ISSN 2305-6894

2014, Vol. 3, Issue 3 (pp. 149–214)

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Inhibitive properties of some chelates and their ligands in acid corrosion of zinc

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1 Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russian Federation
2 Research Institute of Physical and Organic Chemistry at Southern Federal University, pr. Stachki 94/3, Rostov-on-Don, 344104 Russian Federation

Abstract: A comparative study of the protective properties of zinc chelate complexes with various ohydroxyazomethine derivatives having substituents of various nature at the ligand benzene ring has been carried out for zinc acid corrosion in H2SO4 solutions.

Int. J. Corros. Scale Inhib., , 3, 204–214 PDF (767 K)
doi: 10.17675/2305-6894-2014-3-3-204-214

Chromate-free passivation of aluminum alloys for paint repair technologies

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1 A.N.Severtsev Institute of ecology and evolution problems, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russian Federation
2 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: A comparative evaluation of the protective properties of chromate-free passivating formulations offered as an alternative to the widely used method for passivation of aluminum surfaces by Cr(VI) compounds has been carried out. It has been shown that the protective properties of the compounds tested in the system with the EP-0215 primer are nearly not inferior to the formulations based on hexa- and trivalent chromium.

Int. J. Corros. Scale Inhib., , 3, 198–203 PDF (418 K)
doi: 10.17675/2305-6894-2014-3-3-198-203

Specific features of steel corrosion propagation and inhibition during abrasive dilatant treatment

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1 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation
2 NPO ROCOR Ltd, ul. Obrucheva 40/4, Moscow, 117342 Russian Federation

Abstract: The rate of corrosion damage development on steel after hydroabrasive and abrasive dilatant cleaning treatment, as well as the effect of some inhibitors on the rate of corrosion development on specimens cleaned by different methods have been studied. It has been shown that abrasive-dilatant treatment combined with inhibition efficiently hinders corrosion on freshly-cleaned surfaces and can slow down the formation and growth of corrosion sites by an order of magnitude.

Int. J. Corros. Scale Inhib., , 3, 190–197 PDF (513 K)
doi: 10.17675/2305-6894-2014-3-3-190-197

Impact of iron oxide (rust) on the performance of calcium phosphate scale inhibitors for industrial water systems

  • Z. Amjad
Division of Mathematics and Sciences, 2020 E. Maple Street, North Canton, OH 44270, USA

Abstract: The inhibition of calcium phosphate precipitation by homo- and copolymers containing different functional groups has been examined in aqueous solution. It has been found that polymer performance as calcium phosphate inhibitor depends upon polymer architecture. The influence of iron oxide (Fe2O3, rust) on the performance of calcium phosphate inhibitors has also been investigated. Results show that addition of small amount (10 mg to 100 mg) of Fe2O3 to the calcium phosphate supersaturated solution exhibits marked antagonistic effect on inhibitor performance. Various mechanism(s) have been proposed to explain the negative impact of Fe2O3 on inhibitor performance.

Int. J. Corros. Scale Inhib., , 3, 177–189 PDF (642 K)
doi: 10.17675/2305-6894-2014-3-3-177-189

N-Substituted amino acids as multifunctional additives used in cooling water. I. N-Hydroxymethyl amino acids

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1 Department of Interfaces and Surface Modification, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, 1117 Budapest, Hungary
2 Óbuda University, Faculty of Light Industry and Environmental Engineering, Doberdó u. 6., 1034 Budapest, Hungary
3 Central Environmental and Food Science Research Institute, Herman Ottó út 15., 1022 Budapest, Hungary

Abstract: The aim of our research was to synthesize and apply chemicals that can control both the electrochemical and microbiological corrosion. In order to achieve this result Nhydroxymethylated amino acids were synthesized and used as corrosion inhibitors and as biocides. With weight loss tests and linear polarisation experiments were proven their efficiency as corrosion inhibitors. The biocide activity was measured in microbiological experiments. It was important to learn whether these molecules can control the growth both of the planktonic as well as of the biofilm-embedded microbes, too. With different calculations correlation was found between the molecular structure and their efficiency.

Int. J. Corros. Scale Inhib., , 3, 167–176 PDF (977 K)
doi: 10.17675/2305-6894-2014-3-3-167-176

Hydrocarbon-soluble metal corrosion inhibitors. II. Physicochemical aspects of inhibitor action. Amides and salts of carboxylic acids

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OOO NPO NEPhTEKhIM, ul. Pulkovskaya 10, St. Petersburg, 196158 Russian Federation

Abstract: Some molecular aspects of protective action and specific behavior of hydrocarbon-soluble amides and salts of certain amines and morpholine with carboxylic acids in aqueousorganic environments are considered. The electron densities on those heteroatoms which are presumably responsible for adsorption and inhibition, as well as the Hansch π-constants have been calculated. Hypothetical adsorption models have been suggested for tridecanoic acid amides with hexylamine, cyclohexylamine, piperidine, piperazine, morpholine and the cyclohexylamine quaternary salt. Hypothetical adsorption schemes and the probable inhibitor efficiency of the products have been analyzed with consideration for data on the electronic charges and hydrophobicity of the molecules.

Int. J. Corros. Scale Inhib., , 3, 160–166 PDF (862 K)
doi: 10.17675/2305-6894-2014-3-3-160-166

Phosphonic acid derivatives used in self assembled layers against metal corrosion

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1 PhD School of Materials Sciences and Technologies;Óbuda University / Bécsi út 96/B, 1016 Budapest, Hungary
2 Libyan Petroleum Institute, Girgarisg Road Km7, Tripoli, Libya
3 Institute of Media Technology and Light Industry; Óbuda University/ Doberdó út 6., 1034 Budapest, Hungary
4 Department of Functional and Structural Materials, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Magyar tudósok körútja 2, Hungary

Abstract: The preparation of self assembled molecular (SAM) layers needs molecules with a small hydrophilic and a big hydrophobic molecular parts. Special molecules were chosen where the head group was in all cases phosphonic group, but there were significant differences in the other molecular part. In one case a medium sized carbon chain with a single double bound, in the second case a long alkyl chain with fluoro atoms, and in the third case a polymer molecular part represented the hydrophobic molecular section. Our work was focused on the preparation and characterization of their SAM layers they formed on solid surfaces under the different conditions. The molecular films were deposited from organic solvents on different metal surfaces covered by oxide layer. In the case of the layer with double bounds, polymerization of the molecules on the surface with UV light was applied. The modified surfaces were characterized by the wettability and their anti-corrosion activity was determined in linear polarization experiments. According to the numerical results the wettability of the surfaces differed significantly, i.e., we successfully modify the solid surface with the coatings. The anticorrosion activity of the coated surfaces depends on the molecules used for layer deposition. The samples with fluoro-alkyl chains gave the best results, not only their contact angles were very high but their anti-corrosion effectiveness was the best.

Int. J. Corros. Scale Inhib., , 3, 151–159 PDF (762 K)
doi: 10.17675/2305-6894-2014-3-3-151-159

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