Research of nickel’s electrochemical property in sulfuric acid solution by using potentiodynamic polarization curve.

2015 ◽  
Vol 31 (1) ◽  
pp. 141-147 ◽  
Author(s):  
Bekenova Gulmira ◽  
Baeshov Abduali ◽  
Yılmaz Satılmış
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Polarization Curve ◽  
Sulfuric Acid Solution ◽  
Electrochemical Property ◽  
Potentiodynamic Polarization ◽  
Potentiodynamic Polarization Curve

Electrochemical Investigation of the Adsorption Behaviour of Guanine on Copper in Acid Medium

2013 ◽  
Vol 787 ◽  
pp. 30-34
Author(s):  
Zhi Hua Tao ◽  
Shou Xu Wang ◽  
Lin Xian Ji ◽  
Li Zheng ◽  
Wei He
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Potentiodynamic Polarization ◽  
Eis Measurements ◽  
Cathodic And Anodic Processes ◽  
Inhibition Performance ◽  
Loss Experiment ◽  
Good Agreement ◽  
Mixed Type Inhibitor

The guanine as a corrosion inhibitor for copper in 0.5 mol/L sulfuric acid solution was investigated using weight loss experiment, polarization curves, AC impedance. The results showed that the inhibition performance of the guanine depended on the concentration of the inhibitor and the highest inhibition efficiency of the guanine reached 92.2% at 1×10-3mol/L in 0.5 mol/L sulfuric acid solution. The potentiodynamic polarization measurements showed that both cathodic and anodic processes of copper corrosion were suppressed and the guanine acts essentially as a mixed-type inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization. The adsorption of the guanine is found to obey Langmuir adsorption isotherm and belong to physisorption.

Effects of Magnetic Field on Uneven Dissolution of Iron in Sulfuric Acid Solution with Chlorides

CORROSION ◽  
10.5006/3478 ◽  
2020 ◽  
Vol 76 (6) ◽  
pp. 528-538
Author(s):  
Hongjuan Li ◽  
Fei Ning ◽  
Haiying Dong ◽  
Kun Zhang ◽  
Zhanpeng Lu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Potentiodynamic Polarization ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Uneven Surface ◽  
Potential Sweep ◽  
Active Dissolution

The effects of magnetic field on anodic dissolution and passivation of iron in a sulfuric acid solution with chlorides are investigated by electrochemical measurements and surface observations. In the anodic potentiodynamic polarization curve, the potential for the drastic current drop is not significantly affected by the potential sweep rate under 0 T, which moves in the negative direction with increasing potential sweep rate under 0.4 T magnetic field that is parallel to the working electrode surface. The uneven surface produced during the potentiodynamic polarization hinders the transition from active dissolution to passivation. The area fraction of the locally accelerated dissolution increases with prolonging polarization time at high potentials where the surface film precipitation-dissolution process is the rate-determining step for metal dissolution. Pretreatment under potentiostatic polarization at 0.4 T magnetic field produces an uneven surface that would result in unrecoverable electrochemical states after switching from 0.4 T to 0 T, depending on the applied potential. The positive-feedback mechanism for the magnetic field effect and the surface morphological effect is proposed. The results demonstrate the direct magnetohydrodynamic effect and its resultant uneven surface on the anodic behavior of iron.

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