Electrochemical Performance of Sodium Dichromate Partial Replacement Models by Triethanolamine Admixtures on Steel-Rebar Corrosion in Concretes

摘要

This paper studies electrochemical performance of partial replacement models of sodium dichromate(Na2Cr2O7) inhibitor by triethanolamine (C6H15NO3) admixtures on the corrosion of steel-rebarembedded in concrete immersed in corrosive environments. For these, 3.5% NaCl and 0.5M H2SO4media were employed for respectively simulating saline/marine and industrial/microbial corrosive test- environments. Test-results of electrochemical monitoring techniques were subjected to statisticalmodelling of probability distribution fittings, goodness-of-fit tests and analyses for detailing admixtureperformance in steel-reinforced concretes. Results from these identified 6 g Na2Cr2O7 + 2 g C6H15NO3and the 2 g Na2Cr2O7 + 6 g C6H15NO3 partial Na2Cr2O7 replacement admixtures with excellentinhibition efficiencies, = 91.7% and = 90.0%, respectively in the NaCl-immersed concretes. Also,the 2 g Na2Cr2O7 + 6 g C6H15NO3 exhibited inhibition efficiency = 52.5% that lagged behind =72.0% of 8 g Na2Cr2O7 but which both represent good efficiency criteria in the H2SO4-immersedconcretes.