Electrochemical study on hot corrosion behavior of aluminide diffusion coating deposited on inconel 713C superalloy

Subject Areas :

Esmaeil Taheri ¹ , Mehdi Verdian ^{2 *}

1 - Najafabad Branch, Islamic Azad University
2 - Najafabad Branch, Islamic Azad University

Received: 2018-04-07 Accepted : 2019-06-18 Published : 2019-05-22

Keywords: hot Corrosion, Inconel 713C, Diffusion aluminide coatings,

Abstract :

In this study, the hot corrosion resistance of diffusion aluminide coating on Inconel 713C was investigated using electrochemical techniques. In this regard, potentiodynamic polarization tests were performed at 750 °C in two kinds of molten salts. The former contained 70% sodium sulphate and 30% sodium chloride. The latter was composed of 70% sodium sulphate, 25% sodium chloride and 5% vanadium pentoxide. The phase composition and microstructure of coatings and corrosion products were investigated using XRD and SEM-EDS techniques. The results showed that in the presence of vanadium, the protection efficiency of coatings increased and a current-independent region was observed in anodic polarization curve. Here, a compact corrosion product layer was seen. In absence of vanadium, both coated and uncoated samples exhibited similar corrosion rates. However, in comparison to vanadium-containing environment, all samples showed lower corrosion rate. In this case, the coatings exhibited active anodic behavior. The corrosion products were porous and discontinuous in vanadium free environment.

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