Electrochemical Behavior of Sn-Ag Alloys in Sodium Fluoride Solutions

Ameer, M.A.; Ghoneim, A. A.; Fekry, Amany M.; Heakal, F. El-Taib

doi:10.1002/mawe.200500005

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…The n value was found equal to 0.613, 0.311, 0.616, 0.498, 0.368, and 0.368 for samples I-VI, respectively. The results reveal that alloy II has the lowest corrosion rate among the studied six samples, in agreement with the open circuit results and those reported previously on the same samples [14,18], where the corrosion vulnerability increases in the sequence II (low) < V < IV, VI < I, III (high). It seems that an important factor which control the corrosion behavior of Sn-Ag alloy is its solid phase composition, hence the intermetallic phase 26Sn-Ag (sample II) as well as the eutectic phase 96.5Sn-Ag (sample V) are the two compositions exhibiting better anti-corrosion properties.…”

Section: Effect Of Concentrationsupporting

confidence: 82%

“…On examining the data, it seems that the total resistance (R T ) value, which determines the resistive property of the oxide layer, is a suitable indicative parameter for explaining the role of the solid phase composition on the passive film behavior of Sn-Ag alloys at different sulfate concentrations. Also, the reciprocal capacitance of the passive film (1/C) is directly proportional to its thickness [14,24]. As indicated by the results of Table 3 and Fig.…”

Section: Electrochemical Impedance Measurementssupporting

confidence: 51%

“…Four samples of the binary xSn-Ag alloys (x ¼ 26, 50, 70, and 96.5 wt%), denoted as samples II, III, IV, and V, respectively, [14] were supplied by Leybold Heraeus GmbH in the form of rods each 2 cm in length and 1 cm in diameter, and their compositions were checked by energy-dispersive spectroscopy (EDS) analysis. Pure samples (99.95%) of silver (I) and tin (VI) metals in rod forms with different radii were provided by Goodfellow Cambridge, Ltd (UK).…”

Section: Methodsmentioning

confidence: 99%

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The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

Ameer

Ghoneim

Fekry

2010

Materials & Corrosion

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The corrosion and passivation behavior of four binary xSn-Ag (x ¼ 26, 50, 70, and 96.5 wt%) alloys and their pure metal components was investigated in sodium sulfate solutions using electrochemical techniques. The influence of two different electrolytic parameters, namely, concentration (0.01-1.0 M) and pH (3.0-11.0) were studied while the specimens were potentiodynamically polarized between À1000 and 500 mV versus saturated calomel electrode (SCE). The results showed that the corrosion current density (i corr ) increases with increasing either the tin content in the alloy or the SO 2À 4 ions concentration in the electrolyte. Increasing the pH value of a constant composition sulfate solution was found to improve the corrosion resistance of the tin-richer alloys (x ¼ 50-96.5 wt%), and decreases a little the stability of the silver-rich one (74 wt% Ag). Impedance measurements at the free corrosion potential (E corr ) give good support for these results, where a small addition of tin to silver up to the intermetallic ratio (x ¼ 26 wt%) gives an alloy with better corrosion resistance to the aggressive sulfate medium. In terms of the tin ratio, the order of surface film stability on the tested samples, generally follows the ranking: 26 > 96.5 > 50 > Ag > 70 > Sn. The good corrosion resistance of the tin-rich alloy (x ¼ 96.5 wt%), surpassing those for the pure constituents tin and silver can be attributed to the homogenous phase structure of this eutectic mixture.

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Section: Effect Of Concentrationsupporting

confidence: 82%

Section: Electrochemical Impedance Measurementssupporting

confidence: 51%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

Ameer

Ghoneim

Fekry

2010

Materials & Corrosion

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“…Both the cathodic and anodic curves exhibit Tafel behavior. These results enable the determination of various electrochemical corrosion parameters of the two electrodes using Thales software for i/E analysis [20][21][22].…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 99%

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

2009

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Polyvinylsilsesquioxanes (PVS) coatings were synthesized by the hydrolytic polycondensation of vinyltrimethoxysilane using hydrochloric acid as a catalyst. Their structure was characterized by Fourier transform IR (FTIR) and the viscosity [in centipoise(cP)] of polyvinylsilsesquioxanes was measured at 298 K. The electrochemical behavior of I-IV coated steel electrodes, of polymer concentration as follows: [I(20%), II(40%) of viscosity 50 cP and III(20%), IV(40%) of viscosity 15 cP], was investigated in 3% NaCl solution using various electrochemical techniques, i.e., opencircuit potential (OCP), potentiodynamic polarization, electrochemical impedance measurements (EIS), and surface examination via scanning electron microscope (SEM) technique. The influence of immersion time on the electroctrochemical behavior of polysilsesquioxane-coated electrodes was also studied. The results of polarization measurements showed that corrosion current density (i corr ) decreases in the order IV [ III [ II [ I. Also, the film resistance is the highest for PVS-coated electrode I as evaluated from EIS measurements. OCP, EIS, and polarization results are in good agreement with each other. The obtained results were confirmed by surface examination using scanning electron microscope.

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“…Duckett et al [5] observed that addition of tin metal to silver metal increased progressively the hardness and tensile strength of silver. In an earlier article [6,7] , the electrochemical behavior of four Sn-Ag alloy samples was investigated in NaF and NaOH solutions and the results were compared with the behavior of their pure metals tin and silver.…”

Section: Introductionmentioning

confidence: 99%

Interface analysis of pure Sn, pure Ag and SnAg binary alloys in H₂SO₄

Ameer

Ghoneim

Heakal

et al. 2010

Surface & Interface Analysis

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The electrochemical and passivation properties of three selected binary xSn-Ag (x = 26, 50 and 70 wt%) alloys were studied by means of open-circuit potential variation, potentiodynamic curves and a.c. impedance spectroscopy techniques.The specimens were polarized between −1.0 and 0.5 V versus saturated calomel electrode (SCE) in naturally oxygenated sulfuric acidsolutions of different concentrations The experimental results indicate that i corr increases with increasing either the acid concentration or the Sn content in the solid phase. Electrochemical impedance spectroscopyresults measured at the free corrosion potential confirm that alloy I (26Sn-Ag) characterizes by thicker passive film with higher protective ability compared to the other two samples richer in tin component. The exponential variation of the relative thickness of the surface film on any of the tested samples assumes an almost constant thickness for a thin barrier layer and a much larger outer porous layer that dominates the total film thickness on the alloy.

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Electrochemical Behavior of Sn-Ag Alloys in Sodium Fluoride Solutions

Cited by 8 publications

References 29 publications

The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

Interface analysis of pure Sn, pure Ag and SnAg binary alloys in H₂SO₄

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Electrochemical Behavior of Sn-Ag Alloys in Sodium Fluoride Solutions

Cited by 8 publications

References 29 publications

The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

The electrochemical behavior of Sn–Ag binary alloys in sulfate solutions

Corrosion protection of mild steel by polyvinylsilsesquioxanes coatings in 3% NaCl solution

Interface analysis of pure Sn, pure Ag and SnAg binary alloys in H2SO4

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Interface analysis of pure Sn, pure Ag and SnAg binary alloys in H₂SO₄