Fabrication of anti-corrosion casting polyurethane coatings with high degree of microphase separation using colloidal BaFe12O19 quantum dots as filler

Abstract

Although the degree of microphase separation (DPS) is an important parameter of cast polyurethane (CPU), there are few studies have explored the relationship between DPS and corrosion resistance performance of CPU coatings. By using DMF-coordinated colloidal barium ferrite quantum dots (BFOQD) as filler, this research found that the BFOQD can act as reactive sites to efficiently extract and aggregate the hard segments, significantly reducing the mass fraction of the hard phase in the soft phase (W_h), thereby enhancing the DPS and crosslinking density (CLD) of PU, and resulting a good anti-corrosion performance of the CPU coating. This study confirmed the high efficiency of quantum dots in the field of corrosion resistance due to their large specific surface area and highly reactivity, and pointed out that the uniform distribution and avoidance of agglomeration is a vital concern when using them. A series of studies also conducted to explore an appropriate ratio between the hard segment content and the filler content to optimize the corrosion resistance performance. It is hoped that the findings can provide useful information for industrial productions and mechanism exploration in the development of new anti-corrosion coatings.