Anti-Corrosion Reinforcements Using Coating Technologies—A Review

Abstract

Coated reinforcements are expected to improve the performance of reinforced concrete in aggressive environments, but different kinds of coated reinforcements can express a variety of properties, which can confuse researchers and engineers. This paper reviews the manufacture, corrosion mechanisms, behaviors, and applications of popular or promising coated reinforcements, incorporating galvanized reinforcements (GRs), epoxy coated reinforcements (ECRs), stainless cladding reinforcements (SCRs), and steel-fiber reinforced polymer composite bars (SFCBs). In terms of manufacture, GRs and ECRs should focus on minimizing the negative effect of manufacture on performance, while SCRs and SFCBs should reduce the cost and increase the production capacity. Behaviors of GRs and ECRs are primarily determined by the steel substrate, but the behaviors of SCRs and SFCBs are primarily affected by the coat and core, and their interaction. The corrosion mechanism of GRs and SCRs is about oxidation, while that of SFCBs is about hydrolysis. ECRs are usually corroded under film, which can be a cause of premature failure. Corrosion embrittles SCRs, as well as bare bars, but corrosion of SFCBs usually causes a reduction in maximum strength. The investigation of the corrosion behaviors of GRs and ECRs focuses on bond strength. GRs have controversial performance. ECRs have been proven to have drawbacks regarding bond strength. The use of anti-corrosion reinforcement is uneven in regions, which may correlate with the development of technology and the economy.

Study on the Effect of Additives on the Performance of Cement-Based Composite Anti-Corrosion Coatings for Steel Bars in Prefabricated Construction

“…Anti-corrosion coatings have been widely used in various construction fields due to their excellent corrosion resistance, easy application, and environmental friendliness. According to chemical composition, it can be divided into three main categories: organic coatings, inorganic coatings, and organic-inorganic composite coatings [15]. Organic coatings refer to coatings composed mainly of polymeric compounds as the film-forming materials, such as epoxy coatings, polyurethane coatings, and acrylic coatings.…”

Contributions to a More Realistic Characterization of Corrosion Processes on Cut Edges of Coated Metals Using Scanning Microelectrochemical Techniques, Illustrated by the Case of ZnAlMg-Galvanized Steel with Different Coating Densities

“…After nearly two centuries of use, galvanized steels retain their indispensable role in the automotive, industrial and construction sectors by providing a surface finish that improves service life thanks to barrier and sacrificial protection mechanisms [2,3]. However, although alternatives have been proposed [4][5][6], no universal system has emerged that can replace zinc-coated steels in the mass production of vehicle bodies, due to their combination of corrosion resistance, ductility, and cost-effectiveness.…”

Monitoring and Evaluation of the Corrosion Behavior in Seawater of the Low-Alloy Steels BVDH36 and LRAH36

“…In a world where metals and metal alloys are indispensable, corrosion appears as one of the most serious problems of modern society and the resulting losses every year are of the order of trillions of dollars [ 1 ]. Regarding the corrosion losses, approximately 90% are related to ferrous materials, used in the construction of road bridges, reinforcements, rolling stock and agricultural equipment, maritime ships, and port facilities [ 2 ]. In second and third place in the hierarchy of practical use are aluminum and copper alloys, which are also subject to corrosion [ 2 ].…”

“…Regarding the corrosion losses, approximately 90% are related to ferrous materials, used in the construction of road bridges, reinforcements, rolling stock and agricultural equipment, maritime ships, and port facilities [ 2 ]. In second and third place in the hierarchy of practical use are aluminum and copper alloys, which are also subject to corrosion [ 2 ]. Marine corrosion is a permanent problem, not only for moving or stationary ships, but also for all port installations, desalination installations, and objects that come into prolonged contact with water and the marine atmosphere [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”