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51315-5590-Corrosion Test-data Modelling for C10H18N2Na2O10 Performance on Steel-rebar in 3.5% NaCl-immersed Concrete

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This paper studies empirical and correlation modelling of corrosion test-data for detailing C10H18N2Na2O10 (ethylenediaminetetraacetic disodium salt: EDTA-Na2) performance on concrete steel-rebar corrosion in 3.5% NaCl medium simulating saline/marine environment.

Product Number: 51315-5590-SG
ISBN: 5590 2015 CP
Author: Joshua Okeniyi
Publication Date: 2015
Industries: Buildings and Plant Equipment , Science of Corrosion
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This paper studies empirical and correlation modelling of corrosion test-data for detailing C10H18N2Na2O10 (ethylenediaminetetraacetic disodium salt: EDTA-Na2) performance on concrete steel-rebar corrosion in 3.5% NaCl medium simulating saline/marine environment. Three different non-destructive electrochemical monitoring techniques were employed for measuring corrosion test-data from duplicated samples of the NaCl-immersed steel-reinforced concrete slabs that were admixed with different C10H18N2Na2O10 concentrations. Empirical data from these were subjected to fittings of Weibull probability distribution function (pdf) and tested for compatibility with the distribution as prescribed by ASTM G16-95 R04 using Kolmogorov-Smirnov goodness-of-fit test-statistics. Analysed results revealed that corrosion rate from LPR technique correlated excellently (R2 = 90.85%; ANOVA p-value = 0.0174) with exponential function of C??H??N?Na?O?? molar-concentration and noise resistance obtained from the other two techniques. Analyses of the experimental data and of the correlation fitting predictions both identified in agreements the 0.0224M C??H??N?Na?O?? with optimal inhibition performance of concrete steel-rebar corrosion in the medium. Also the experimental and correlated prediction models both obeyed the Langmuir adsorption isotherm with excellent model efficiencies R2 = 99.94% (experimental) or R2 = 99.98% (predicted). Evaluated isotherm parameters from both models suggested favourable adsorption and predominant chemisorption mechanism byC??H??N?Na?O?? inhibitor of concrete steel-rebar corrosion in the saline/marine simulating environment. These bear implications of corrosion monitoring techniques that were technically simple to undertake exhibiting correlation with corrosion rate from LPR and thus finding suitability for indicating absolute corrosive activity of concrete steel-rebar in aggressive medium.

Key words: corrosion test-data modeling, electrochemical,monitoring techniques, concrete, steel rebar, saline, marine test environment, inhibition efficiency, adsorption isotherm, conference papers, 2015 conference papers

This paper studies empirical and correlation modelling of corrosion test-data for detailing C10H18N2Na2O10 (ethylenediaminetetraacetic disodium salt: EDTA-Na2) performance on concrete steel-rebar corrosion in 3.5% NaCl medium simulating saline/marine environment. Three different non-destructive electrochemical monitoring techniques were employed for measuring corrosion test-data from duplicated samples of the NaCl-immersed steel-reinforced concrete slabs that were admixed with different C10H18N2Na2O10 concentrations. Empirical data from these were subjected to fittings of Weibull probability distribution function (pdf) and tested for compatibility with the distribution as prescribed by ASTM G16-95 R04 using Kolmogorov-Smirnov goodness-of-fit test-statistics. Analysed results revealed that corrosion rate from LPR technique correlated excellently (R2 = 90.85%; ANOVA p-value = 0.0174) with exponential function of C??H??N?Na?O?? molar-concentration and noise resistance obtained from the other two techniques. Analyses of the experimental data and of the correlation fitting predictions both identified in agreements the 0.0224M C??H??N?Na?O?? with optimal inhibition performance of concrete steel-rebar corrosion in the medium. Also the experimental and correlated prediction models both obeyed the Langmuir adsorption isotherm with excellent model efficiencies R2 = 99.94% (experimental) or R2 = 99.98% (predicted). Evaluated isotherm parameters from both models suggested favourable adsorption and predominant chemisorption mechanism byC??H??N?Na?O?? inhibitor of concrete steel-rebar corrosion in the saline/marine simulating environment. These bear implications of corrosion monitoring techniques that were technically simple to undertake exhibiting correlation with corrosion rate from LPR and thus finding suitability for indicating absolute corrosive activity of concrete steel-rebar in aggressive medium.

Key words: corrosion test-data modeling, electrochemical,monitoring techniques, concrete, steel rebar, saline, marine test environment, inhibition efficiency, adsorption isotherm, conference papers, 2015 conference papers

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