BTA@MoS2/hydroxyapatite/ZIF8 self-assembled nanohybrid for designing multi-functional smart anti-corrosion system

Abstract

For the first time, a three components hybrid nanomaterials consisting of molybdenum disulfide (MoS2), hydroxyapatite (HAp), and zeolitic imidazolate framework8 (ZIF8) was utilized as a novel nanocontainer to build a smart anti-corrosion epoxy coating (Ep coating). This nanocontainer was loaded with Benzotriazole (BTA) to impart self-healing properties to the Ep coating and increase its durability against corrosion. To ensure that the filler was effectively synthesized, characterization tests including X-ray diffraction, FT-IR, BET, and TGA were conducted. EIS and polarization tests, conducted on the extract solution of BTA@MoS2/HAp/ZIF8, showed it had a high potential for reducing the corrosion of metals with a mixed inhibition mechanism. The EIS outcomes for the intact coatings suggested that an Ep coating's lifespan increased by including BTA@MoS2/HAp/ZIF8. Even after seven weeks of immersion in a 3.5% NaCl solution, it was able to keep |Z|f = 0.01Hz above 109.5. FE-SEM and EIS experiments revealed that the Ep coating filled with BTA@MoS2/HAp/ZIF8 exhibited self-healing properties after an artificial scratch creation. Incorporating BTA@MoS2/HAp/ZIF8 into the Ep coating enhanced the coating's adhesion properties and lowered adhesion loss by 78.4%. BTA@MoS2/HAp/ZIF8 could also reduce the diameter of cathodic disbondment by 68%.