Effect of calcium hydroxyzincate on bond strength of hot-dip galvanized plain bars with normal strength concrete

Pokorný, Petr; Kostelecká, Michaela; Prodanovic, Nikola; Sýkora, Milan

doi:10.1016/j.cemconcomp.2022.104540

Cited by 15 publications

(26 citation statements)

References 49 publications

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“…In this time interval, the thickness of the layer of corrosion products increases swiftly. Time dependence of intensification of growth corresponds to previously published results [ 14 , 41 , 81 , 82 , 83 , 84 ]. Simultaneously, the R ref (ct) increases, suggesting reduction of corrosion rate due to formation of corrosion products layer with barrier effect.…”

Section: Resultssupporting

confidence: 87%

“…The surface is covered by crude fraction and also fine platelets (precipitated both in vertical positions and parallely to HDG surface) which are most likely composed of CHZ. These were observed and described in detail by numerous authors [ 2 , 9 , 14 , 81 , 82 , 109 , 110 , 111 , 112 ]. The ratio of surface coverage by platelets is high; no pores or unoccupied areas were apparent.…”

Section: Resultsmentioning

confidence: 69%

“…From the long-term point of view (R p past 120 h), it is apparent that forming corrosion products (probably Mn-rich phases in different oxidation state), HDG gives the samples lower protective barrier properties (reduction of 20%) compared the common corrosion products (see R p after 120 h for reference samples). From this point of view it can be argued that presence of common HDG corrosion products up until pH 13.3 (CHZ, ZnO/Zn(OH) 2 ) [ 9 , 14 , 76 , 81 , 82 , 84 ] provides the coating with higher barrier properties compared to exposure in environments with MnO 4 − sufficient to considerably reduce RDHE.…”

Section: Resultsmentioning

confidence: 99%

“…The reference sample clearly showed the presence of HDG corrosion products typical for exposure in simulated concrete pore solution up to pH = 13.3, i.e., Ca[Zn(OH) 3 ] 2 ·2H 2 O (CHZ) and ZnO [ 2 , 9 , 14 , 81 , 82 , 113 , 114 , 115 , 116 ]. The presence of CaCO 3 in corrosion products was discussed in the previous sections.…”

Section: Resultsmentioning

confidence: 99%

“…Anodic corrosion reaction reduces the coating thickness, and cathodic reaction (hydrogen evolution) increases the porosity of the cement paste at phase interface. This increase in porosity can reduce the bond strength between coated rebar and concrete [ 9 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Graded Amount of Potassium Permanganate on Corrosion of Hot-Dip Galvanized Steel in Simulated Concrete Pore Solutions

et al. 2022

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This paper evaluates the amount of KMnO4 in simulated concrete pore solution (pH 12.8) on the corrosion behaviour of hot-dip galvanized steel (HDG). In the range of used MnO4− (10−4, 10−3, 10−2 mol·L−1), corrosion behaviour is examined with regard to hydrogen evolution and composition (protective barrier properties) of forming corrosion products. The corrosion behaviour of HDG samples is evaluated using Rp/Ecorr and EIS. The composition of corrosion products is evaluated using SEM, XRD, XPS and AAS. The effective MnO4− ion concentration to prevent the corrosion of coating with hydrogen evolution is 10−3 mol·L−1; lower concentrations only prolong the time to passivation (corrosion with hydrogen evolution). The highest used MnO4− concentration ensures corrosion behaviour without hydrogen evolution but also leads to the formation of less-protective amorphous corrosion products rich in MnII/MnIII phases.

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