ISSN 2305-6894

2016, Vol. 5, Issue 1 (pp. 1-99)

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The science of corrosion inhibitors suffered a severe loss

A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The science of corrosion inhibitors suffered a severe loss: Professor Giordano Trabanelli passed away. He was not only an outstanding scientist, but also a permanent inspirer and organizer of Ferrara Congresses that for half a century have been the European and worldwide center of scientific thought in this area of anticorrosion protection. These Congresses were conducted at an utmost scientific and organizational level and, at the same time, were amazingly friendly. All their participants felt welcome guests of Prof. Trabanelli and his team. The Editorial Board of our journal, on behalf of all its contributors and readers, would like to express their sincere condolences to our Italian friends and to the family of Prof. Trabanelli. The cherished memory about Professor Trabanelli, a remarkable person and scientist, will help us continue the consolidation of inhibitory protection experts that he initiated.

Int. J. Corros. Scale Inhib., , 1, PDF (7 K)

Protection of stainless steel in hydrochloric acid solution containing hydrogen sulfide by inhibitors

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1 K. E. Tsiolkovsky Kaluga state university, 248023 Kaluga, Russian Federation
2 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: Corrosion of chromium-nickel steel 1Kh18N9T in 2 M HCl at t = 20–100°C was studied using the mass loss method. In parallel, hydrogen absorption by steel in the corrosive medium was measured by vacuum extraction method. IFKhAN-92 (a 1,2,4-triazole derivative) and its combination with urotropine were studied as corrosion inhibitors for stainless steel. It was shown that chromium-nickel steel 1Kh18N9T has low corrosion resistance in HCl solutions, particularly at temperatures close to 100°C. Under the conditions studied, the metal corrosion rate is k = 0.42–275 g/(m2·h) and increases with an increase in t. However, resistance of stainless steel to hydrogen absorption was noted. Addition of 15 mM H2S to the HCl solution considerably accelerates the corrosion of chromium-nickel steel (k = 3.2–800 g/(m2·h)) and causes strong hydrogen absorption. The highest content of hydrogen absorbed in the metal (24 ml/100 g) was observed at t = 40°C and 2 h exposure of the specimens. Longer exposures of steel specimens in the corrosive medium increase hydrogen absorption by the metal. Addition of IFKhAN-92 or a formulation of IFKhAN-92 with urotropine (at 1: 4 molar ratio of the components) provides efficient inhibition of steel corrosion in hot HCl solutions (t = 80–100°C). Corrosion is hindered 16–162 fold by IFKhAN-92 alone or 20–183 fold by its formulation with urotropine. We recommended the formulation of IFKhAN-92 with urotropine for protection of chromium-nickel steel in HCl solutions containing H2S. It efficiently hinders the metal corrosion (18–250 fold) up to 100°C and totally prevents hydrogen absorption up to 60°C, inclusively.

Int. J. Corros. Scale Inhib., , 1, 87–99 PDF (916 K)
doi: 10.17675/2305-6894-2016-5-1-7

Creation and study of formulations as inhibitors of metal corrosion and scaling for stabilization water treatment in water utilization systems (a review)

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1 The Federal State Unitary Enterprise “The State Scientific Research Institute of Chemical Reagents and High Purity Chemical Substances” (FSUE “IREA”), Bogorodskiy Val Street, 3, 107076 Moscow, Russian Federation
2 Ural State Forest Engineering University (USFEU), Sibirsky Trakt, 37, 620032 Yekaterinburg, Russian Federation

Abstract: This review summarizes studies for the past 5 years aimed at creation of efficient organophosphonate reagents for the stabilization water treatment aimed at preventing metal corrosion and scaling in water utilization systems.

Int. J. Corros. Scale Inhib., , 1, 66–86 PDF (1 105 K)
doi: 10.17675/2305-6894-2016-5-1-6

Preservative materials based on vegetable oils for steel protection against atmospheric corrosion. I. Colza oil

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1 All-Russian Scientific Research Institute of Use of Machinery and Oil Products, Novo-Rubezhnyi per., 28, Tambov, 392022, Russian Federation
2 Derzhavin State University, ul. Internatsyonalnaya, 33, Tambov, 392000, Russian Federation
3 Tambov State Technical University, ul. Sovetskaya, 106, Tambov, 392000, Russian Federation

Abstract: The protective efficiency of a formulation based on low erucic colza oil against carbon steel corrosion in salt solution (0.5 M NaCl), in a thermal moisture chamber and under natural conditions has been studied. The following formulations have been used: (1) colza oil (CO) without inhibiting additives; (2) CO with addition (1–10 wt.%) of synthetic fat acids bottoms (SFAB); and (3) CO with the IFHAN-29A anticorrosion additive (20 wt.%). Corrosion tests and electrochemical measurements have been conducted. Protective CO coatings are not efficient in the presence of chloride ions but provide a high protective efficiency under natural conditions.

Int. J. Corros. Scale Inhib., , 1, 59–65 PDF (581 K)
doi: 10.17675/2305-6894-2016-5-1-5

Hydrocarbon-soluble inhibitors of metal corrosion. Part 3. Dependence of the inhibitive efficiency and adsorptivity of oleic acid amides and salts on their physicochemical parameters

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

Abstract: Correlation analysis of the dependence of the inhibitive efficiency (determined from electrochemical measurement data) and adsorption capability (determined from the changes in the junction potential difference upon formation of an adsorption film on a metal from inhibitor solutions) on the physicochemical parameters has been performed for a number of amides and salts obtained from the same amines and differing in the number and arrangement of nitrogen atoms in the molecules. A prediction is given for the efficiency of a mono-substituted piperazine amide – a corrosion inhibitor for carbon steel and copper.

Int. J. Corros. Scale Inhib., , 1, 50–58 PDF (815 K)
doi: 10.17675/2305-6894-2016-5-1-4

Inhibition of magnesium corrosion by triazoles

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A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The inhibitive action of some azoles (1,2,4-triazole, 1,2,3-benzotriazole, 5-chlorobenzotriazole, and IFKhAN-92 corrosion inhibitor) on the corrosion of magnesium was investigated in aqueous buffer solutions and humid atmosphere. Increasing the hydrophobicity and decreasing the pKa of NH-acids enhance the protection of Mg by triazoles, that is why 5-chlorobenzotriazole and IFKhAN-92 – a mixture of substituted triazoles – are more efficient inhibitors. Small additions of dioctylphosphate increase the protection of Mg in aqueous solution by IFKhAN-92 inhibitor, and addition of trialkoxysilane to the mixed inhibitor allows one to enhance the protection of Mg in a humid atmosphere.

Int. J. Corros. Scale Inhib., , 1, 31–49 PDF (806 K)
doi: 10.17675/2305-6894-2016-5-1-3

CaCO3 scale prevention by additives in the presence of heavy metal ions

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Saudi Aramco, Research and Development Center, Dhahran, 31311, Saudi Arabia

Abstract: Formation of calcium carbonate (CaCO3) deposition is a common problem during hydrocarbon production process. Effective scale management is important to maintain field productivity and profitability. Use of threshold scale inhibitor has been the most cost effective approach to control CaCO3 deposition. The performance of scale inhibitors is determined by many factors such as calcium and bicarbonate concentrations, pH, temperature, suspended solids. This article presents the influences of three heavy metal ions, Cu2+, Ni2+, and Zn2+, on the performance of phosphonate and polymeric inhibitors against CaCO3 precipitation and deposition in synthetic oilfield brine. It is shown that even at 2 to 5 mg/L, heavy metal ions can have a significant impact on phosphonate inhibitors. The inhibition efficiency of tri-phosphonate is improved by Cu2+ ions but reduced by Zn2+ ions, and the performance of penta-phosphonate is enhanced by Cu2+ and Zn2+ ions and deteriorated by Ni2+ ions. Polymeric inhibitor is less affected by these heavy metal ions and no antagonistic effect is observed. The results presented herein are important in the development of cost-effective CaCO3 prevention programs and development of new mitigation methods.

Int. J. Corros. Scale Inhib., , 1, 12–30 PDF (1 532 K)
doi: 10.17675/2305-6894-2016-5-1-2

Maleic acid-based copolymers as silica scale control agents for aqueous systems

  • Z. Amjad
School of Arts and Sciences, Walsh University, N. Canton, Ohio, 44720, USA

Abstract: The inhibition of silica polymerization by homo- and copolymers containing different functional groups has been studied in aqueous solution. It has been found that silica polymerization reaction is preceded by an induction period that is dependent on silica supersaturation. The investigation in the presence of additives indicates that silica polymerization strongly depends on the additive composition, ionic charge, and molecular weight. This study also presents comparative performance data on bio- and synthetic polymers.

Int. J. Corros. Scale Inhib., , 1, 1–11 PDF (791 K)
doi: 10.17675/2305-6894-2016-5-1-1

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