Novel Environmentally Friendly Waterborne Epoxy Coating with Long-Term Antiscaling and Anticorrosion Properties

Abstract

Metal pipes in industrial production are exposed to various corrosive ions. The combined action of these ions with oxygen in water causes corrosion and contamination of the metal pipes and equipment. In addition, metallic ions in water react with anions to form scale on the surface of the metal, which significantly reduces the service life of the metal and equipment, resulting in safety hazards. Waterborne coatings have attracted tremendous attention due to the less negative impact on the environment, but their practical applications are severely restricted by poor barrier properties and poor mechanical durability. Herein, the barrier properties of water-based coatings are successfully improved by adding functional slow-release nanofillers, and the fillers also endow the coating with excellent antiscaling properties. A functional slow-release nanofiller (lecithin/SiO 2 /HEDP) was prepared using HEDP (etidronic acid) as the scale inhibitor active material and SiO 2 as the carrier, combined with a phospholipid membrane with slow-release permeability. With the addition of slowrelease fillers, compared with the EP coating, the impedance modulus of composite coatings increases about 1 order of magnitude, the scale inhibition rate is as high as 80.7%, and the antiscaling life is double that of the coating without the phospholipid-coated filler. Thus, this study is expected to provide a new perspective for the preparation of new slow-release fillers and high-efficiency scale inhibitor coatings.

Inhibitors Incorporated Into Water-Based Epoxy Coatings on Metals for Corrosion Protection: A Review

“…The rate of loading of sodium phytate was found to be 25.79 wt% and the fastest release was observed at a pH of 9 [101]. The slow-release of nanofiller Lecithin-SiO2-Etidroic acid introduced into WEP coating was analyzed by Wang et al The synthesized nanofiller showed one order greater magnitude of impedance with the maximum inhibition efficiency of 80.7% [102]. Different corrosion inhibitors incorporated into various nanocontainers/microcontainers are illustrated in Table 3.…”

Sustainable scale resistance on a bioinspired synergistic microspine coating with a collectible liquid barrier

“…Due to the multiple advantages such as good formability, and chemically inert and oil-absorbing properties, 41 polydimethylsiloxane (PDMS) was firstly selected to prepare a microspine To ensure that all values are comparable, scale-resistant performance is evaluated by comparing scale mass gain or coverage percent on the tested surface with that on the control surface after testing in a scaling solution. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][33][34][35][36][37][38] coating with a hexagonal array and rough microgrooves (Fig. S2b, ESI †).…”

“…7,8 However, conventional scale-resistant strategies, such as mechanical descaling 9 and chemical detergents 10 often bring about plant shutdown and environmental pollution. Alternatively, superwettable surfaces 11 as functional coatings, such as superhydrophobic surfaces, [12][13][14][15][16][17][18][19][20][21][22] superhydrophilic surfaces 23 and liquid-infused surfaces, [24][25][26][27] have shown improved anti-scaling performance by mainly tuning the surface energy and surface morphology. In actual oil recovery and transportation, the produced water is often composed of complex multi-phases including oil products, water, salt ions and scales.…”

“…For example, the superhydrophobic PFSC-EDTA coating can improve scale resistance by 88.6% under static conditions. 21 Compared with them, [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][33][34][35][36][37][38] our BLOCK coating apparently surpasses the others in terms of scale-resistant performance and longevity (ca. 98% reduction vs stainless steel for 840 h).…”

“…(d) Summary of scale-resistant performance on different surfaces: the red region is from this work and others represent the values in reported literature. The data were classified by the combination of test conditions, surface wettability and control surface.To ensure that all values are comparable, scale-resistant performance is evaluated by comparing scale mass gain or coverage percent on the tested surface with that on the control surface after testing in a scaling solution [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][33][34][35][36][37][38]. Scale bars, 200 mm (b); 20 mm (c).…”