Naik Gajanan M, Sharma Priyaranjan, Anne Gajanan, Pittala Raj Kumar, Kumar Rahul, Satapathi Gnane Swarnadh, Kumar Ch Sateesh, Fernandes Filipe
Department Mechanical Engineering, RV Institute of Technology and Management, Bengaluru 5680076, Karnataka, India.
Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, Vijayawada 522502, Andhra Pradesh, India.
Materials (Basel). 2023 Oct 11;16(20):6651. doi: 10.3390/ma16206651.
Mg AZ80/91 alloys are highly popular due to their lightweight, high strength-to-weight ratio, and good machinability. However, their moderate mechanical properties and corrosion resistance have limited their use in the automotive, aerospace, and defense sectors. This study primarily aims to enhance the mechanical performance and corrosion resistance of Mg AZ80/91 alloys, making them more suitable for applications in the aerospace and automotive industries. Firstly, equal-channel angular pressing (ECAP) of Mg AZ80/91 alloys has been attempted to improve their mechanical properties. Secondly, a high-velocity oxy-fuel (HVOF) coating of SS316 was applied over the Mg AZ80/91 substrate to enhance its corrosion resistance. In the second step, an HVOF coating of SS316 is applied over the Mg AZ80/91 substrate for better corrosion resistance. The experimental findings demonstrate that the application of an SS316 coating on the ECAP-4P AZ80/91 Mg alloy substrate results in a uniform and dense layer with an average thickness of approximately 80 ± 5 µm. The HVOF-based SS316 coating on 4P-ECAP leads to a noteworthy enhancement in microhardness and a reduction in the corrosion rate, especially in a NaCl solution (3.5 wt.%). This improvement holds great promise for producing reliable, long-lasting, and resilient automotive, aerospace, and defense components. The application of an HVOF-based SS316 coating onto the AZ80 Mg alloy, which had not undergone ECAP treatment, led to a substantial enhancement in corrosion resistance. This resulted in a notable decrease in the corrosion current density, reducing it from 0.297 mA/cm to 0.10 µA/cm.
镁 AZ80/91 合金因其重量轻、强度重量比高和良好的可加工性而广受欢迎。然而，它们中等的机械性能和耐腐蚀性限制了其在汽车、航空航天和国防领域的应用。本研究主要旨在提高镁 AZ80/91 合金的机械性能和耐腐蚀性，使其更适合在航空航天和汽车工业中应用。首先，尝试对镁 AZ80/91 合金进行等通道转角挤压（ECAP）以改善其机械性能。其次，在镁 AZ80/91 基体上施加 SS316 的高速氧燃料（HVOF）涂层以提高其耐腐蚀性。在第二步中，在镁 AZ80/91 基体上施加 SS316 的 HVOF 涂层以获得更好的耐腐蚀性。实验结果表明，在 ECAP-4P AZ80/91 镁合金基体上施加 SS316 涂层会形成一层均匀致密的涂层，平均厚度约为 80±5 µm。4P-ECAP 上基于 HVOF 的 SS316 涂层导致显微硬度显著提高，腐蚀速率降低，尤其是在 NaCl 溶液（3.5 wt.%）中。这一改进对于生产可靠、耐用和有弹性的汽车、航空航天和国防部件具有很大的前景。在未经过 ECAP 处理的 AZ80 镁合金上施加基于 HVOF 的 SS316 涂层，导致耐腐蚀性大幅提高。这使得腐蚀电流密度显著降低，从 0.297 mA/cm 降至 0.10 µA/cm。
