Abstract

In this study, a NiCoCrAlY + lanthanum zirconate multilayer thermal barrier coating was deposited on Inconel 738 through the thermal plasma spray technique. The coated samples subjected to hot corrosion testing at 900 °C for 240 h after coating them with 90 wt.% Na₂SO₄ + 5 wt.% NaCl + 5 wt.% V₂O₅. The corroded samples were evaluated using SEM, SED, XRD, microhardness and electrochemical study. The dominance of vanadium was observed in the form of LaVO₄ phase formation at the plates on the coating surface. The as-received coating sample, sample after the electrochemical test, sample after hot corrosion and hot-corroded sample after electrochemical test were tested for hardness. A significant decrease of 23.8% in hardness was measured after the electrochemical test of the corroded sample.

中文翻译：

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热腐蚀和电化学腐蚀对涂层显微硬度的影响

摘要

在这项研究中，通过热等离子喷涂技术在 Inconel 738 上沉积了 NiCoCrAlY + 锆酸镧多层热障涂层。涂覆样品在涂覆90 wt.% Na ₂ SO ₄  + 5 wt.% NaCl + 5 wt.% V ₂ O ₅后，在900 ℃下进行240 h的热腐蚀测试。使用 SEM、SED、XRD、显微硬度和电化学研究对腐蚀样品进行评估。在涂层表面的板中观察到以LaVO ₄相形成的形式观察到钒的主导地位。对涂层原样、电化学测试后样品、热腐蚀后样品和电化学测试后热腐蚀样品进行硬度测试。对腐蚀样品进行电化学测试后测得硬度显着下降了23.8%。