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Development and Application of High Cr-High Si-Fe-Ni Alloys to High Efficiency Waste-To-Energy Boilers
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Experiences with Inconel 625 in Biomass and Waste Incineration Plants
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Hot Corrosion Monitoring of Waste Incineration Corrosion Processes Using Electrochemical Techniques
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Influence of Chlorine, Sulphur and Water Vapor on High Temperature Corrosion of Fe, Cr, Ni Alloys for Waste Incinerators
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Experiences with Inconel 625 in Biomass and Waste Incineration Plants

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Abstract:

Inconel 625 is utilised in both biomass and waste incineration plants in Denmark. In both cases, the performance is good however the morphology of corrosion attack is different which indicates different corrosion mechanisms. In waste incineration plants there is general attack and shallow pitting, and in some cases dendritic attack especially on the fins of waterwalls. The dendritic attack is in the dendritic core. The presence of pits or dendritic attack is linked to the temperature of the metallic surface and the molten salt composition. In a woodchip biomass plant, chromium depletion was observed on the surface of the weld overlay leaving behind a nickel and molybdenum rich porous structure. The corrosion attack was not related to the dendritic microstructure of the weld. In two straw-fired biomass plants, co-extruded Sanicro 63 (alloy 625 type) as well as Inconel 625 weld overlay revealed the same type of attack, again chromium depletion. This indicates that the corrosion mechanism in woodchip and straw power plants are similar. Another interesting result in straw-fired boilers was that Nibas welds (alloy 625 composition) could provoke excessive corrosion in adjacent 18-8 stainless steels indicating a galvanic reaction. The corrosion mechanisms observed in each case are discussed in relation to temperature and corrosive environment.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

523-530

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.523

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Online since:

August 2006

Authors:

Melanie Montgomery, Ole Biede, Ole Hede Larsen

Keywords:

Biomass, Chlorination, Inconel 625, Molten Salt, Waste Incineration

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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