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The marine coating in the tidal zone is crucial to restoring its protective function in the case of coating defects, mainly due to the structural damage of the coating by the alternation of wet and dry in the tidal zone and the surface damage of the coating by the impact of sand and gravel. Hydrophilic materials such as hydrogel transformed the tidal zone into an entire immersion zone. Due to the complexation of copper, the fouling problem can be effectively reduced. The coating (AAm/Alginate‐Ca/Cu‐BTA) has excellent mechanical properties (modulus: 200 kPa, toughness 128 J m−2) and significant adhesion (138 J m−2). Otherwise, herein, simultaneously mechanical tests of hydrogels at different temperatures and excellent mechanical properties (modulus: 160 kPa, toughness 100 J m−2) after 7 days of use in alternating dry and wet environments every 6 h are shown. It's proved that the coating has an excellent antifouling and anticorrosion effect. Meanwhile, theoretical study reveals the nature of the weak mechanical properties of hydrogel materials at low temperatures. This work provides an effective strategy for preparing hydrogel coatings with excellent mechanical properties and marine anticorrosion and antifouling. It also proves that hydrogels have broad application prospects in marine tidal zone by excellent water retention performance. [ABSTRACT FROM AUTHOR]

A strategy to improve the number of self-healing cycles of traditional coatings was proposed, in which photothermal nanomaterials were integrated into the self-healing coating to effectively adjust the photothermal response temperature of the coating. Herein, an interface adjustable photothermal heterojunction composed of Bi 2 MoO 6 and hydrothermal carbonation carbon (HTCC) was designed and integrated into polydimethylsiloxane (PDMS) to improve the photothermal self-healing efficiency of the coating. It is found that, by adjusting the interface combination degree, the heterojunction has a broader range of visible light absorption, more photogenerated electron hole pairs, a minor interfacial transfer resistance, and a longer lifetime of photogenerated electron hole pair, causing more photogenerated electrons and holes to have more chances to cross the heterojunction interface and release more heat. The photothermal tests indicate that the temperature of the PDMS-Bi 2 MoO 6 @HTCC-0.05 coating quickly reached about 75 °C and exhibited an excellent self-healing performance. The electrochemical tests demonstrate the multiple cycles self-healing performance of the PDMS-Bi 2 MoO 6 @HTCC-0.05 coating. In addition, the molecular dynamics calculation results also verified that the PDMS exhibited a higher level of self-healing performance after integrating Bi 2 MoO 6 @HTCC-0.05 nanosheets. The concept of adjustable photothermal response temperature coating will enrich the realization of multiple self-healing cycles. [Display omitted] • Interfacial controllable Bi 2 MoO 6 @HTCC were synthesized. • The photothermal response temperature can be controlled by interface. • The photocatalyst was successfully integrated into PDMS coatings. • The composite coating has cyclic photothermal self-healing performance. • The composite coating has superior corrosion protection. [ABSTRACT FROM AUTHOR]