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.

Corrosion Inhibition of 2-Mercaptobenzothiazole for Carbon Steel in Sulfuric Acid Solution

2012 ◽  
Vol 557-559 ◽  
pp. 92-95 ◽  
Author(s):  
Xiao Feng Liang ◽  
Xue Yang
Keyword(s):  
Sulfuric Acid ◽  
Carbon Steel ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Mixed Type ◽  
Sulfuric Acid Concentration ◽  
Weight Loss Measurement ◽  
Inhibition Effect ◽  
Effects Of Temperature ◽  
Mixed Type Inhibitor

The inhibition effect of 2-Mercaptobenzothiazole (2-MB) against the corrosion of carbon steel in sulfuric acid solution was studied by weight loss measurement and electrochemical measurements(potentiodynamic polarization techniques). The results show that 2-MB acts as a good corrosion inhibitor in sulfuric acid solution. Adsorption of 2-MB is found to obey Langmuir isotherm. Polarization curves indicate 2-MB is a mixed-type inhibitor. The effects of temperature and sulfuric acid concentration were also studied.

Electrochemical Study of Corrosion Inhibition on Copper in Base Electrolyte by 1-Phenyl-3-Hydroxy-1,2,4-Triazole

2014 ◽  
Vol 988 ◽  
pp. 3-7 ◽  
Author(s):  
Qi Li ◽  
Jian Li ◽  
Ling Tong Hu ◽  
Lei Zhu ◽  
Xiao Han ◽  
...  
Keyword(s):  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Chloride Ions ◽  
Circuit Board ◽  
Base Electrolyte ◽  
Polarization Studies ◽  
Eis Measurements ◽  
Inhibition Performance ◽  
Good Agreement

This paper presents the investigation of 1-Phenyl-3-hydroxy-1,2,4-triazole as a new green Cu corrosion inhibitor for Electronic Circuit Board in the base electrolyte (containing 60ppm chloride ions,0.54M H2SO4 and 0.88M CuSO4).The inhibition action was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).The results show that the inhibition performance depends on the concentration of the inhibitor and the inhibition efficiency increases with increasing inhibitor concentration. Potentiodynamic polarization studies show that 1-Phenyl-3-hydroxy-1,2,4-triazole acts as the mixed-type inhibitor.The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.

Electrochemical Investigation of Myclobutanil as Corrosion Inhibitor for Copper in Acid Medium

2014 ◽  
Vol 960-961 ◽  
pp. 229-233 ◽  
Author(s):  
Li Zheng ◽  
Ji Liu ◽  
Zhi Hua Tao ◽  
Wei He ◽  
Ding Jun Xiao ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Investigation ◽  
Eis Measurements ◽  
Good Agreement ◽  
Mixed Type Inhibitor

This paper is mainly to discuss that myclobutanil as corrosion inhibitor and its corrosion efficiency were evaluated via electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The potentiodynamic polarization measurements showed that the inhibition efficiency increases sharply with the increasing of concentration of myclobutanil, and the highest inhibition efficiency of the myclobutanil reached 84.3% at 3.2×10-4 mol/L in 1 mol/L HCl. The result also indicated that myclobutanil belongs to the mixed type inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.

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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