inconel625上的YSZ和YSZ/NiCo涂层暴露于碱性氯化物的腐蚀行为

Pub Date : 2024-06-04 DOI:10.55713/jmmm.v34i2.1879
R. D. Desiati, Eni Sugiarti, Bambang Hermanto, G. E. Timuda, H. Izzuddin, Fraya Aulia Salsabilla, A. Anawati
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引用次数: 0

摘要

在垃圾发电(WTE)行业中,锅炉管壁上的碱氯化物侵蚀被认为是主要的腐蚀问题,尽管该行业使用的是超级合金。为保护 Inconel 625 基材,采用了电泳沉积(EPD)钇稳定氧化锆(YSZ)涂层。YSZ 直接沉积在 Inconel 625 基材和 NiCo-Inconel 625 上。在 NaCl、KCl 和 CaCl2 等碱性盐介质中,使用 3.5%NaCl 电化学测试和 600°C 热盐腐蚀测试进行了耐腐蚀性测试。电位极化曲线显示,沉积在基底(单层)上的 YSZ 涂层的腐蚀速率为 0.065 mm∙y-1,低于沉积在 NiCo 涂层(双层)上的 YSZ 涂层。在双层镀层中,由于 NaCl 溶液被截留,NiCo 层中形成了 NiO2。同时,在 600°C 的热盐腐蚀中,会形成 CaCrO4 作为保护氧化层。此外,在双层中会形成不完美的氧化层,导致剥落和涂层失效。单层热盐腐蚀 40 小时的腐蚀速率为 0.310 mm∙y-1。因此,烧结过程中形成的 Cr2O3 氧化层提高了单层的耐腐蚀性。
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Corrosion behavior of YSZ and YSZ/NiCo coatings on inconel 625 exposed alkali chlorides
Alkali chloride attack on boiler pipe walls is considered the main problem of corrosion in the waste-to-energy (WTE) industry, even though uses superalloy. Electrophoretic deposited (EPD) yttria-stabilized zirconia (YSZ) coating is carried out to protect the Inconel 625 substrate. YSZ is deposited directly both on the Inconel 625 substrate and NiCo-Inconel 625. Corrosion resistance was conducted using the 3.5% NaCl electrochemical test and the hot salt corrosion test at 600°C in alkaline salt media such as NaCl, KCl, and CaCl2. The potentiodynamic polarization curve shows that the YSZ coating deposited on the substrate (single-layer) has a corrosion rate of 0.065 mm∙y‒1, lower than that deposited on NiCo coating (double-layer). The double-layer, NiO2 is formed in the NiCo layer due to the NaCl solution being trapped. Meanwhile, in hot salt corrosion at 600°C, CaCrO4 is formed as a protective oxide layer. Furthermore, in the double-layer, an imperfect oxide layer is formed causing spallation and coating failure. The corrosion rate for single-layer hot salt corrosion for 40 h is 0.310 mm∙y‒1. As a result, the corrosion resistance of the single-layer is increased by the presence of the Cr2O3 oxide layer formed during sintering.
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