Several high temperature alloys were evaluated for hot corrosion resistance at 1500 F (816 C) using a controlled atmosphere combustion furnace burning high sulfur diesel fuel. Modification of commercial alloys and binary Ni-Cr and Co-Cr alloys were also studied using this facility. An over-all analysis of corrosion data suggests that the optimum chromium content lies in the 20-30% range in binary alloys studied, and in commercial alloys somewhat lower chromium content can be tolerated. Significant improvements in corrosion resistance were achieved in the case of commercial alloy Udimet-700 by trace additions of lanthanum and yttrium. A high concentration of SO3 in the gas stream and presence of sulfate deposits were conducive to accelerated rates of attack.

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