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Corrosion of metals and alloys in molten glasses. Part 2: nickel and cobalt high chromium superalloys behaviour and protection

2004; Elsevier BV; Volume: 46; Issue: 8 Linguagem: Inglês

10.1016/j.corsci.2003.10.025

1879-0496

Jean Di Martino, Christophe Rapin, Patrice Berthod, Renaud Podor, Pierre Steinmetz,

Metallurgical Processes and Thermodynamics

Electrochemical methods have been used for the characterisation of high chromium alloys corrosion in molten glasses (cobalt and nickel base alloys in a borosilicate glass at 1050 °C, with rotating working electrodes). All the tested alloys are active but passivable materials. The active state is characterised by a rapid dissolution of the constitutive elements of the alloy in the glass melt. The passive state can be obtained by an air oxidation of the alloys (called preoxidation) or with a temporary anodic polarisation of the alloy. The obtained passive state is due to the presence of a thin protective chromia scale.