The Effect of Mo addition in stainless steels on the corrosion behavior in the nano fluids contain Al2O3 nano particles

Abstract

The effects of molybdenum in stainless steel on the corrosion behaviour in nano fluids contain nano particle Al2O3 in the de mineralized water have been investigated. Open circuit potential (OCP), Tafel polarization and electrochemical impedance spectroscopy (EIS) testing was performed in the demineralized water contain nano particle 0, 01% Al2O3 as Nano fluid. Metallurgical techniques such as X-ray diffraction (XRD) and optical microscopy were used to characterize the alloys before and after corrosion testing. According to the open circuit potential measurement of the stainless steel in the de mineralized water and nano fluid media, it is showed that stainless steel with Mo showed more negative OCP compared without Mo stainless steel. The results of the Tafel polarization technique show that corrosion currents stainless steels in the nano fluid decrease with the increasing of Mo content in the stainless steel. Surface morphology of the specimens by optical microscope examination showed that microstructure of stainless steel SS 304 and SS 316 alloys relatively unchanged before and after corrosion testing nano fluids. X ray diffraction examination of stainless steel with and without Mo after corrosion testing depict that γFe is major phase without oxide phase on the surface of alloy.