Development of corrosion resistant thermal diffusion surface engineering for high-temperature recovery boilers

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The immediate industry problem that Endurance Technologies Inc. (ETI) and the University of Alberta wish to resolve under the auspices of this Engage Grant is the development of corrosion resistant coatings for use in high-temperature recovery boilers exposed to molten salts. In particular, the industry sponsor and the applicant will use thermal diffusion processes such as boronizing and aluminizing to fabricate iron borides (boronizing process) and aluminides such as iron-, nickel-, and chrome-aluminides. These coatings are expected to have high corrosion resistance at the high temperatures that are typically found in recovery boilers. The novelty of this proposed preliminary study will be the exposure of the coatings to molten salt corrosion, a feature that is also typical in recovery boilers. Thus, with coatings with more complex architectures and where a few protective layers are involved, the performance and feasibility of these novel coating systems will be determined.