Corrosion of Zn in deaerated sulphate solutions at different pH values

Gmytryk, M.; Sędzimir, J.

doi:10.1016/s0010-938x(67)80010-6

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…7 give sufficient agreement in those cases in which the anodic Tafel lines can be extrapolated to the corrosion potential. In the pH region under discussion, this process is dependent on the convective diffusion of the hydrogen ions (23)(24)(25), so the corrosion of zinc in aqueous solutions of lithium chloride is dependent on stirring (Fig. Generally, extrapolation of Tafel lines is prevented by the formation of surface layers which give curved Tafel lines.…”

Section: Fig 7 Steady-state Polarization Curves For Zinc In H20/licmentioning

confidence: 99%

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Corrosion Studies on Zinc in a Methanol/Water/Lithium Chloride/Oxygen System

Banaś

Schütze

Heitz

1986

J. Electrochem. Soc.

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The corrosion of zinc displays different effects in methanolic and aqueous chloride solutions. Since there is no surface layer formation, corrosion takes place at a higher rate in methanol than in aqueous solutions. An evaluation of the polarization curves gives different kinetic parameters. The marked effect of chloride ions in methanol solutions is noticeable even in the ppm region, as well as the rise in acidity in aqueous solutions with a high chloride ion concentration. Small amounts of water in methanol have an inhibiting effect. At higher water content, the structure of the solution exerts an influence, and a corrosion rate maximum is reached in the region of 10 to 20 moll -1. Zinc corrosion in ethanol is similar to that in methanol, but the rates are lower.

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Section: Fig 7 Steady-state Polarization Curves For Zinc In H20/licmentioning

confidence: 99%

“…This indicates that the corrosion of zinc is controlled by the cathodic reduction of hydrogen ions. In the pH region under discussion, this process is dependent on the convective diffusion of the hydrogen ions (23)(24)(25), so the corrosion of zinc in aqueous solutions of lithium chloride is dependent on stirring (Fig. 9).…”

Section: -6mentioning

confidence: 99%

Corrosion Studies on Zinc in a Methanol/Water/Lithium Chloride/Oxygen System

Banaś

Schütze

Heitz

1986

J. Electrochem. Soc.

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“…The understanding of anodic behaviour of zinc is therefore of great interest. Although the formation, composition and properties of the anodic passive layers on zinc in aqueous media have been the matter of many publications in recent decades (Armstrong and Bell, 1974;Brood and Leger, 1976;Leidheiser, 1987;Graedel, 1989;Walter and Madurasinghe, 1989;Hiskima et al, 1991;Bech Nielsen and Juhl, 1993;Zhang, 1995), there is a shortage of information in the literature on the electrochemical behaviour of Zn in Na 2 SO 4 solutions (Gmytryk and Sedzimir, 1967;Baugh, 1979;Deslouis et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Passivity and passivity breakdown of zinc anode in sulphate solutions

Aal

1999

Anti-Corrosion Methods and Materials

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The electrochemical behaviour of zinc in different concentrations of Na 2 SO 4 (pH = 6.0) was investigated using the potentiodynamic anodic polarization single sweep and cyclic voltammogram techniques. The anodic portion is characterized by one distinct peak corresponding to Zn(OH) 2 or ZnO. This is followed by a passive region up to a certain potential; the passive current suddenly rises steeply without any sign of oxygen evolution. This denotes the breakdown of the passive film and initiation of pitting corrosion. It was found that the breakdown potential depends on the sulphate concentration, type of aeration, scan rate, solution temperature and pH. The pitting initiation may be explained through the adsorption of SO 4 2± anion on the oxide film formed.This decreases the repair efficiency and causes further metal dissolution. From the cyclic voltammogram of zinc in different concentrations of Na 2 SO 4 , it was found that the change in the integrated anodic charge, Áq a , which is taken as a measure of the extent of pitting, varies linearly with concentration of SO 4 2± anion.

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“…Although C S is affected by both bulk solution concentration and temperature (as shown in Figures 3 and 6), it is reasonable to use a fixed highly concentrated solution to simulate the pit solution, as it was reported that E corr of Zn is almost independent of pH and concentration of Zn 2+ in an acidic concentrated solution. 52 The corrosion potential of the Zn electrode was measured in the 4.4 M Zn(ClO 4 ) 2 pit-like solution at different temperatures from 20 to 50 • C and the results are shown in Figure 8. Increasing temperature resulted in increasing E corr .…”

Section: Effect Of Bulk Clomentioning

confidence: 99%

Dissolution Kinetics of Pure Zinc: The Effect of Bulk Solution Concentration and Temperature Studied by the Lead-In Pencil Electrode Technique

Nakhaie

Asselin

2017

J. Electrochem. Soc.

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The lead-in pencil electrode technique was employed to study the dissolution kinetics of pure zinc in 0.01 M to 1.0 M perchlorate solution from 20-50 • C. The limiting current density (i lim ) during diffusion controlled dissolution and the transition potential (E T ) between diffusion controlled and activation/ohmic controlled dissolution were measured. It was found that both i lim and E T decrease with decreasing bulk solution concentration, while the degree of supersaturation required for salt precipitation remained nearly constant. Increasing temperature increased the i lim and E T , whereas, the degree of supersaturation decreased with temperature. A model for anodic dissolution kinetics within the pit was used to interpret the effect of bulk solution concentration and temperature on E T . It was shown that for a constant temperature, resistance overpotential inside the pit governs the dissolution kinetics at various perchlorate concentrations, while the contribution of the corrosion potential for saturated pit solution and the IR drop within the pit determine the overall E T value at different temperatures.

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Corrosion of Zn in deaerated sulphate solutions at different pH values

Cited by 12 publications

References 4 publications

Corrosion Studies on Zinc in a Methanol/Water/Lithium Chloride/Oxygen System

Corrosion Studies on Zinc in a Methanol/Water/Lithium Chloride/Oxygen System

Passivity and passivity breakdown of zinc anode in sulphate solutions

Dissolution Kinetics of Pure Zinc: The Effect of Bulk Solution Concentration and Temperature Studied by the Lead-In Pencil Electrode Technique

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