scholarly journals Effect of anodic dissolution and passivation on X80 steel in NaHCO3 solution

2020 ◽  
Author(s):  
Lai-Shun Yang ◽  
Chao Yang
Keyword(s):  
Anodic Dissolution ◽  
Double Layer ◽  
Formation Mechanism ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Reaction ◽  
Stray Current ◽  
Potentiodynamic Polarization Curve ◽  
Anodic Current ◽  
X80 Steel

AbstractThe effects of extreme stray current on the anodic dissolution and passivation of X80 steel in NaHCO3 solution were investigated using measurements of polarization curves and EIS, AFM and SEM techniques. Under the interference of anodic current (i = 0~200 A/m2), main constituents of corrosion products of X80 steel were FeO(OH) and Fe3O4. A double-layer film formed at i = 100 A/m2, in which FeOOH was in outer and Fe3O4 lied in inner. The formation mechanism of Fe3O4 was confirmed and described by the electrochemical reaction in various regions on anodic potentiodynamic polarization curve.

Electrochemical Behavior of Mg in H3PO4 and Phosphating Solution

2014 ◽  
Vol 1081 ◽  
pp. 318-321 ◽  
Author(s):  
Dao Bing Huang ◽  
Yuan Qiang Tu ◽  
Ting Hu ◽  
Guang Ling Song ◽  
Xing Peng Guo
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Potentiodynamic Polarization Curve

The electrochemical behavior of pure Mg in H3PO4 acid (0.42 M) and phosphating solution (0.42 M H3PO4+0.34 M ZnO) was investigated through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curve and XRD measurements. The results show that Mg has higher corrosion resistance in the phosphating solution than that in the H3PO4 acid which may be due to the relative protective phosphating film on the surface.

scholarly journals Synthesis, characterization and corrosion inhibition behavior of 2-aminofluorene bis-Schiff bases in circulating cooling water

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17816-17828 ◽  
Author(s):  
Wenchang Wei ◽  
Zheng Liu ◽  
Chuxin Liang ◽  
Guo-Cheng Han ◽  
Jiaxing Han ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Schiff Bases ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Cooling Water ◽  
Potentiodynamic Polarization Curve ◽  
Circulating Cooling Water

Two new bis-Schiff bases, namely 2-bromoisophthalaldehyde-2-aminofluorene (M1) and glutaraldehyde 2-aminofluorene (M2) were synthesized and were characterized, the potentiodynamic polarization curve confirmed that they were anode type inhibitors.

Microbiologically Influenced Corrosion of Fe3Al/ZrO2 Composites in Marine Environment

2009 ◽  
Vol 79-82 ◽  
pp. 2251-2254
Author(s):  
Xue Ting Chang ◽  
Shou Gang Chen ◽  
Yan Sheng Yin
Keyword(s):  
Passive Film ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
High Hardness ◽  
Impedance Spectrum ◽  
Microbiologically Influenced Corrosion ◽  
Electrochemical Impedance Spectrum ◽  
Potentiodynamic Polarization Curve ◽  
Corrosion Resistant

Electrochemical impedance spectrum (EIS) and potentiodynamic polarization curve were applied to invest the corrosive behavior of Fe3Al/ZrO2 composites with different components in marine microbial medium. The results indicated that the existence of microbiology negatively moved the open circle potential. When the composites contained 30% (wt %) ZrO2, the passive film on electrodes surface was the thickest one, even after 25 days the material was still protected. When the content of ZrO2 was 90%, Fe3Al was in the least content, after 25 days the passive film has disappeared, but the material was still not eroded because of the high hardness and corrosion-resistant properties of ZrO2. When the content of ZrO2 was 80%, the passive film was partly damaged, which could lead to more serious local corrosion.

Electrochemical Properties of Type 304 Stainless Steels Produced by Several Methods

2007 ◽  
Vol 539-543 ◽  
pp. 3225-3230
Author(s):  
Satoshi Sunada ◽  
Takahisa Yamamoto ◽  
Kazuhiko Majima
Keyword(s):  
Polarization Curve ◽  
Stainless Steels ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
Nyquist Plot ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Potentiodynamic Polarization Curve ◽  
Molding Process ◽  
Type 304

Three kinds of Type 304 stainless steels: the first one was made by the conventional wrought process (I/M), the second one by conventional powder metallurgy process (P/M) and the third one by Metal Injection Molding process (MIM), were used. The corrosion behavior of these specimens was investigated through the potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy method. In addition, SCC characteristics were also studied. Both the potentiodynamic polarization curve and the Nyquist plot curve of MIM specimen were similar to those of I/M specimen, but different from those of P/M specimens. Therefore it might be suggested that MIM process is quite suitable to improve the corrosion resistance. On the other hand, time constants of P/M and MIM specimens are similar, but they differed remarkably from that of I/M specimen, which is considered to be due to the remained pores in P/M and MIM specimens. Further, it was also confirmed that the SCC was more liable to take place on I/M specimen than MIM specimen.

Structure and Properties of Anodized Films Formed on AZ91D Magnesium Alloy

2011 ◽  
Vol 66-68 ◽  
pp. 1586-1591
Author(s):  
Jian San Li ◽  
Jun Quan Liu
Keyword(s):  
Magnesium Alloy ◽  
Current Density ◽  
Potentiodynamic Polarization ◽  
Solution Structure ◽  
Solution Temperature ◽  
Anodic Current Density ◽  
Polarization Analysis ◽  
Structure And Properties ◽  
Anodic Current ◽  
Az91d Magnesium Alloy

Anodized films on AZ91D magnesium alloy were prepared in sodium hydroxide based solution. Structure and properties of the anodized films were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical potentiodynamic polarization analysis. The results of XRD showed that the films were mainly composed of Mg(OH)2and Al(OH)3. As the solution temperature increasing, the anodized films became thicker and denser, which could cover up the substrate. The films also became thicker and denser with the increase of anodizing time. The grain in the films grew fast when anodic current density increasing and a larger grain size would be found at a higher anodic current density. The results of microscopic analysis exhibited the porous-type anodic oxide, which was similar to the films on aluminum alloy. The results of electrochemical potentiodynamic polarization analysis showed that thermodynamic stability of the alloy had a certain improvement after anodization. The anodized films also exhibited an obvious increase of polarization resistanceRPand an obvious decrease of corrosion current densityic. Discoloration time of drop test on the films lasted for 30 min, which indicated that corrosion resistance of the magnesium alloy was greatly improved by anodization.

Pitting Corrosion of Zn Peculiarly Caused by Acetate Anions

2016 ◽  
Vol 230 (10) ◽  
Author(s):  
Hesham S. Abdel-Samad ◽  
Hamdy H. Hassan
Keyword(s):  
Passive Film ◽  
Pitting Corrosion ◽  
Potentiodynamic Polarization ◽  
Corrosion Behaviour ◽  
Passive Layer ◽  
Acetate Solution ◽  
Layer Formation ◽  
Potentiodynamic Polarization Curve ◽  
Pitting Potential ◽  
Formation Region

AbstractThe corrosion behaviour of zinc metal was studied in acetate solutions. The potentiodynamic polarization curve in 0.1 M acetate solution displays an anodic peak (A1) owing to the anodic dissolution of zinc followed by a passive layer formation region. Breakdown of the passive film and the initiation of pitting corrosion were observed beyond the pitting potential (

Sign in / Sign up

Export Citation Format

Share Document