Diatomite@MoS₂ Nanocomposite Layers as Composite Coating Targeting for Mg Alloys Endowed with Properties of Anticorrosion and Antiwear

Abstract

Molybdenum disulfide (MoS 2 ) demonstrates promising applications in enhancing the corrosion and wear resistance of metals, but the susceptibility of this nanomaterial to agglomeration hinders its overall performance. In this study, the externally assisted corrosion inhibitor sodium molybdate (SM) was successfully constructed in diatomaceous earth (DE) and molybdenum disulfide (MoS 2 ). This not only served as a molybdenum source for MoS 2 but also enabled the preparation of DE@MoS 2 -SM microcapsules, achieving a corrosion inhibitor loading of up to 23.23%. The corrosion testing reveals that the composite coating, when compared to the pure epoxy coating, exhibits an impedance modulus 2 orders of magnitude higher (1.80 × 10 9 Ω•cm 2 ), offering prolonged protection for magnesium alloys over a 40 day period. Furthermore, a filler content of 3% sustains a coefficient of friction (COF) at 0.55 for an extended duration, indicating commendable stability and wear resistance. The protective performance is ascribed to the synergistic enhancement of corrosion and wear resistance in the coatings, facilitated by the pore structure of DE, the high hardness of MoS 2 , and the obstructive influence of Na 2 MoO 4 . This approach offers a straightforward and efficient means of designing microcapsules for use in corrosive environments, whose application can be extended in industrial fields. In particular, we promote the application of nautical instruments, underwater weapons, and seawater batteries in the shipbuilding industry and marine engineering.

Satisfactory Tensile Strength and Strain of Recyclable Polyurethane with a Trimaleimide Structure for Thermal Self-Healing and Anticorrosive Coatings

“…Corrosion is a kind of natural reaction that brings about serious deteriorations of metal materials used for industrial infrastructures, such as thermal power plants, bridges, automobiles, railways, etc. − Although polymer coatings are effective to prevent corrosion by limiting the interactions between metallic substrates and aggressive media, the service lives of the anticorrosive coatings are readily shortened by the external mechanical and chemical damages during applications. − Especially, the formation and propagation of cracks in coatings result in significant reduction in their mechanical performances and anticorrosion abilities. − In this regard, developing self-healing coatings that can quickly repair cracks is necessary.…”