Corrosion behavior of magnetic ferrite coating prepared by plasma spraying

• Spinel ferrite coatings have been prepared by plasma spraying.
• The coating consists of nanocrystalline grains.
• The saturation magnetization of the ferrite coating is 34.417 emu/g.
• Corrosion behavior of the ferrite coating was examined in NaCl solution.

In this study, spray dried spinel ferrite powders were deposited on the surface of mild steel substrate through plasma spraying. The structure and morphological studies on the ferrite coatings were carried out using X-ray diffraction, scanning electron microscope and Raman spectroscopy. It was showed that spray dried process was an effective method to prepare thermal spraying powders. The coating showed spinel structure with a second phase of LaFeO3. The magnetic property of the ferrite samples were measured by vibrating sample magnetometer. The saturation magnetization (Ms) of the ferrite coating was 34.417 emu/g. The corrosion behavior of coating samples was examined by electrochemical impedance spectroscopy. EIS diagrams showed three corrosion processes as the coating immersed in 3.5 wt.% NaCl solution. The results suggested that plasma spraying was a promising technology for the production of magnetic ferrite coatings.

The saturation magnetization (Ms) of the ferrite coating is 34.417 emu/g while the Ms value of the ferrite powder is 71.916 emu/g. It can be seen that plasma spray process causes deterioration of the room temperature soft magnetic properties.Figure optionsDownload as PowerPoint slide