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

Pokorný, Petr; Vacek, Vítězslav; Prodanovic, Nikola; Zabloudil, Adam; Fojt, Jaroslav; Johánek, Viktor

doi:10.3390/ma15217864

Cited by 5 publications

(15 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, from a statistical point of view (see Figure 10), it is clear that only the addition of MnO 4 − anions at a concentration of 10 −3 mol•L −1 ensures already unambiguously higher values of ultimate bond strength (found at lower slip values) than that in the case of the reference exposure. The findings correlate well with the recently published results on the complete blocking of RDHE in hot-dip galvanized steel due to the presence of KMnO 4 at a concentration of 10 −3 mol•L −1 in simulated concrete pore solutions [37,52]. The observed higher ultimate bond strength values (read for lower slip values) for the Mn (2) substitution compared to the reference exposure are related not only to the suppression of RDHE but also to the formation of less dense and, at the same time, less crystalline corrosion products (corrosion products rich in phases with Mn II /Mn III [52]).…”

Section: Modified Bond Strength Testsupporting

confidence: 91%

“…The findings correlate well with the recently published results on the complete blocking of RDHE in hot-dip galvanized steel due to the presence of KMnO 4 at a concentration of 10 −3 mol•L −1 in simulated concrete pore solutions [37,52]. The observed higher ultimate bond strength values (read for lower slip values) for the Mn (2) substitution compared to the reference exposure are related not only to the suppression of RDHE but also to the formation of less dense and, at the same time, less crystalline corrosion products (corrosion products rich in phases with Mn II /Mn III [52]). However, based on the tests performed, it is not possible to decide which of these factors (complete suppression of RDHE, completely different composition of corrosion products compared to the reference exposure) has a more significant effect on the bond strength of hot-dip galvanized steel with concrete.…”

Section: Modified Bond Strength Testsupporting

confidence: 91%

“…It is very likely that on the surface of the hot-dip galvanized steel, there is a reduction (cathodic corrosion process) of Mn VII to oxo-compounds containing manganese in a lower oxidation state from the beginning of the exposure. Based on results reported recently [37,52], it is clear that the reduction takes place in the Mn II /Mn III oxidation state. Within the sequence of possible reduction reactions, Equations ( 9)-( 13) can be given [52,[59][60][61][62][63][64], and it can be expected that the first step involves the reduction in MnO 4…”

Section: E Corr Measuringmentioning

confidence: 72%

“…Based on results reported recently [37,52], it is clear that the reduction takes place in the Mn II /Mn III oxidation state. Within the sequence of possible reduction reactions, Equations ( 9)-( 13) can be given [52,[59][60][61][62][63][64], and it can be expected that the first step involves the reduction in MnO 4…”

Section: E Corr Measuringmentioning

confidence: 72%

“…Lower ultimate bond strength values were measured for this mixture than for the reference exposure. Since it is evident that also the addition of 10 −2 mol•L −1 MnO 4 − anions to the simulated concrete pore solution at pH 12.8 completely suppresses RDHE, it is necessary to consider that a significant change in the composition of corrosion products in favor of manganese-rich amorphous phases (mainly Mn III [52]) significantly reduces the adhesion factor (f ad ). A reduction in the surface roughness (f f effect) of the hot-dip galvanized steel due to the ongoing reactions on its surface may also contribute to the decrease in adhesion (as in the case of Mn (2) substitution).…”

Section: Modified Bond Strength Testmentioning

confidence: 99%

See 4 more Smart Citations

The Effect of Addition Potassium Permanganate on Bond Strength of Hot-Dip Galvanized Plain Bars with Cement Paste

et al. 2023

Self Cite

View full text Add to dashboard Cite

In this paper, the effect of gradually increasing amounts of KMnO4 (10−4, 10−3, 10−2 mol·L−1) in cement paste on the bond strength of a plain hot-dip galvanized steel bar was evaluated. The open-circuit potential of HDG samples in cement paste with various additions of MnO4− was monitored in order to follow a transfer of zinc from activity to passivity. Furthermore, the influence of the addition of these anions on the physicochemical properties of normal-strength concrete or cement paste was evaluated by means of hydration heat measurements, X-ray diffraction analysis, and compressive strength. The effective concentration of MnO4− anions prevents the corrosion of the coating with hydrogen evolution and ensures that the bond strength is not reduced by their action, which was determined to be 10−3 mol·L−1. Lower additions of MnO4− anions (10−4 mol·L−1) are ineffective in this respect. On the other hand, higher additions of MnO4− anions (10−2 mol·L−1), although they ensure the corrosion of the coating in fresh concrete without hydrogen evolution, but affect the hydration process of the cement paste that was demonstrated by slight water separation.

show abstract

Section: Modified Bond Strength Testsupporting

confidence: 91%

Section: Modified Bond Strength Testsupporting

confidence: 91%

Section: E Corr Measuringmentioning

confidence: 72%

Section: E Corr Measuringmentioning

confidence: 72%

Section: Modified Bond Strength Testmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Addition Potassium Permanganate on Bond Strength of Hot-Dip Galvanized Plain Bars with Cement Paste

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Characterization and Corrosion Behavior of Zinc Coatings for Two Anti-Corrosive Protections: A Detailed Study

Pop,

Iepure,

Titu

et al. 2023

Coatings

View full text Add to dashboard Cite

The purpose of this research is to characterize and evaluate the corrosion behavior of zinc coatings used for corrosion protection, with a special focus on the S235 steel material. The introduction highlights the need for corrosion protection in industrial settings, as well as the importance of understanding corrosion processes and the development of corrosion products to develop more effective solutions. The study’s goals are to undertake an extensive analysis of corrosion products formed on the zinc coating’s surface, to evaluate the performance of these coatings under atmospheric circumstances, and to investigate the effect of deposition parameters on coating quality. The essential message provided to readers is the critical significance of knowing corrosion product formation mechanisms and zinc coating corrosion behavior in developing long-lasting and effective protection measures. The study methodology includes cycle testing, morphological and chemical examination of corrosion products, as well as optical and electron microscopy and energy-dispersive spectroscopy. Corrosion resistance is assessed using accurate measurements. The results show that zinc coatings have exceptional corrosion resistance under air settings, with the produced corrosion products offering further protection to the underlying material. Furthermore, the study demonstrates that the surface roughness of S235 steel has a substantial impact on the quality and corrosion behavior of hot-dip galvanized coatings. The findings emphasize the necessity of detailed characterization of corrosion products, the effect of depositional factors on zinc coating performance, and the need for novel corrosion protection methods. These discoveries have significant implications for the corrosion protection sector, providing the potential to improve the longevity and efficiency of protective systems used in industrial applications.

show abstract

Corrosion Activity of Carbon Steel B450C and Stainless Steel SS430 Exposed to Extract Solution of a Supersulfated Cement

et al. 2022

View full text Add to dashboard Cite

Carbon steel B450C and low-chromium stainless steel SS430 were exposed for 30 days to supersulfated “SS1” cement extract solution, considered as a “green” alternative for partial replacement of the Portland cement clinker. The initial pH of 12.38 dropped since the first day to 7.84, accompanied by a displacement to more negative values of the free corrosion potential (OCP) of the carbon steel up to ≈−480.74 mV, giving the formation of γ-FeOOH, α-FeOOH and Fe2O3, as suggested by XRD and XPS analysis. In the meantime, the OCP of the SS430 tended towards more positive values (+182.50 mV), although at lower pH, and XPS analysis revealed the presence of Cr(OH)3 and FeO as corrosion products, as well the crystals of CaCO3, NaCl and KCl. On both surfaces, a localized corrosion attack was observed in the vicinity of local cathodes (Cu, Mn-carbides, Cr-nitrides, among others), influenced by the presence of Cl− ions in the “SS1” extract solution, originating from the pumice. Two equivalent circuits were proposed for the quantitative analysis of EIS Nyquist and Bode diagrams, whose data were correlated with the OCP values and pH change in time of the “SS1” extract solution. The thickness of the corrosion layer formed on the SS430 surface was ≈0.8 nm, while that on the B450C layer was ≈0.3 nm.

show abstract

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

Cited by 5 publications

References 106 publications

The Effect of Addition Potassium Permanganate on Bond Strength of Hot-Dip Galvanized Plain Bars with Cement Paste

The Effect of Addition Potassium Permanganate on Bond Strength of Hot-Dip Galvanized Plain Bars with Cement Paste

Characterization and Corrosion Behavior of Zinc Coatings for Two Anti-Corrosive Protections: A Detailed Study

Corrosion Activity of Carbon Steel B450C and Stainless Steel SS430 Exposed to Extract Solution of a Supersulfated Cement

Contact Info

Product

Resources

About