The selection of materials resistant to molten tin at high temperatures

Abstract

1. Chromium steels, chromium steels with coatings, and chromium-nickel alloys are rapidly destroyed in liquid tin at 1100°C and cannot be used for operation in this medium. 2. Pure metals (chromium, molybdenum, tungsten) are the most resistant to liquid tin. 3. The depth of corrosion damage to metals in liquid tin at 1000–1100°C depends on the holding time and varies as follows: δ=46×10−8τ1.81 mm for tungsten; δ=2.2×10−4 τ mm for molybdenum; δ=1.12×10−2 τ mm for chromium. The average corrosion rate of molybdenum amounts to 2.2×10−4 mm/h (steady value) and that of chromium is 1.12×10−2 mm/h (steady value). 4. Coatings of molybdenum disilicide and boride increase the corrosion resistance of molybdenum in liquid tin. The average corrosion rate of molybdenum in this case is 1.2×10−4 mm/h. 5. Rotation of the coated samples in liquid tin induced erosion damage of the coatings. 6. Chromium, molybdenum, and tungsten are not wetted by tin at 500–1100°C.