Constructing Mechanochemical Durable Superhydrophobic Composite Coating towards Superior Anticorrosion

Abstract

Corrosion is an inevitable and thorny issue in various fields, resulting in materials degradation, environmental pollution, economic loss, and even emergency safety accidents. Owing to the special surface functions, superhydrophobic coatings are regarded as a promising strategy towards corrosion inhibition. However, the large‐scale and real‐world applications of superhydrophobic coatings are restricted by the mechanical and chemical weaknesses. Herein, a fluorine‐free dual‐layer microarc oxidation/superhydrophobic coating with mechanochemical stabilization is fabricated for corrosion protection. The dual‐layer coating maintains superhydrophobicity under ultraviolet irradiation (15 d), different pH values (1–14), different temperatures (0–100 °C) and abrasion test (180 cycles). Its impedance modulus at the lowest frequency is increased by more than six orders of magnitude than that of the pristine substrate, and the corrosion inhibition efficiency value is calculated as 99.999%. The enhancement of surface multifunctions is attributed to the synergistic effects of microarc oxidation layer and superhydrophobic layer. The as‐prepared robust dual‐layer coating with excellent properties is expected to have potential applications in material protection fields.

Superhydrophobic Composite Coating with Excellent Mechanical Durability

“…Figure 1e shows the structural features of the SiO 2 NPs and MXene flakes that were characterized by XRD. For the SiO 2 , we observed the diffraction peak at 22.1 • that corresponded to the typical (111) plane [25]. Four diffraction peaks appeared at 7.05 • , 14.33 • , 28.75 • , and 60.5 • corresponding to the (0002), (0004), (0008) and (110) plane of MXene, which were consistent with reports [26,27].…”

Improved Interfacial Interactions of Dip Coatings by In Situ Introducing Silica to Enhance Corrosion Resistance and Metal Bonding Strength

“…Figure a shows the impedance modulus at 0.01 Hz of the MEP+PTFE-1.5 g coating, MEP coating, and bare aluminium alloy substrate and the corrosion inhibition efficiency of the MEP+PTFE-1.5 g coating after varied hours of NaCl immersion to further understand the anticorrosion performance. The corrosion inhibition efficiency (CIE) of a coating is computed in the following manner − C I E false( % false) = ( R ct + R p ) − R normalc normalt normalo R ct + R normalp × 100 where R ct 0 and R ct are the inter-solution charge transfer resistance of the bare aluminium alloy substrate and the resulting coating, respectively. R p is used as a quantitative indicator of the barrier properties of a coating.…”

Corrosion-Resistant Organic Superamphiphobic Coatings

“…This is primarily attributed to the superamphiphobic coating, which serves as the topcoat layer, undergoing random settling, thereby forming a denser micro/nanostructure. Song et al [68] utilized a combined approach of electrodeposition and spray coating to prepare a non-fluorinated dual-layer micro-arc oxidation superhydrophobic coating. At the lowest frequency, its impedance modulus increased by more than six orders of magnitude, significantly surpassing the values of the original substrate.…”