An XPS and AES study of the free corrosion of Cu-, Ni- and Zn-based alloys in synthetic sweat

Colin, Stéphane; Bêche, Eric; Berjoan, R.; Jolibois, H.; Chambaudet, A.

doi:10.1016/s0010-938x(98)00141-3

Cited by 71 publications

(41 citation statements)

References 62 publications

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“…The electrochemical experiments were performed in synthetic sweat solution [14] with a pH of 6.50 (adjusted by adding ammonia (solution in water, 28-30% NH 3 , ACS Reagent)), which was composed of 0.5% sodium chloride (99 þ%, ACS Reagent), 0.1% lactic acid (85 þ%, solution in water, ACS Reagent), 0.1% urea (99 þ%, ACS Reagent). A classic three-electrode cell configuration was used, in which a Pt plate was the counter electrode, and saturated calomel electrode (SCE) was the reference electrode.…”

Section: Experimental Media and Methodsmentioning

confidence: 99%

Anti‐tarnish treatment of brass for coinage

Wang

Liu²,

Zhang

2007

Materials & Corrosion

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The anti-tarnish film was formed on brass for coinage by 1-phenyl-5-mercaptotetrazole (PMTA), which was studied by accelerated corrosion test (metallic coatings-thioacetamide corrosion test), polarization curves and electrochemical impedance spectroscopy (EIS) in synthetic sweat solution. The accelerated corrosion test showed that PMTA exhibited better anti-tarnish performance on brass than that of traditional anti-tarnish agent benzotriazole (BTA). The polarization measurements showed that PMTA could be classified as a mixed inhibitor for it could restrain both anodic and cathodic reactions. EIS measurements indicated that the inhibition efficiency of PMTA on brass was over 98.4% in synthetic sweat solution. All these results showed that PMTA was an excellent anti-tarnish agent of the brass for coinage, the optimum treating conditions of which were 0.5 gL À1 , pH ¼ 3, 55 C-85 C, 7 min.

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Section: Experimental Media and Methodsmentioning

confidence: 99%

Anti‐tarnish treatment of brass for coinage

Wang

Liu²,

Zhang

2007

Materials & Corrosion

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“…During the corrosion of copper alloys, copper dissolution eventually creates CuCl 2 − species which form cuprous oxide as the local pH at the interfaces increases [30,33,61]:…”

Section: Potentiodynamic Polarizationmentioning

confidence: 99%

Metal Matrix Composite Coatings of Cupronickel Embedded with Nanoplatelets for Improved Corrosion Resistant Properties

Thurber

Ahmad

Calhoun

et al. 2018

International Journal of Corrosion

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The deterioration of metals under the influence of corrosion is a costly problem faced by many industries. Therefore, particlereinforced composite coatings are being developed in different technological fields with high demands for corrosion resistance. This work studies the effects of nanoplatelet reinforcement on the durability, corrosion resistance, and mechanical properties of copper-nickel coatings. A 90 : 10 Cu-Ni alloy was coelectrodeposited with nanoplatelets of montmorillonite (Mt) embedded into the metallic matrix from electrolytic baths containing 0.05, 0.10, and 0.15% Mt. X-ray diffraction of the coatings indicated no disruption of the crystal structure with addition of the nanoplatelets into the alloy. The mechanical properties of the coatings improved with a 17% increase in hardness and an 85% increase in shear adhesion strength with nanoplatelet incorporation. The measured polarization resistance increased from 11.77 kΩ⋅cm 2 for pure Cu-Ni to 33.28 kΩ⋅cm 2 for the Cu-Ni-0.15% Mt coating after soaking in a simulated seawater environment for 30 days. The incorporation of montmorillonite also stabilized the corrosion potential during the immersion study and increased resistance to corrosion.

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“…Jensen et al compared the corrosive action of palm hand sweat with ''rusters'' on two different steels and showed that corrosion rates increased with increased sweat rates, and he reported that the copper in steel was beneficial in reducing the corrosion of steel in presence of sweat [16]. Colin et al focused on the composition of the corrosion layers on some of ternary copper alloys in synthetic sweat medium using Fourier transform mass spectrometer and laser microprobe mass analyser [17,18]. Colin's results showed that the corrosion product thickness layer increased with an increase in copper content.…”

Section: Cu-10al-10znmentioning

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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An XPS and AES study of the free corrosion of Cu-, Ni- and Zn-based alloys in synthetic sweat

Cited by 71 publications

References 62 publications

Anti‐tarnish treatment of brass for coinage

Anti‐tarnish treatment of brass for coinage

Metal Matrix Composite Coatings of Cupronickel Embedded with Nanoplatelets for Improved Corrosion Resistant Properties

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

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