Corrosion inhibitors designed to prevent general carbon dioxide corrosion in carbon steel wereinvestigated. The environment considered were two high salinity solutions, denominated as W1 andW2, which were kept at room temperature and had a pH of 4.8 and 5.6, respectively. The performanceof 2-mercaptopyrimidine and 4,6-diamine-2-mercaptopyrimidine was assessed using electrochemicaland weight loss tests. Mercaptopyrimidines were revealed to be mixed-type inhibitors thatpredominantly influenced the anodic process on the interface. The inhibition efficiency can bemonitored by corrosion potential measurements. It was concluded that 2-mercaptopyrimidinepresented better inhibition than 4,6-diamine-2-mercaptopyrimidine in the tested conditions.
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