Abstract
During hot corrosion the deposited molten salt layer dissolves some of the surface metal. This enters the melt as sulphato complexes of transition metal ions. Each complex has a unique electron absorption spectrum, and hence the identity and concentration of each complex formed can be obtained as a function of time. Electronic Absorption Spectroscopy (EAS) is a modification of standard chemical measurements which enables dissolution rates of metal into melt to be measured continuously under well-simulated industrial conditions, including a heat flux. The system, and its basis, is described, and examples are given for nickel and chromium, together with preliminary results for the superalloy, IN 738. Some of the special advantages of using EAS for obtaining mechanistic and other information relating to hot corrosion are also described, and examples are given.
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