René80超合金在600-800℃之H2/H2/S及H2/H2S/H2O混合氣氛下高溫腐蝕行為

High-temperature Corrosion of Rene 80 Superalloy in H2/H2S and H2/H2S/H2O Gas Mixtures at 600-800℃

李志誠(C. C. Lee) ； 劉智忠(C. C. Liu) ； 開物(W. Kai)

《防蝕工程》 19卷2期 (2005/06) Pp. 187-198

https://doi.org/10.6376/JCCE.200506.0187

摘要

本文探討鎳基超合金René 80於600-800℃之H2/HS及H2/H2S/H2O混合氣氛之腐蝕行為，研究結果顯示René 80之高溫硫化皆遵守拋物線型定律，硫化速率隨溫度之上升而加快，且H2/H2S混合氣氛之腐蝕速率與H2/H2S/H2O混合氣氛下蝕、腐蝕速率相差不大。René 80在兩種不同氣氛下腐蝕後皆生成內、外兩層的腐蝕物，包括外層的硫化鎳(Ni3S2)及少量的硫化鈷(Co9S8/Co6S5)，內層主要為硫化鉻(Cr2S3/Cr3S4)、硫化鎳鉻(NiCr2S4)、硫化鈷鉻(CoCr2S4)、硫化鎳(Ni3S2)，由白金指標實驗得知，白金位置皆位於腐蝕物內、外層之間，可知外層主要是因為陽離子向外擴散所致，而內層則主要是陰離子往內擴散的結果。

關鍵字

René 80超合金 ； 高溫腐蝕 ； 硫化鎳鉻 ； 硫化鈷鉻

並列摘要

The high-temperature corrosion behavior of René 80 Superalloy was studied over the temperature range 600-800℃ in H2/H2S and H2/H2S/H2O gas mixtures. In general, the corrosion kinetics followed the parabolic rate law, the corrosion rate constants increased with increasing temperature. The scales formed on René 80 were duplex, consisting of an outer layer of Ni3S2 and some Co9S8Co6S5, and an inner layer of mostly Cr2S3/Cr3S4, some NiCr2S4, CoCr2S4, and Ni3S2. The position of Pt-marker was always located at the inner- and outer-layer boundary, suggesting that the outer layer grew by outward diffusion of cations and the inner layer formed by means of inward diffusion of sulfur.

並列關鍵字

René 80 superalloy ； High-temperature corrosion ； NiCr2S4 ； CoCr2S4