Development of a Novel, Impurity-Scavenging, Corrosion-Resistant Coating for Ni-Based Superalloy CMSX-4
Development of a Novel, Impurity-Scavenging, Corrosion-Resistant Coating for Ni-Based Superalloy CMSX-4
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DOI：
10.1007/s11085-022-10142-2
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发表时间：
2022-12-26
期刊：
影响因子：
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通讯作者：
Pedrazzini, S.
中科院分区：
文献类型：
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作者：
Pek, M. E.;Ackerman, A. K.;Pedrazzini, S.
硫是大气和环境污染中常见的杂质，具有高度腐蚀性，对喷气发动机中镍超合金的寿命有害。然而，硫清除涂层还有待探索。本研究成功地在镍基高温合金CMSX-4上电镀出稳定、均匀、具有除杂能力的Ni-Mn镀层。涂层的特征在于通过结合扫描透射电子显微镜和能量色散X射线光谱。沉积的最佳涂层厚度为> 600 nm。将涂覆的合金在550 ℃下暴露于腐蚀性盐混合物98%Na 2SO 4 - 2%NaCl 100小时，模拟发动机暴露条件，从而证明涂层成功地捕获硫并防止其扩散到下面的合金中。这项工作提出了一个有前途的发展，为防止工业环境中的硫引起的腐蚀，如燃气涡轮机发动机，其中的影响，硫扩散到块体合金可能会导致过早失效。
Sulfur, a common impurity arising from atmospheric and environmental contamination, is highly corrosive and detrimental to the lifespan of nickel superalloys in jet engines. However, sulfur-scavenging coatings have yet to be explored. Our study presents the successful development of a stable, uniform, impurity-scavenging Ni-Mn coating on Ni-based superalloy CMSX-4, through electroplating. The coating was characterised via combined scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy. An optimal coating thickness of > 600 nm was deposited. The coated alloy was exposed to corrosive salt mixture 98% Na2SO4-2% NaCl at 550 & DEG;C for 100 h, mimicking engine exposure conditions, thereby proving that the coating successfully trapped sulfur and prevented its diffusion into an underlying alloy. This work presents a promising development for the prevention of sulfur-induced corrosion in industrial setting such as gas turbine engine, where the effects of sulfur diffusion into the bulk alloy could lead to premature failure.