SAMUDRA, GERIA DWI (2026) PENGARUH TIMAH (Sn) TERHADAP LAJU KOROSI PADA MATERIAL FULL HEUSLER Fe2CrAl1_xSnx. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Full Heusler material is a promising candidate for corrosion-resistant applications in aqueous environments due to the ability of Al and Cr to form a protective layer on its surface. However, the effect of tin (Sn) substitution on the corrosion resistance of this material is still not well understood. This study aims to analyze the effect of Sn composition variation (x = 0; 0.05; 0.1) on the corrosion rate, diffusion coefficient, and electrochemical impedance characteristics of the material in RO water and 3.5% NaCl solution. Testing was carried out using the potentiodynamic polarization (Tafel) method to measure the corrosion rate, Chronoamperometry to measure the diffusion rate, and Electrochemical Impedance Spectroscopy (EIS) to analyze the charge transfer resistance (Rct) at the metal-solution interface. The results show that the corrosion rate increased consistently with increasing Sn content in both media, from 0.0037 mmPY (x = 0) to 0.1198 mmPY (x = 0.1) in RO water, and from 0.0123 mmPY to 0.5766 mmPY in 3.5% NaCl solution. Chronoamperometry results showed that the diffusion coefficient increased with increasing Sn content, from 1.24 × 10⁻⁷ cm²/s (x = 0) to 2.05 × 10⁻⁷ cm²/s (x = 0.1) in RO water, and from 4.81 × 10⁻⁶ cm²/s to 6.58 × 10⁻⁴ cm²/s in 3.5% NaCl solution. Conversely, EIS results showed that the charge transfer resistance (Rct) decreased from 22.977 Ω to 15.575 Ω in RO water, and from 11.654 Ω to 7.500 Ω in 3.5% NaCl solution, indicating that the passive layer became increasingly imperfect with increasing Sn content. The 3.5% NaCl solution proved to be far more corrosive than RO water for all specimens due to chloride ion attack, which damaged the stability of the passive layer. This decline in corrosion resistance is attributed to the reduced amount of Al and Cr atoms forming the passive layer, as well as the electronegativity difference between Sn and the other alloying elements. The specimen without Sn substitution (x = 0) exhibited the best corrosion resistance and is most suitable for application in aqueous environments, both under pure water conditions and in chloride-containing environments. Keywords: Fe2CrAl1−
| Item Type: | Thesis (S1) |
|---|---|
| NIM/NIDN Creators: | 41322010005 |
| Uncontrolled Keywords: | Fe2CrAl1− |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin 600 Technology/Teknologi > 660 Chemical Engineering and Related Technologies/Teknologi Kimia dan Ilmu yang Berkaitan > 669 Metallurgy/Metal, Metalurgi > 669.6 Tin/Metalurgi Timah |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 02 Sep 2026 04:10 |
| Last Modified: | 02 Sep 2026 04:10 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/103564 |
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