Environmentally safe corrosion inhibition of the Cu–Ni alloys in acidic sulfate solutions

Badawy, W. A.; Ismail, Khaled M.; Fathi, Ahlam M.

doi:10.1007/s10800-005-4741-6

Cited by 50 publications

(22 citation statements)

References 24 publications

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“…The corrosion inhibition process is based on the adsorption of the amino acid molecules on the active sites and/or deposition of the corrosion products on the alloy surface [8,9]. The atoms of O and N from lysine molecule serve as active centers for the process of the amino-acid adsorption on the metal surface.…”

Section: Resultsmentioning

confidence: 99%

Lysine as corrosion inhibitor for low alloy carbon steel in acidic media

Jano

Lame

Kokalari

2014

Analele Universitatii "Ovidius" Constanta - Seria Chimie

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The use of inhibitors is one of the most practical means for protecting metals against corrosion, especially in acidic media. The interest is to use organic compounds as inhibitors due mainly to their inherent and non-toxic nature. Amino acids are attractive as corrosion inhibitors because they are nontoxic, relatively easy to produce with high purity at low cost, and are soluble in aqueous media. Lysine, one kind of amino acid is used as inhibitor. The aims of this study are to show corrosion protection efficiency of lysine and to explain the mechanism of corrosion. The experimental results demonstrated that the lysine offered protection for low alloy carbon steel in aggressive environments like H 2 SO 4 . Materials under investigation are two types of low alloy carbon steel marked as: Steel 39, Steel 44 (usually applied to concrete as reinforcing bars). The corrosion media consists in sulfuric acid in presence of chloride ions, in form of NaCl (H 2 SO 4 1M + Cl -10 -3 M). Potentiodynamic polarization methods are used for inhibitor efficiency testing. Potentiodymanic polarization measurements showed that the presence of lysine in acidic solution decreases the corrosion current to a good extent. The corrosion inhibition efficiency improves with the increase of the lysine concentration. The use of this inhibitor (1g/L) protects steel 39 in acidic media with 78.88% efficiency. That means lysine is a good corrosion inhibitor for these aggressive conditions.

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Section: Resultsmentioning

confidence: 99%

Lysine as corrosion inhibitor for low alloy carbon steel in acidic media

Jano

Lame

Kokalari

2014

Analele Universitatii "Ovidius" Constanta - Seria Chimie

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“…Dakle, adsorpciona moć amino kiselina raste u prisustvu hloridnih jona. [17]. Cistein i metionin su pogodne amino kiseline jer obe sadrže amino grupu i SH grupu (cistein), odnosno S-CH 3 (metionin), tj.…”

Section: Slika 8 -Polarizacione Krive Bakra U Prisustvu Različitih Kounclassified

Amino acids as copper corrosion inhibitors in 0.05M HCl

Medic¹,

Antonijević²,

Milić³

et al. 2015

Zas Mat

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Amino kiseline kao inhibitori korozije bakra u 0.05M HCl IZVODPovećana zabrinutost stručne i naučne javnosti za očuvanje životne sredine, dovela je do sve veće upotrebe ekološki prihvatljivih inhibitora za zaštitu metala od korozije. U ovom radu ispitivana je mogućnost zaštite bakra od agresivne hlorovodonične kiseline, korišćenjem amino kiselina kao "zelenih inhibitora". Ispitivane su inhibitorske osobine različitih koncentracija cisteina, metionina i alanina na bakarnoj elektrodi u 0.05M rastvoru hlorovodonične kiseline i to korišćenjem metoda kao što su: merenje potencijala otvorenog kola, linearna voltametrija i ciklična voltametrija. Nađeno je da najbolja inhibitorska svojstva pokazuje cistein pri koncentraciji od 1·10-2 mol/dm 3 . Ključne reči: amino kiseline, bakar, hlorovodonična kiselina. UVODZbog velikog značaja u industriji i njegove širo-ke primene, bakar je predmet brojnih istraživanja još od 1920. godine [1].Bakar i njegove legure imaju široku primenu u pomorskim uslovima zbog svoje korozione otpornosti, mehaničke obradivosti, odlične električne i termičke provodljivosti i zbog nemogućnosti prijanjanja živih organizama na njegovu površinu, jer su kupri joni izuzetno toksični [2].Iako je bakar u velikoj meri otporan na koroziju u nekompleksirajućim rastvorima, u prisustvu kompleksirajućih jona, kao što su hloridni joni, može pretrpeti ozbiljna oštećenja. Prema Purbeovim dijagramima za bakar u hloridnim rastvorima, na pH 6, glavni korozioni produkt je CuCl koji formira stabilni sloj na površini metala, te na taj način prevodi metal u pasivno stanje [3]. Modestov i sar.[4] su pokazali da se u 0,5M hloridnom rastvoru, na pH vrednosti od 5,7 i nižim vrednostima, na bakarnoj površini formira CuCl film ispod koga se nalazi oksidni sloj Cu 2 O, koji ne pruža dovoljan stepen zaštite.Među mnogobrojnim dostupnim metodama za smanjivanje posledica korozije, upotreba inhibitora je jedan od najpraktičnijih i najisplativijih izbora. Primećeno je da se upotrebom organskih jedinjenja koja u sebi sadrže heteroatome azota, sumpora i fosfora postiže visok stepen zaštite bakra od korozije [5]. Prvi korak u aktivacionom mehanizmu ovih jedinjenja je adsorpcija na metalnoj površini. Za odvijanje procesa adsorpcije neophodno je postojanje privlačnih sila između adsorbata i površine metala. Prema tipu sile koja je zastupljena, adsorpcija može biti: fizička, hemijska ili kombinacija ovih dveju. Fizisorpcija se javlja kao posledica postojanja elektrostatičke sile privlačenja između inhibirajućih organskih jona ili dipola i naelektrisane površine metala. Hemisorpcija je posledica interakcije između nevezivnih elektronskih parova ili p-elektrona adsorbata sa metalom, u cilju formiranja veze koordinativnog tipa. Kod adsorbovanih molekula, hemisorpcija se može javiti u prisustvu heteroatoma (P, Se, S, N, O) koji imaju nevezivne elektronske parove, ili aromatične prstenove. Prema ovom mehanizmu smanjenje brzine katodne ili anodne ili obe reakcije, proističe iz adsorpcije inhibitora na aktivnim mestima korozije, na površini metala [...

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“…Copper-zinc alloys are important in civil engineering, as condenser and heat-exchange tubes in the power generation industry, and also as a decorative material in works of art. There are numerous publications on the electrochemical behavior and corrosion resistance of CuNi and Cu-Zn [1][2][3][4][5][6][7] alloys in different solutions. Recently, copper and many copper alloys have been used as antibacterial materials.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Stability of Cu–10Al–10Zn, Cu–10Al–10Ni, and Cu–10Ni–10Zn Ternary Alloys in Simulated Physiological Solutions

Nady

El-Rabiei

2016

J Bio Tribo Corros

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Copper-based alloys are widely used in the consumer electronics industry for components such as connector contacts, shielding gaskets, and terminals. Nickel silver is a general term for alloys that contain copper, nickel, and zinc. Nickel silver first became popular as a base metal for silver-plated cutlery and other silverware, notably electro-plated nickel silver, jewelery and coins. In this article, the electrochemical stability of Cu10Ni-10Zn alloy was compared with that of pure copper and two of copper ternary alloys, namely Cu-10Al-10Zn and Cu-10Al-10Ni in synthetic sweat solution, Hank's solution and in Ringer physiological solution. Corrosion behavior of the different electrodes was investigated using cyclic voltammetry, potentiodynamic polarization, and impedance spectroscopy techniques. The CVs showed peaks concerning the redox reactions for copper. These peaks were assigned to the formation and reduction of copper species. Furthermore, they showed that the copper oxidation was suppressed to a large extent by the presence of Ni and zinc in the alloy composition than the presence of Al and Zn or the presence of Al and Ni elements. Also, the results showed that the Cu-10Ni-10Zn alloy exhibited good corrosion resistance due to the formation of a protective passive film. The electrochemical impedance spectroscopy results indicated that either a duplex film with an inner barrier layer and an outer porous layer or a single passive layer was formed on the surface. The formation of such passive film was discussed, and the different alloy surfaces examined by scanning electron microscopy and subjected to EDAX analysis. The surface analysis has shown the participation of the different alloying elements in the passive film according to the alloy constituents.Graphical Abstract Addition of Ni decreases the rate of corrosion of the Cu, and the Cu-10Ni-10Zn was found to be the most corrosion-resistant alloy.

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Environmentally safe corrosion inhibition of the Cu–Ni alloys in acidic sulfate solutions

Cited by 50 publications

References 24 publications

Lysine as corrosion inhibitor for low alloy carbon steel in acidic media

Lysine as corrosion inhibitor for low alloy carbon steel in acidic media

Amino acids as copper corrosion inhibitors in 0.05M HCl

Electrochemical Stability of Cu–10Al–10Zn, Cu–10Al–10Ni, and Cu–10Ni–10Zn Ternary Alloys in Simulated Physiological Solutions

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