Reaction Mechanism of Fe-Cr Alloy with O2-SO2-SO3 Reaction
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摘要: 本文研究了Ni16Cr,Ni16Cr3AI、Ni16Cr3Ti及Ni16Cr2Nb等合金在700℃,常壓下于O2-10%(SO2+SO3)環境條件下硫化-氧化行為.通過X-射線衍射及掃描電鏡技術對腐蝕產物組成及形貌進行了觀察。在含有SO3的情況下,Nil6Cr合金腐蝕速度較快,加入2%的Nb,對其抗腐蝕性能無太大影響,加入3%的Al或Ti時的腐蝕速度明顯下降。主要腐蝕產物以初始合金表面為界分為內、外兩層。外層是NiO和Ni3S2的混合物,內層包括所有合金元素的氧化物和硫化物。整個反應中包含Ni由合金基體向腐蝕產物的外層擴散,以及硫和氧在相反方向上的遷移。腐蝕產物層中傳質分析表明,氧化物-硫化物混合產物層的組織形態,對控制整個傳質過程起著主要作用。Abstract: Sulfidation-oxidation behaviors of Ni16Cr, Nil6Cr3Ti, Ni16Cr 2Nb alloys have been studied at 700℃ in O2-10% (SO2+SO3). Corrosion products are observed and examined with X-ray diffraction and SEM. Under experimental condition, containing SO3 corrosion rate of Ni16Cr alloy is rapider. Nb has little effect on degradation of alloy. When alloy containes Al or Ti, the oxidation rate of these alloys is slower. Products of corrosion consist of two layers; external layer (NiO + Ni3S2) mixture and internal layer sulfids and oxides containing all test alloying elements.
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Key words:
- corrosion /
- Ni-Cr alloy /
- reaction mechanism /
- oxygen-sulfido system
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