Acid-resistant organic coatings for the chemical industry: a review

Abstract

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Simultaneous acid exposure and erosive particle wear of thermoset coatings

“…Detailed explanations and studies into physical and chemical degradation of organic coatings are covered in [2].…”

“…The added stress of low pH exposure decreases the erosion resistance of all selected coatings by reacting with the resin and/or fillers. In a recent review [2], certain functional groups in cured coating resins were reported as vulnerable to acidic hydrolysis, which would cause chain scissoring in the resin matrix and thus change surface mechanical properties. These groups include amine linkages in NE1, urethane linkages in PU, and ester bonds in VE.…”

“…Kelley [1] estimated costs of material and installation of fiberglass-reinforced plastic (FRP) constructions in 2010, to 1000 $/m 2 , compared to 3000 $/m 2 for an alloy material with similar acid resistance. A comprehensive study of acid resistant inorganic and organic materials can be found in a recent review paper [2].…”

“…There are many industries where acid-resistant organic materials have potential as protective coatings. Examples include chemical transport in rail-car tanks, wet desulfurization plants and sour sewage treatment [2]. Also metal refining processes utilize acids, specifically agitated leaching of copper ore, where diluted sulfuric acid is used to dissolve copper-rich minerals [3].…”

THE EFFECT OF SEALING PROCESSES ON THE CORROSION BEHAVIOUR OF Al₂O₃-13 WT.%TiO₂ COATING

“…As a mature technology, thermal spraying process has been widely used to deposit ceramic coatings on different metals, such as steels [4,5,6], irons [7], aluminium alloys [8], superalloys [9] to protect the substrate from wear [10,11], corrosion [12], thermal fatigue [13] and cavitation erosion [14] for a long service life. Oxide ceramics, due to their excellent properties including high hardness, high chemical inertness [13,14] in a variety of aggressive environments [15], and good wear resistance, are promising candidates as corrosion-resistant coatings in industrial applications, although there are some inevitable defects in the coatings [16,17]. Generally, the defects come from unmelted particles, inadequate flow or fragmentation of molten particles under impact status, shadowing effects caused by an improper spraying angle, and entrapped gas [18].…”