Corrosion resistance of AISI 310s stainless steel samples in lead melt at 450°C with limited oxygen access is studied. According to the results of corrosion tests, it is found that the dynamics of changes in the corrosion rate of AISI 310s steel shows a tendency to decrease from 0.474 mm/year to 0.045 mm/year with increasing test duration from 240 to 1440 h, respectively. Possibly, the change of the corrosion rate of AISI 310s steel is due to the formation of protective oxide films on the sample surface. According to the results of scanning and optical microscopy, the changes in the structure and composition of corrosion products formed on the surface with an increase in the duration of testing is shown. It was established that with test time increase to 720 h, a homogeneous and dense structure of the corrosion product layer is formed on the surface. The layer of corrosion products consisting of O, Si, Ca, Cr, Mn, Fe, Ni and Pb, formed after 240 h of testing, turns into a two-layer structure with a clear separation of layers that differ in composition. Thus, near the surface of the base metal, the layer of corrosion products consisted of O, Cr, Fe, Ni and Pb, and the layer in contact with the lead melt consisted of O, Cr, Fe and Pb. In addition, coagulation of carbides on the base metal and their precipitation along the grain boundaries and along the rolling lines after 720 h of testing is established. The microhardness of the base metal is 1650±50 MPa, 1855±45 MPa and 1730±60 MPa after 240, 720 and 1440 h of testing in lead melt, respectively, while the microhardness of the corrosion products is 3710±425 MPa and 3020±615 MPa after 240 and 720 h of testing, respectively.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 58, No. 5, pp. 30–35, September–October, 2022.
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Klymenko, A.V., Kovalenko, S.Y., Polishko, G.O. et al. Corrosion Resistance of AISI 310s Stainless Steel in Lead Melt at a Temperature of 450°C. Mater Sci 58, 591–596 (2023). https://doi.org/10.1007/s11003-023-00703-4
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DOI: https://doi.org/10.1007/s11003-023-00703-4