研究了Fe-Al合金在500℃空气中ZnCl_2-KCl盐膜下的腐蚀行为.结果表明,与无盐膜氧化实验相比,合金在盐膜下发生了加速腐蚀,表面生成了疏松多孔的腐蚀产物,基体产生内腐蚀,其中Fe-25Al合金表面氧化铝膜甚至发生退化.合金加速腐蚀是由于腐蚀过程中氯化物沉积盐与合金表面的氧化膜反应产生氯所致.腐蚀随合金中Al含量的增加而减轻.基于热力学相图预测了合金在盐膜下可能发生的反应,并解释了合金发生加速腐蚀的机制.
The corrosion behavior of Fe-Al alloys below KCl-ZnCl_2 deposits in air was investigated at 500 ℃.Compared to their oxidation in air without salt deposits,all the examined alloys below chloride deposits experienced accelerated corrosion characterized by formation of porous corrosion products plus internal attack of matrix.particularly the degradation of alumina on Fe-25Al alloy.The enhanced corrosion was attributed to the formation of chlorine from the reaction of chlorides in the deposit with the oxide scale of alloy.The corrosion rate decreased with increasing Al content.The possible reactions between alloy component and chloride compounds were predicted on basis of phasestability diagrams and the mechanism on accelerated corrosion Was also interpreted.
参考文献
| [1] | Tsaur CC;Rock JC;Chang YY .The effect of NaCl deposit and thermal cycle on an aluminide layer coated on 310 stainless steel[J].Materials Chemistry and Physics,2005(2/3):330-337. |
| [2] | Li YS;Spiegel M;Shimada S .Corrosion behaviour of various model alloys with NaCl-KCl coating[J].Materials Chemistry and Physics,2005(1):217-223. |
| [3] | A. Zahs;M. Spiegel;H. J. Grabke .The influence of alloying elements on the chlorine-induced high temperature corrosion of Fe-Cr alloys in oxidizing atmospheres[J].Materials and Corrosion,1999(10):561-578. |
| [4] | Y.S. Li;Y. Niu;M. Spiegel .High temperature interaction of Al/Si-modified Fe-Cr alloys with KCl[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2007(4):1799-1815. |
| [5] | M. Spiegel .Salt melt induced corrosion of metallic materials in waste incineration plants[J].Materials and Corrosion,1999(7):373-393. |
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