Comparative study of the efficiencies of inhibitive agents corrosion commercials in concrete maritime structures armed

Abstract

Reinforced concrete structures exposed to the marine environment are subject to the development of different types of corrosion that cause deterioration of the material, decrease in mechanical properties, costs and operational safety failures. Among the different mechanisms for protecting structures from corrosion, corrosion inhibitors stand out. Through the integrative review method, the following research made a comparison between the protection efficiencies of different corrosion inhibitors that are frequently commercialized, comparing the resistance to compression and corrosion potential in different specimens, which were allocated to the marine environment: immersed in sea water, marine atmosphere and conditions that simulate this environment, such as NaCl solutions in different concentrations. As a result of the research, the following corrosion inhibitors, calcium nitrite, sodium tungstate and sodium molybdate, were shown to have the greatest protection efficiency. When comparing the compressive strength of the different specimens, those to which calcium nitrite or sodium tungstate contained as an inhibitor, achieved satisfactory efficiencies. As for the comparison of different corrosion potentials, the specimens that used sodium molybdate and calcium nitrite as inhibitors, showed fewer regions with active corrosion in the structures. The need to adapt the concentration of the corrosion inhibitor to the steel structure and the water / cement ratio for concrete production is evident, the different functionalities of the structures must also be taken into account, as there are operations that catalyze the corrosion process.