발간논문

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Vol.33, No.12, 1565 ~ 1571, 1995
Title
Hot Salt Corrosion of Ni and Ni - base Superalloys in Na2SO4 Melt
김종집Jong Jip Kim, 조성문Seng Mun Cho
Abstract
The hot salt corrosion of 99.995% pure Ni. IN-100 and IN-713LC alloys by Na₂So₄ melt has been studied at 910℃ in Pt catalyzed 0.2% SO₂-O₂ gas atmosphere. The values of corrosion current density Icorr., measured by the Tafel method increased in IN-100 and IN-713LC alloys after galvanostatic treatment, but decreased in Ni. These effects were interpreted in terms of the change n the basicity of the melt and the protectiveness of the oxide scale during polarization. The values of Icorr. measured after galvanostatic treatment were found to have a correlation with the parameters such as the activation potential and the stabilized potential after the cathodic treatment. However, these parameters and the Icorr. values measured either prior to or after galvanostatic treatment did not correlate well with the long term corrosion resistance of the alloys.
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