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1

Evaluation of Some Inorganic Anions and Organic Compounds as Corrosion Inhibitors of Cu-Zn Alloys in H2SO4 and HNO3 Solutions

Ahmed Amal S. I., Ghanem Wafaa A., Hussein Walaa A., Gaber Ghalia A.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

639--651

EN

Evaluation of inorganic and organic compounds as corrosion inhibitors of Cu-Zn alloys in H2 SO4 and HNO3 solutions was studied using potentiodynamic and impedance spectroscopy along with scanning electron microscope (SEM) and energy dispersive X-Ray analyzer (EDX) investigations. The corrosion inhibition of Cu-Zn alloys was investigated in oxy acid solutions using inorganic potassium permanganate and di-hydrogen phosphate, amino acids as environmentally safe materials, commercial cooling water, and green tea extracts. Both potassium permanganate and di-hydrogen phosphate improve the corrosion resistance of Cu-Zn alloys. Phosphate appears more effective as corrosion inhibitor for Cu-Zn alloys than permanganate. The inhibition efficiency (IE%) of the different amino acids such as valine, leucine and lysine was also calculated. The experimental results have shown that amino acid-like lysine can be used as an efficient corrosion inhibitor for the Cu-Zn alloys in oxy acid solutions. This may be due to the presence of two amino groups adsorbed together. For lysine, inhibition efficiency, IE%, of ~87 and ~59 is for H2SO4 and ~96.3 and 54.9 for HNO3 for alloy I and II respectively are observed. Due to the composition of green water have a great effect on the inhibition action on Cu-Zn alloys which reaching 91.8 and 96.5% for Alloy I and 95.4 and 87.1% for Alloy II in 0.5 M H2 SO4 and HNO3 respectively. Although benzotriazole, in cooling water, is an excellent inhibitor suitable for use in a wide variety of environments, it has toxic properties. So, much of the recent researches have focused on formulating new and more environmentally acceptable preservation solutions. The green tea, as plant extract, will be very environmentally friendly. The EDX confirm the formation of a protective layer on the Cu-Zn alloys containing aluminum in Alloy II. This sequence reflects the beneficial effects of Al in Alloy II. The presence of 2.43% Al in Alloy II improves the corrosion resistance due to the formation of thin, transparent, stable and self-healing Al2 O3 layer. This confirmed the results obtained from the potentiodynamic polarization measurements and EIS methods.

2

Formulation and evaluation of TiO2.Fe2O3 nanopaint

Benitha V. S., Monisha K., Jeyasubramaniyan K.

Archives of Materials Science and Engineering

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2016

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Vol. 77, nr 1

40--44

EN

Purpose: In this project, the formulation of TiO2.Fe2O3 nanopaint was discussed. Design/methodology/approach: The paint was formulated in alkyd resin using ball milling process. Intermolecular bonding between TiO2.Fe2O3 and the alkyd resin was studied by Fourier transform infrared spectroscopy. The water contact angle was measured and it is found to be hydrophilic in nature. The prepared TiO2.Fe2O3 nanopaint disclosed good corrosion-resistant behaviour in acid treatment test. The inhibition efficiency was calculated to ensure the anticorrosive behaviour of paints. Findings: The recorded results reveal that, TiO2.Fe2O3 nanopaint has moderate solid content and mechanically low irregularities compared with bare steel. Corrosion resistance is high in nanoformulated paints and therefore it has high inhibition efficiency. The contact angle reveals the film is hydrophilic in nature which enhance the spreading rate of paints. Research limitations/implications: The method is not limited to TiO2.Fe2O3 nanopaint but is also suitable for the preparation of other nanomaterial-based paint. Originality/value: In this project, iron oxide and titanium oxide act as the corrosion inhibiting pigment.

3

Molibdenian(VI) sodu jako inhibitor korozji stali węglowej

Trela J., Scendo M.

Technical Issues

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2015

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nr 2

47--53

EN

The influence of the concentration of sodium molybdate(VI) on the corrosion of S235 carbon steel in solutions contained chloride and nitrate(V) ions have been studied. For the research purpose a weight loss method has been used. It can be concluded that the addition of Na2MoO4 to the aggressive environment reduces the weight loss of the sample. Inhibition efficiency and corrosion rate have been calculated. The efficiency inhibition of corrosion has been about 93%. It has been found that the corrosion rate of S235 steel, in a solution containing 100 mM sodium molybdate (VI) was about 14 times lower than in the solution without inhibitor. Therefore, the examined compound was an effective inhibitor of the corrosion of S235 carbon steel.

4

Wpływ molibdenianu (VI) sodu na korozję stali węglowej

Trela J., Chat M., Scendo M.

Chemik

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2015

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Vol. 69, nr 9

592--599

PL

Zbadano wpływ stężenia molibdenianu (VI) sodu na korozję elektrochemiczną stali węglowej S235 w kwaśnych roztworach zawierających jony chlorków i azotanowe (V). Na podstawie przeprowadzonych badań wyznaczono parametry: szybkość oraz wydajność inhibitowania reakcji korozji stali. Stwierdzono, że szybkość korozji stali, S235 w roztworze zawierającym 100 mM molibdenianu (VI) sodu jest ok. 18 razy mniejsza niż w roztworze elektrolitu podstawowego. Wydajność inhibitowania reakcji korozji jest wysoka i wynosi 95%. Zatem badany związek jest skutecznym inhibitorem korozji stali węglowej S235.

EN

The influence of the concentration of sodium molybdate (VI) on the corrosion of S235 carbon steel in solutions contained chloride and nitrate (V) ions were studied. Corrosion parameters, inhibition efficiency and corrosion rate were calculated. The efficiency inhibition of corrosion was about 95%. It was found that the corrosion rate of S235 steel, in a solution containing 100 mM sodium molybdate (VI) was about 18 times less than in the solution without inhibitor. Therefore, the examinated compound was an effective inhibitor of the corrosion of S235 carbon steel.

5

Influence of N-(2-chlorobenzylidene)- 4-acetylaniline on the corrosion of St3S carbon steel in chloride solutions

Trela J., Scendo M.

Ochrona przed Korozją

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2013

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nr 3

107--111

EN

The influence of the concentration of N-(2-chlorobenzylidene)-4-acetylaniline (CBAA) and temperature on the corrosion of St3S carbon steel in acidic chloride solutions were studied. For the research was used voltammetric method. An inhibitory effect of N-(2-chlorobenzylidene)-4-acetylaniline on the corrosion investigated steel was found. The efficiency inhibition of corrosion steel increased with an increase in the concentration of CBAA. The adsorption of N-(2-chlorobenzylidene)-4-acetylaniline has been found to occur on the surface of steel according to the Langmuir isotherm at all studied temperatures. The values of adsorption parameters have been appointed. CBAA particles undergo spontaneous physical and chemical adsorption.

PL

Badano wpływ stężenia oraz temperatury na skuteczność działania N-(2-chlorobenzylideno)- 4-acetyloaniliny (CBAA) jako inhibitora korozji stali węglowej St3S w kwaśnych (pH 1,5) wodnych roztworach chlorków (1,2 M Cl-). Do badań stosowano głównie metodę woltamperometryczną. Stwierdzono inhibitujący wpływ N-(2-chlorobenzylideno)-4 acetyloaniliny na korozję stali St3S. Wydajność inhibitowania korozji stali zwiększała się w miarę wzrostu stężenia CBAA (od 0 do 20 mM). Adsorpcja N-(2-chlorobenzylideno)-4-acetyloaniliny na powierzchni stali przebiegała zgodnie z izotermą Langmuira w całym zakresie temperatur. Wyznaczone zostały również wartości standardowe: energii swobodnej (ΔG0 ads), entalpii (ΔG0 ads) i entropii (ΔG0 ads) adsorpcji, wynika z nich, że: cząsteczki CBAA ulegają adsorpcji fizyczne i chemicznej.

6

Wybrane zasady purynowe jako inhibitory korozji stali węglowej

Trela J., Scendo M.

Ochrona przed Korozją

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2012

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nr 5

220-223

PL

Zbadano wpływ stężenia puryny (PU) i adeniny (AD) na proces korozji stali węglowej, St3S (SW) w kwaśnych roztworach chlorków. Stwierdzono, że wydajność inhibitowania korozji badanej stali wzrasta wraz ze wzrostem stężenia inhibitorów w roztworze. Wartości standardowej energii swobodnej adsorpcji świadczą, że zarówno PU jak i AD ulegają adsorpcji chemicznej zgodnie z izotermą Langmuira. Przedyskutowano mechanizm powstawania warstwy ochronnej na powierzchni stali węglowej.

EN

The influence of concentration of purine (PU) and adenine (AD) on the corrosion of St3S (SW) carbon steel in acid chloride solution was studied. The inhibition efficiency increases with increase of concentration of both inhibitors. The values of standard free energies of adsorption prove the chemical adsorption of PU and AD according to Langmuir isotherm. The mechanism of formation the protective layer on the surface of the carbon steel was discussed.

7

Wpływ wybranej zasady Schiffa na korozję stali austenitycznej w środowisku chlorków

Trela J., Scendo M.

Ochrona przed Korozją

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2012

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nr 3

86-91

PL

Badano wpływ stężenia N-(2-chlorobenzylideno)-4-acetyloaniliny (CBAA) na korozję stali austenitycznej, X5CrNi18-10 w kwaśnych roztworach chlorków stosując metody elektrochemiczne. Wydajność inhibitowania korozji stali wzrastała w miarę wzrostu stężenia CBAA i temperatury. CBAA działał jako inhibitor mieszany. Adsorpcja N-(2-chlorobenzylideno)-4-acetyloaniliny na powierzchni stali przebiegała zgodnie z izotermą Langmuira w całym zakresie temperatur. Wyznaczone zostały i przedyskutowane kinetyczne i termodynamiczne parametry korozji stali, X5CrNi18-10 i adsorpcji CBAA. Zaproponowano chemiczno-fizyczny model adsorpcji inhibitora na powierzchni stali.

EN

The influence of the concentration of N-(2-chlorobenzylidene)-4-acetylaniline (CBAA) on the corrosion of X5CrNi18-10 austenic steel in chloride acid solutions was studied by potentiodynamic polarization methods. The corrosion inhibition effi ciency of steel increased with an increase in the concentration of CBAA and temperature. The CBAA acted as a mixed-type inhibitor. The adsorption of N-(2-chlorobenzylidene)-4- acetylaniline has been found to occur on the surface of steel according to the Langmuir isotherm at all studied temperatures. The kinetic and thermodynamic parameters for X5CrNi18-10 corrosion and CBAA adsorption, respectively were determined and discussed. The chemisorption and physisorption for the inhibitor on steel surface was suggested.

8

Wybrane zasady purynowe jako ekologiczne inhibitory korozji miedzi

Scendo M.

Ochrona przed Korozją

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2011

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nr 12

659-663

PL

Badano wpływ stężenia puryny (PU) i jej pochodnej adeniny (AD) na proces korozji miedzi w 0,5 M roztworze NaNO3 (pH 6). Wykazano, że wydajność inhibitowania wzrasta ze wzrostem stężenia PU lub AD. Wartości standardowej entalpii swobodnej adsorpcji świadczą, że PU i AD ulegają chemisorpcji na powierzchni elektrody. Warstwa utworzona przez inhibitory jest szczelna i zapewnia dobrą ochronę miedzi przed korozją.

EN

The influence of the concentration of purine (PU) and its derivative adenine (AD) on the corrosion of copper in a 0.5 M NaNO3 solution (pH 6) was studied. It was shown that the inhibition efficiency increases with the increase in the concentration of PU and AD. The values of the standard free energies of adsorption prove that PU and AD undergo chemical adsorption on the electrode's surface. The adherent layers of both the inhibitors were postulated to account for the protective effect.

9

Inhibition Effect of Nitrogen Containing Ligands on Corrosion of Aluminium in Acid Media with and with out KCl

Sethi T., Chaturvedi A., Upadhyay R. K., Mathur S. P.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 3

591-598

EN

Mass loss and thermometric methods have been used to study the corrosion inhibition of aluminium in HCl solution by nitrogen containing ligands viz. N-(4-N,N-dimethyl - aminobenzal)-p-anisidine (SB1), N-(4-N,N-dimethylaminobenzal)-p-toluidine (SB2) and N-(4-N,N-dimethylaminobenzal)-2,4-dinitroaniline (SB3). Results of inhibition efficiencies obtained from these two methods are in good agreement and have been found to be dependent upon the concentration of inhibitors as well as concentration of acids. Inhibition efficiency of synthesized ligands has also been studied in the presence of KCl with inhibitors.

10

Puryna i adenina jako inhibitory korozji miedzi w kwaśnych roztworach chlorków

Scendo M.

Ochrona przed Korozją

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2006

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nr 12

385-390

PL

Badano wpływ stężenia puryny lub adeniny na proces anodowego roztwarzania miedzi w kwaśnych 1,0 M roztworach chlorków (pH 3,0 i 1,0). Do pomiarów prowadzonych metodą woltamperometrii stosowano stacjonarną elektrodę dyskową (SDE). Dysk wykonany był z elektrolitycznie czystej miedzi (99,99% Cu). Wydajność (skuteczność) inhibitowania (IE) korozji miedzi wzrasta ze wzrostem stężenia PU lub AD (pH 3,0). Działanie inhibitorów polega na utworzeniu dobrze przylegającej warstwy ochronnej. Adsorpcję PU i AD opisuje izoterma Langmuira. Puryna i adenina ulegają chemisorpcji na powierzchni miedzi.

EN

The influence of the concentration of purine (PU) or of adenine (AD) on the anodic dissolution of copper in 1.0 M acidic chloride solutions (pH 3.0 and 1.0) has been studied by means of the voltammetry method, for which a stationary disk electrode (SDE) was used. The disk was made of copper (99.99% Cu). The tests showed that the inhibiting effi ciency (IE) of the corrosion of copper increases together with a rise in the concentration of PU or AD (pH 3.0). Inhibitors create a well adhering protective layer which is postulated to account for their protective effect. The adsorption of PU and AD has been found to occur on the surface of copper according to the Langmuir isotherm. Purine and adenine are chemically adsorbed on the copper surface.