Corrosion of cannon 75/27, model 1911. déport, from the collection of the Military Museum in Belgrade

Abstract

This paper analyzes the state of the French Cannon 75/27 model 1911. Déport made of steel. The amount of non-corroded materials, the presence of cracks and other defects in the cannon were determined by the radiographic method. The composition of corrosion products were analyzed using diffraction of X-rays (XRD method). In addition to goethite α-FeO(OH), lepidocrocite γ-FeO(OH) and magnetite Fe3O4, the presence of akaganeite was observed in the corrosion products, β-Fe8O8(OH)8Cl1.35 which indicates the accelerated corrosion of the base metal. With the ion chromatography method, the content of chloride, sulphate and other ions in corrosion products were examined. On the basis of conducted experiments, it can be concluded that it is necessary to treat the cannon in appropriate solutions, as quickly as possible, to remove chloride and sulphate ions.

U ovom radu analizirano je stanje francuskog topa 75/27 model 1911 Déport izrađenog od čelika. Za određivanje količine nekorodiralog materijala, prisustva prslina i drugih defekata u eksponatu korišćena je radiografska metoda. Sastav korozionih produkata je analiziran metodom difrakcije rendgenskih zraka (XRD). Pored getita, α-FeO(OH), lepidokrokita, γ-FeO(OH) i magnetita, Fe3O4, na eksponatima je uočeno prisustvo akaganita koje ukazuje na aktivnu koroziju osnovnog metala. Metodom jonske hromatografije je određen sadržaj hloridnih i drugih anjona u korozionim produktima. Na osnovu izvedenih eksperimenata nameće se zaključak o neophodnosti tretmana topa u odgovarajućim rastvorima što je moguće pre u cilju uklanjanja hloridnih i drugih koroziono aktivnih jona.