N-heterocyclic Organic Inhibitors On The Corrosion Properties And Mechanism Of Bronze Impact

Bronze relics with high historical, artistic and scientific value are one of the symbolizations of ancient civilization of human being. Due to their long buried time, changes of the storage condition after excavation etc., it is a great challenge for us to take measures to prevent the ancient bronze relics from corrosion. Bronze in the wet, containing chloride ions and oxidizing atmosphere environment, prone to a great danger of being referred to as"bronze disease"of the corrosion process, so that bronze objects were seriously damage.The use of inhibitors is one of the most practical methods for protection against corrosion. Numerous researches on corrosion inhibition using organic compounds have been reported due to its highly efficient and cost-effective. It has been accepted that most organic compounds employed as corrosion inhibitors can adsorb on the metal surface through heteroatoms such as nitrogen,sulfur,oxygen,phosphorus and multiple bonds etc preventing steel from corrosion. Based on the conclusions, azole compounds are a number of bronze used as a corrosion inhibitor, to play its role in anti-corrosion. However, the corrosion inhibiting mechanism of the N-heterocyclic organic compounds compounds is not so clear. The aim of this work is to obtain a better understanding of the inhibiting behaviour of the N-heterocyclic organic compounds compounds derivatives and predict corrosion efficiency of similar structures in order to design compounds for testing their corrosion inhibition.N-heterocyclic organic inhibitors involved in this paper and the inhibiting performance of these derivatives was evaluated by weight loss, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transformed infrared (FTIR) testing. The corrosion inhibiting mechanism of these derivatives and the relationship between the bronze structure and their inhibiting efficiency were discussed. The following conclusions may be drawn:The weight loss experiments in the acid medium for 10 hours have demonstrated that the inhibition efficiency in hydrochloric acid medium is MBO> AMT> BTA. The inhibition efficiency of the AMT in the citric acid solution is 100%, higher than that of MBO and BTA because a protective film is formed on the surface of AMT treated bronze in the the citric acid solution. SEM observation showed that the film formed on the surface of the BTA treated rust bronze is loose while the surface of the AMT processed patina bronze samples has a dense protection film. The surface morphology of MBO processed bronze samples is much looser than that of BTA processed bronze samples.X-ray diffraction and FTIR results confirmed that after BTA and MBO treatment, the reaction products on the surface of bronze is Cu(I)-BTA and Cu(I)-MBO, respectively, while after the AMT treatment, there is a product of Bellamya reaction Cu (â…¡)-AMT and Cu (I)-AMT on the surface of bronze.