Corrosion Behavior of Pure Ti under a Solid NaCl Deposit in a Wet Oxygen Flow at 600 °C

Lei Fan,Min Cao,Ying Li,Zhongfen Yu,Minghui Chen,Li Liu,Fuhui Wang

doi:10.3390/met6040072

Abstract

The corrosion behavior of pure Ti under a solid NaCl deposit in a wet O2 flow at 600 °C has been studied. The results showed that the corrosion rate was greatly accelerated by solid NaCl, which destroyed the compact and protective TiO2 scale to yield non-protective N4Ti5O12 and other products. Detailed scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDX), and X-ray diffraction (XRD) analysis showed that, during the corrosion process, the metal (Ti) diffused outward rapidly and reacted with the wet O2 to form a thick and porous corrosion products scale. The electrochemical reaction was also observed during the whole corrosion process at 600 °C, which further accelerated the corrosion rate. A possible mechanism has been proposed for pure Ti covered with a solid NaCl deposit in wet O2 at 600 °C, based on the experimental results.

Highlights

It is widely known that compressor blades suffer more serious corrosion when serving in a marine condition than in an inland condition
The results demonstrate that the corrosion rate of pure Fe and pure Cr is sensitive to the presence of a solid NaCl deposit layer because the solid
The material used in this study was pure the consumption of metal (Ti), and the samples were cut into pieces of 10 mm 15 mm 2 mm

Summary

Introduction

It is widely known that compressor blades suffer more serious corrosion when serving in a marine condition than in an inland condition. Compressor blades would suffer serious corrosion in the simultaneous presence of a solid NaCl deposit layer and wet air. Under this combined effect of NaCl and wet O2 at 500–700 ̋ C, the corrosion behavior of several alloys, including Fe-Cr alloys [1], 1Cr11NiW2MoV steel [2], 304 stainless steel [3], and K38G alloy [4], has been extensively studied. The results demonstrate that the corrosion rate of pure Fe and pure Cr is sensitive to the presence of a solid NaCl deposit layer because the solid

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Results

Conclusion