Abstract
This article investigates the crystal structure of a carbonaceous substance in contact with a metal. The interdiffusion of carbon and metal (e.g., selective transfer of carbon is observed) causes the adhesive deposition of solid carbonaceous matter on the metal surfaces of reactors during the processing of heavy petroleum resids. Embrittlement cracking and seats of intercrystallite corrosion result from the diffusional saturation of the metal with carbon. The results of experiments using a petroleum pitch indicate that if the cooling rate is not faster than the crystallization rate, then the adhesive strength of the pitch is greater.
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