30 minutes were 4.16x10−2; 1.94x10−1and 8.44x10−2 μA/cm2, respectively. The best corrosion resistance was obtained by anodizing at 25 V for 5 minutes, which is 5.16x10−2 μA/cm2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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