Co-Al兩元合金在H2/H2S/H2O混合氣氛之高溫腐蝕行爲

High-temperature Corrosion of Co-Al Binary Alloys in H2/H2S/H2O Gas Mixture

杜宗附(C. F. Du) ； 洪佳博(C. P. Hung) ； 開物(W. Kai)

《防蝕工程》 19卷2期 (2005/06) Pp. 199-212

https://doi.org/10.6376/JCCE.200506.0199

摘要

本研究主要探討Co-Al合金(含Co-0、2、5、10wt.%Al)在600-800℃之H2/H2S/H2O混合氣氛之高溫腐蝕行爲。萬賴俱寂結果顯示，Co-Al 合金之腐蝕動力學皆遵守抛物線型定律，且腐蝕速率隨Al含量增加而降低，但CO-5Al與Co-10Al700℃-800℃間有動力學逆轉現象；Co-Al合金腐蝕後，其結果發現生成內、外兩層的腐蝕物，包括外層的硫化鈷(Co9s8)及內層爲複雜的硫化鋁(Al2S)、氣化名(Al2O3)及小量的硫化鈷(Co9S8)。

關鍵字

Co-Al合金 ； 高溫腐蝕 ； 動力學逆轉 ； Al2O3 ； Al2S3 ； Co9S8

並列摘要

The high-temperature corrosion behavior of Co-Al binary alloys (containing Co-2, 5, and 10wt.% Al) was studied over the temperature range 600-800℃ in H2/H2S/H2O gas mixture. Generally, the corrosion kinetics of all the alloys followed the parabolic rate law, and the corrosion rate decreased with increasing Al content. The kinetics inversion was observed between 700 and 800℃ for higher Al alloys (＞5%Al). The scales formed on the alloys were duplex, consisting of an outer-layer of Co9S8 and of an inner-layer of mostly Al2S2, AL2O3, and minor amounts of Co9S8.

並列關鍵字

Co-Al binary alloys ； High-temperature corrosion ； Kinetics inversion ； Al2O3 Al2S3 ； Co9S8