Recently, slow-release materials have attracted more attentions. In this work, a kind of the slow-release inhibitor was successfully synthesised to protect carbon steel from corrosion and the effect of temperature on the passivation behaviour was evaluated. The results indicated that boron was the main dissolution-release component, and the dissolution-release rate increased with the increasing temperature. Meanwhile, the evaporation volume significantly decreased after adding the inhibitor. Good passivation performances over 33-day and near 15-day were obtained at 30-40°C (95.56-98.02%) and 50-60°C (95.06-97.09%), respectively, which was confirmed by a series of electrochemical tests. A passive film with Fe–O–B structure and the buffering characteristic of borate solution together contributed to the good passivation performance. This work revealed the effect of temperature on the passivation behaviour of the slow-release inhibitor and provided a theory foundation of the application of the slow-release inhibitor in the practical condition.
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