Potential Sweep and Intensiostatic Pulse Studies of Sn, Sng Hg and Dental Amalgam in Chloride Solution

1979 ◽  
Vol 58 (2) ◽  
pp. 576-583 ◽  
Author(s):  
H. Do Duc ◽  
P. Tissot ◽  
J.-M. Meyer
Keyword(s):  
Chloride Solution ◽  
Chloride Concentration ◽  
Pulse Method ◽  
Dental Amalgam ◽  
Linear Potential ◽  
Anodic Behavior ◽  
Anodic Current ◽  
Potential Sweep

The anodic behavior of the Sn, the Sn8Hg (γ2) phase and the dental amalgam in a chloride solution has been investigated by means of the linear potential sweep and of the intensiostatic pulse method. The results indicate that anodic current varies with chloride concentration and that dissolution occurs prior to passivation of the electrode. The anodic charge needed for the passivation is smallest for the dental amalgam.

On the Origin of the Second Anodic Peak During the Polarization of Stainless Steel in Sulfuric Acid

CORROSION ◽  
10.5006/0820 ◽  
2013 ◽  
Vol 69 (6) ◽  
pp. 536-542 ◽  
Author(s):  
F. Ruel ◽  
P. Volovitch ◽  
L. Peguet ◽  
A. Gaugain ◽  
K. Ogle
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Atomic Emission ◽  
Product Layer ◽  
Anodic Peak ◽  
Current Loop ◽  
Linear Potential ◽  
Anodic Current ◽  
Potential Sweep ◽  
Corrosion Product Layer

The origins of the second anodic current peak in polarization curves of AISI 430 (UNS S43000) stainless steel in deaerated 0.1 M sulfuric acid (H2SO4) have been investigated by potentiodynamic polarization and atomic emission spectroelectrochemistry (AESEC). The elemental dissolution rates of Fe, Cr, Ni, Cu, and Mn were measured in real time during linear potential sweep voltammetry, revealing the formation and dissolution of a copper-rich corrosion product layer. The deposition and subsequent dissolution of this copper layer is proposed to be the main cause of the second anodic current peak. The negative current loop observed after the first anodic peak is attributed to the cathodic reduction of H+ ion on the copper-enriched layer. Other factors such as the oxidation of the adsorbed H atoms on the copper-enriched layer and the presence of chromium-impoverished grain boundaries are shown to have a negligible effect on the second anodic current peak.

Double-layer effect correction in chronoamperometry with linear potential sweep

1968 ◽  
Vol 13 (2) ◽  
pp. 241-249 ◽  
Author(s):  
M. Caselli ◽  
G.O. Ottombrini ◽  
P. Papoff
Keyword(s):  
Double Layer ◽  
Linear Potential ◽  
Potential Sweep ◽  
Layer Effect

scholarly journals Experimental Study of the Microstructural Evolution of Glauberite and Its Weakening Mechanism under the Effect of Thermal-Hydrological-Chemical Coupling

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 99 ◽  
Author(s):  
Shuzhao Chen ◽  
Donghua Zhang ◽  
Tao Shang ◽  
Tao Meng
Keyword(s):  
Sodium Chloride ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Crack Nucleation ◽  
Chloride Concentration ◽  
Solution Concentration ◽  
Expansion Velocity ◽  
Research Subjects ◽  
Characteristic Index ◽  
Chemical Coupling

The microstructures of rock gradually evolve with changes in the external environment. This study focused on the microstructure evolution of glauberite and its weakening mechanism under different leaching conditions. The porosity were used as a characteristic index to study the effect of brine temperature and concentration on crack initiation and propagation in glauberite. The research subjects were specimens of ϕ3 × 10 mm cylindrical glauberite core, obtained from a bedded salt deposit buried more than 1000 m underground in the Yunying salt formation, China. The results showed that when the specimens were immersed in solution at low temperature, due to hydration impurities, cracks appeared spontaneously at the centre of the disc and the solution then penetrated the specimens via these cracks and dissolved the minerals around the crack lines. However, with an increase of temperature, the dissolution rate increased greatly, and crack nucleation and dissolved regions appeared simultaneously. When the specimens were immersed in a sodium chloride solution at the same concentration, the porosity s presented gradual upward trends with a rise in temperature, whereas, when the specimens were immersed in the sodium chloride solution at the same temperature, the porosity tended to decrease with the increase of sodium chloride concentration. In the process of leaching, the hydration of illite, montmorillonite, and the residual skeleton of glauberite led to the expansion of the specimen volume, thereby producing the cracks. The diameter expansion rate and the expansion velocity of the specimen increased with temperature increase, whereas, due to the common-ion effect, the porosity of the specimen decreases with the increase of sodium chloride solution concentration.

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