The use of inorganic conversion coatings to enhance the corrosion resistance of reinforcement and the bond strength at the rebar/concrete

Static and dynamic behavior of concrete slabs reinforced with chemically reactive enamel-coated steel bars and fibers

“…Inorganic coatings, such as phosphate and CRE coatings, can significantly improve the adhesion and friction between steel bar and concrete. Jalili et al (2009) indicated that the bond strength between the Zn-Ca phosphate-coated rebar and concrete is 74% greater than that between uncoated rebar and concrete. CRE coating can also significantly increase the bond strength of rebar in concrete matrix (Day et al, 2006;Wu et al, 2012;Yan et al, 2012).…”

Modified Zinc Phosphate Coatings: A Promising Approach to Enhance the Anti-Corrosion Properties of Reinforcing Steel

“…Jalili [12] showed that adding Ca 2+ to the phosphate bath led to a significant reduction in corrosion current to a value of about one-fifth to one-eighth when compared to that recorded by the control. This addition also enhanced the bond strength between the rebar and the concrete by about 74%.…”

“…As a result, the corrosion resistance of the conventional phosphate coating is not high enough. Additives such as Ni , Cu 2+ and Mn 2+ and nanoparticles have been extensively used to produce phosphate coatings with uniform structure, lower porosity and improved corrosion resistance and adhesion properties [22,13,12,23,11,17,24] Being a newly adapted method in the field of reinforcement corrosion protection [25][26][27]13]this paper tries to review some important aspects related to the improvement of corrosion resistance of reinforcement using zinc phosphate coatings modified by metal cations or nanoparticles.…”

“…In the literature, there are state of the art review studies on numerous methods of protection against reinforcement corrosion [3][4][5][6][7][8]. Applying zinc phosphate coating on reinforcing steel will probably be a vital approach in the future [9][10][11][12][13][14]. The phospahting process has been known for over a century [15].…”

Blast response of full-size concrete walls with chemically reactive enamel (CRE)-coated steel reinforcement

“…To reduce the potential for corrosion in steel bar, materials such as calcium silicate compounds (Moon et al, 2007), elastomers (Seneviratne et al, 2000), quaternary thioarsenates (Yan et al, 2016a;2016b), and geopolymers (Zhang et al, 2010) have been recently proposed for potential application to the surface of concrete structures for improved corrosion resistance in harsh environments. A few rebar coatings, which are regarded as a more cost-effective way to prevent the corrosion of rebar, have been developed, such as epoxy (Kobayashi and Takewaka, 1984), resin (Selvaraj et al, 2009), galvanizing metal (Kayali and Yeomans, 2000), and phosphate conversion (Jalili et al, 2009). However, when the bond strength between rebar and concrete is taken into consideration, it is found that the use of epoxy-coated rebar could reduce the bond strength by at least 20% (Kobayashi and Takewaka, 1984); the use of galvanized steel has little influence on the bond strength (Kayali and Yeomans, 2000), and the use of Zn-Ca phosphate coating could improve the bond strength by up to 74% (Jalili et al, 2009).…”