Case of preferential uniform corrosion at the grain boundaries of the tray supports in the urea synthesis tower

2026-01-17View Original

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A tray support clip for a large-scale fertilizer urea synthesis tower, made of 316L material, and in use for over ten years. Corrosion characteristics: intergranular type, but this grain-edge corrosion does not penetrate deeply; it only reaches a depth of one or two grains, and the grains themselves are also corroded, resulting in uniform thinning. Corrosion rate: 0.1mm/a. It is normal corrosion. Conclusion: The material selection is appropriate. Some believe that this form of corrosion is different from classical intergranular corrosion and should be classified as uniform corrosion. It is called grain boundary-prioritized uniform corrosion.

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Case of preferential uniform corrosion at the grain boundaries of the tray supports in the urea synthesis tower

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