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EUROCORR 2020: ‘Closing the gap between industry and academia in corrosion science and prediction’ Part 2
Published in Corrosion Engineering, Science and Technology, 2021
D. J. Mills, D. Nuttall, L. Atkin
‘Metal dusting resistance of Alloy 699 XA tubes for applications in the petrochemical industry’ was described by R. Rodriguez (Tubacex Innovación, Spain). This nickel–chromium alloy (plus a small amount of aluminium) is used to manufacture seamless tubes. ‘Metal dusting’ is a form of pitting corrosion, occurring in carburising and reducing atmospheres between 450 and 800°C. Samples were subjected to a temperature of 620°C at a pressure of 18 bars in (v/o): CO: 47; H2O: 2; CO2: 4; H2: 47, interrupted every 100 h up to 500 h for weight measurement and microscopic examination. It was concluded that surface finish together with Cr and Al depletion have a strong impact on metal dusting resistance.