Intergranular attack of stainless steels in kraft digester liquors
- Bacon Donaldson Consulting Engineers, Richmond, British Columbia (Canada)
An intergranular attack (IGA) problem in a type 304L stainless-clad (compound plate) kraft digester was investigated using both in-situ corrosion probes and laboratory autoclaves filled with alkaline digester liquors. IGA in digester liquors was found to depend on both the degree of sensitization of the stainless steel and on the corrosion potential. Clad plate which as-supplied had a small degree of sensitization was most negatively affected by heat treatment in the sensitizing range (600 C). The IGA process involved initial consumption of grain boundary carbides, then of the adjacent chromium-depleted zones and finally, complete consumption of the austenite grains, leaving behind a corrosion product rich in nickel sulfide. Anodic and cathodic protection, stainless steel weld overlay, and thermal spray coating were found to be effective measures for protection of sensitized stainless steel from IGA in digester liquors.
- OSTI ID:
- 272011
- Report Number(s):
- CONF-960389-; TRN: IM9635%%438
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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