Corrosion sites and morphology of S-H2S-RSH

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S-H2S-RSH corrosion is also known as high-temperature sulfur corrosion, and its relevant characteristics are as follows: 1. Corrosion sites – This type of corrosion occurs mainly in areas of oil refining facilities where the temperature is above 240°C, including coking units, vacuum units, the heating furnaces in catalytic cracking units, the bottom of distillation towers and related pipelines, as well as heat exchangers and other equipment. The severity of corrosion is ranked as follows: the bottom system of the coking fractionator is the most severe, followed by the bottom system of the vacuum distiller, with the bottom system of the catalytic fractionator being the least severe. Corrosion is further exacerbated in areas with high fluid velocity, the presence of eddies, or liquid in the gas phase, such as pump impellers, pipeline elbows, and the feed section of distillation towers. II. Corrosion pattern: This type of corrosion is characterized primarily by uniform thinning due to chemical action; under the action of high-temperature hot oil, knife-edge-like thinning and localized corrosion perforation may also occur.