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 SM ISO690:2012PARŞUTIN, Vladimir, SHOLTOYAN, Nicolai, SIDEL’NIKOVA, Svetlana, VOLODINA, Galina, BOLOGA, Olga, GERBELEU, Nicolae. The influence of functional ligands groups in coordination compounds on inhibition of steels corrosion in water. In: Physical Methods in Coordination and Supramolecular Chemistry, 27 septembrie - 1 octombrie 2006, Chişinău. Chisinau, Republic of Moldova: 2006, XVII, p. 163. ISBN 978-9975-62-066-6. |
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| Physical Methods in Coordination and Supramolecular Chemistry XVII, 2006 |
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Conferința "The XV-th International Conference Physical Methods in Coordination and Supramolecular Chemistry : The XVII-th Reading in memory of Acad. A.Ablov" Chişinău, Moldova, 27 septembrie - 1 octombrie 2006 | ||||||
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The inhibiting effect on corrosion mild steels in natural waters of Moldova and modelling media of some coordination compounds on the basis of the hydrazine (hydrazine-1,1-diacetic acid (I), thiosemicarbazide (II), thiosemicarbazide of diacetic acid (III), thiocarbohydrazide (IV), containing various functional groups: NH2-, -NH-, , , СH2-, СООН- has been determined. The mechanism of inhibition of steels is offered, including the inhibitor adsorption on active sites to corroding surface of metal therefore the stationary potential of metal is shifted in the positive part. There are decomposition inhibitors II, III and IV to the formation of various products, in particular, of thiourea, in turn decaying in the alkaline media with allocation of H2S, NH3 and CO2. Simultaneously thiourea with participation of oxygen of air is exposed to hydrolysis and oxidation with formation of urea and other products. There is the oxidation of Fe2+ up to Fe3+, formation on corrosion surfaces of a film of oxides and iron hydroxide and interaction of iron ions with ligand fragments with formation of insoluble complexes and inclusion of the last in integumentary layers. Simultaneously at interaction of iron ions with H2S marcasite FeS2, is formed also included in an integument film that strengthens its protective action and increases adsorption of inhibitor on corrosive surfaces of steel. It is shown, that introduction in water of II and IV reduces rate of corrosion up to 6 times, providing a degree of protection more than 82%. Thus on a surface began in 48-72 hours the protective film consisting from cubic oxide λ - Fe2O3, lepidocrocite λ - FeOOH and acagenite β-Fe2O3⋅.H2O is formed. Protective action amplifies adsorption of inhibitor and products of its decomposition, and also formation on corroding surface fine deposits. In their structure also calcium as calcite СаСО3 and marcasite FeS2 are included, formed as a result of interaction of products of decomposition of inhibitor with ions of iron. Calcite and marcasite fill the pores of hydroxide-oxide film, raising its protective action. |
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