Physico-tribocorrosion performance of epoxy/MoS2 nanocomposite coating

• Published in: Materials today communications 2025-01, Vol.42, Article 111219
• Main Authors: Ravi, Pravesh, Katiyar, Jitendra Kumar, Shravan Kumar, C.
• Format: Article
• Language: English
• Subjects: Corrosion Protection; Electrochemical Impedance Spectroscopy (EIS); Pin-on-Disc Test; Potentiodynamic Polarization; Wear Resistance
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2024.111219

This study demonstrates the addition of molybdenum disulphide (MoS2) particles to an epoxy matrix to enhance its wear and corrosion resistance. FTIR spectroscopy clearly showed absorbance peaks at 1124.94 cm−1 and 676.19 cm−1, which are linked to SO bonds and Mo-O bonds. This analysis demonstrated the effective addition of MoS2. Further, the crosshatch adhesion tests demonstrated robust coating adhesion towards the substrate for most of the samples, especially 0.25 wt% and 2.5 wt% concentration of MoS2, which showed the 5B rating. Furthermore, the wettability results showed the water contact angle of 66.42º when 1 wt% MoS2 was used. However, increasing MoS2 concentration beyond this level shows the hydrophilic nature of the coating, which influences the adhesion properties. Additionally, measuring the roughness of the surface showed that surfaces with higher amounts of MoS₂ were rougher, with EPMO1.5 % having the roughest surface at 0.55 microns. Moreover, the SEM analysis revealed the presence of macropores in the coatings, and the density of these pores increased as the concentration of MoS2 increased. However, the tribological investigations demonstrated a significant reduction in wear rate and coefficient of friction (COF) upon increasing the MoS2 concentration, thereby validating the material's capacity to enhance coating longevity. The electrochemical investigation further demonstrated that a concentration of 0.5 wt% of MoS₂ provided the most effective protection against corrosion, as evidenced by a low corrosion current and a high polarisation resistance. [Display omitted]