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Abstract Corrosion weight loss test, corrosion potential-time curve, polarization curve, scratched electrode technique and colour test with K_3Fe(CN)_6 and NaCl solution etc. have been used to investigate the inhibition effect of borax on carbon steel in deionized water, FeCl_3 and KClO_3 solutions with different conditions of aeration. The chemical composition of the inhibitory film has been analysed by XPS. It is found that the inhibition of borax is independent on the existence of dissolved oxygen in the solutions. As the concentration of dissolved oxygen increase, the inhibition efficiency, the resistance to pitting perforation of Cl~- and the ability to repair the inhibitory films decrease. The inhibitory films formed by borax on the surface of carbon steel in FeCl_3 solution with dissolved oxygen mainly consists of Fe_2O_3, FeO and ferric borate, with occluded Cl~- ions. In this case, the borax acts as an anodic inhibitor. Under fully deaerated condition, however, the inhibitory film consists of FeO, Fe_2O_3 and adsorbed B_4O_7~(2-) ions, and the borax acts as a mixing inhibitor.
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Received: 25 August 1992
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