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The objective of this work was to study the electrochemical behavior and the formation of API X 65 carbon steel corrosion products when exposed to sweet and sour corrosion at the same time, knowing the competitive behavior of the FeS and FeCO3 formation. Due to the extreme toxicity and difficulty of working with the H2S, the use of Sodium Thiosulphate if shows an excellent alternative for H2S generation in metal/solution interface. EIS tests and mass Loss, were carried out in an autoclave with partial pressure of 5 bar of CO2, 25, 90 and 120° C with and without the presence of H2S. The products formed were characterized by SEM and DRX. In conditions without H2S, 25° C no film formed on the samples, the 90° C a porous FeCO3 film formed on the material but the results he indicated a low protective capacity. Already 120° C the layer of FeCO3 graduated more stable and dense, reducing the corrosive processes. The addition of the thiosulfate ion proved efficient to simulate H2S effects, since accession of sour corrosion products were identified. FeS films formed reduced the corrosive effects of CO2 and hampered the FeCO3 precipitation in the material. The film competition was more intense at 120° C, where the FeCO3 and FeS found stable formation conditions.

DEGRADAÇÃO E FORMAÇÃO DE PRODUTOS DE CORROSÃO NO AÇO API X65 EXPOSTO AOS MECANISMOS DE SWEET E SOUR CORROSION