Effect of Incorporating MoS_2 in Organic Coatings on the Corrosion Resistance of 316L Stainless Steel in a 3.5 NaCI Solution

摘要

This study discusses a new coating method to protect type 316L stainless steel (SS) from pitting corrosion in high chloride environments. The SS surface was coated using a simple, eco-friendly method, and sunflower oil (SunFO) was used as a base coating and binder for MoS_2. The coated surface was observed using scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) and x-ray diffraction (XRD). Corrosion behavior was examined by open-circuit potential (OCP) measurement and electrochemical impedance spectroscopy (EIS) in an 3.5% NaCI solution. The SunFO coating with molybdenum disulfide (MoS_2) showed the highest corrosion resistance and coating durability during the immersion time relative to the bare 316L SS. The increased corrosion resistance is thought to be because of the interactions with the aggregations of the SunFO lamellar structure and M0S2 in the coating film, which acted as a high order layer barrier providing protection from the metal to electrolyte.