Volume 15, Issue 2 (9-2025)
مهندسی خوردگی 2025, 15(2): 40-40 |
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Corrosion Performance of High-Entropy AlCoCrFeNi Coating on Aluminum Alloy 5083 in NaCl Solution. مهندسی خوردگی 2025; 15 (2) :40-40
URL: http://journal.ica.ir/article-1-252-en.html
URL: http://journal.ica.ir/article-1-252-en.html
Abstract: (1 Views)
In this study, the corrosion behavior of an AlCoCrFeNi high-entropy alloy (HEA) coating deposited on an Al 5083-H321 aluminum alloy substrate was evaluated. For this purpose, the AlCoCrFeNi HEA coating was applied by radio frequency magnetron sputtering (RFMS) for deposition times of 30 and 60 minutes. The coatings were characterized in terms of microstructure, nanoindentation hardness, adhesion, and corrosion resistance using cyclic potentiodynamic polarization testing, as per ASTM G61. Microstructural observations revealed that the coatings produced at both deposition times consisted of a body-centered cubic (BCC) solid solution phase, along with an amorphous phase, exhibiting a uniform elemental distribution across both the coating surface and cross-section. Increasing the deposition time led to a higher fraction of the amorphous phase (38.06% vs. 26.89%) and a reduction in crystallite size (47.6 nm vs. 49.3 nm). This structural refinement resulted in enhanced mechanical properties, particularly an increase in hardness (from 2.57 to 5.06 GPa). Cyclic polarization tests in 3.5 wt.% NaCl solution demonstrated that the formation of a stable passive oxide layer enriched in Cr and Al decreased the corrosion rate significantly (from 2.709 to 0.598 mm/year). Furthermore, it was shown that increasing the deposition time reduced the density of surface defects and porosity, owing to the homogeneous distribution of crystalline and amorphous phases within the coating. Adhesion tests indicated that the coatings were classified in the HF2 category, exhibiting only minor microcracking around the indentation area. Overall, these results confirm the effectiveness of RFMS-deposited AlCoCrFeNi HEA coatings in improving the corrosion resistance of the Al 5083-H321 alloy substrate.
Keywords: High-entropy coating, AlCoCrFeNi, Al 5083-H321 substrate, radio frequency magnetron sputtering (RFMS), cyclic polarization
Type of Study: Research |
Subject:
General
Received: 2026/01/31 | Accepted: 2025/09/21 | Published: 2025/09/21
Received: 2026/01/31 | Accepted: 2025/09/21 | Published: 2025/09/21
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