Study on Accelerated Corrosion Electrochemical Behavior of Q235B Steel in Sea Water

2012 ◽  
Vol 229-231 ◽  
pp. 40-43
Author(s):  
Yong Liu ◽  
Xing Hua Tong ◽  
Bao Guo Li ◽  
Yan Gang Wang ◽  
Lin Sen Zhu
Keyword(s):  
Corrosion Rate ◽  
Electrochemical Behavior ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Initial Period ◽  
Polarization Curves ◽  
Positive Role ◽  
Accelerated Corrosion ◽  
Tafel Polarization ◽  
Corrosion Electrochemical Behavior

In order to study the corrosion behavior of Q235B steel in seawater at Weihai, the indoor simulated and accelerated corrosion test is carried out by adding H2O2 in seawater. Tafel polarization curves and electrochemical impedance spectroscopy (EIS) techniques are employed to investigate the corrosion electrochemical behavior of Q235B steel. Polarization curves and EIS are acquired by electrochemical workstation. From polarization curves, it is found that the corrosion rate rises rapidly during the initial period, and it becomes highest on the 3rd day, then drops, and tends to be stable after about 15 days. After that, the corrosion rate reduces slowly due to the covering effect of corrosion products, and then the conclusion is confirmed by EIS analysis. Analytical results indicate that the rust layer plays a positive role of hindering the corrosion process.

Study on Corrosion Electrochemical Behavior of X42 and 16Mn Steel in Seawater

2013 ◽  
Vol 364 ◽  
pp. 599-602
Author(s):  
Bao Guo Li ◽  
Xing Hua Tong ◽  
Yong Liu ◽  
Yan Gang Wang ◽  
Lin Sen Zhu
Keyword(s):  
Electrochemical Behavior ◽  
Electrochemical Method ◽  
Electrochemical Impedance ◽  
Corrosion Process ◽  
Polarization Curves ◽  
Natural Seawater ◽  
Tafel Polarization ◽  
Corrosion Scale ◽  
16Mn Steel ◽  
Corrosion Electrochemical Behavior

In order to study the corrosion characteristics of 16Mn and X42 steel in natural seawater, the indoor contrast corrosion experiments are carried out in seawater by electrochemical method. Tafel polarization curves and electrochemical impedance spectroscopy (EIS) techniques are employed to investigate the corrosion electrochemical behavior of 16Mn and X42 steel, which are acquired by electrochemical workstation. The results of polarization curves and EIS reveal the respective corrosion rules of 16Mn and X42 steel in natural seawater. At last, the different influence of corrosion scale on the corrosion process of 16Mn and X42 steel is analyzed contrastively.

Research on Corrosion Characteristics of Mild Steel in Sea Water at Weihai

2012 ◽  
Vol 229-231 ◽  
pp. 31-34
Author(s):  
Yan Gang Wang ◽  
Xing Hua Tong ◽  
Yong Jiang ◽  
Yong Liu ◽  
Lin Sen Zhu
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Mild Steel ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Initial Period ◽  
Corrosion Layer ◽  
Corrosion Process ◽  
Polarization Curves ◽  
Technology Research ◽  
Electrochemical Test

The corrosion characteristics of mild steel in real sea water are investigated by electrochemical test in this paper. Polarization curves and electrochemical impedance spectroscopy (EIS) are got by electrochemical workstation. From polarization curves, it is found that the corrosion rate rises at the initial period, and it becomes the highest on the 3rd day, then drops, and it tends to be stable after about 15 days, which is confirmed by EIS. In addition, the experiments also show that the corrosion layer can suppress the corrosion process. The electrochemical corrosiveness of the mild steel is analyzed in this study, and it lays a foundation for anticorrosion technology research.

Corrosion Characteristics of 16Mn and Q235B Steel in Natural Seawater

2012 ◽  
Vol 591-593 ◽  
pp. 1046-1049
Author(s):  
Yong Liu ◽  
Xing Hua Tong ◽  
Bao Guo Li ◽  
Yan Gang Wang ◽  
Lin Sen Zhu
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Method ◽  
Electrochemical Impedance ◽  
Corrosion Process ◽  
Polarization Curves ◽  
Natural Seawater ◽  
Rust Layer ◽  
Tafel Polarization ◽  
Corrosion Electrochemical Behavior

In order to study the corrosion characteristics of 16Mn and Q235B steel in natural seawater, the indoor contrast corrosion experiments are carried out in seawater by electrochemical method. Tafel polarization curves and electrochemical impedance spectroscopy (EIS) techniques are employed to investigate the corrosion electrochemical behavior of 16Mn and Q235B steel, which are acquired by electrochemical workstation. The results of polarization curves and EIS reveal the respective corrosion rules of 16Mn and Q235B steel in natural seawater. At last, the different influence of rust layer on the corrosion process of 16Mn and Q235B steel is analyzed contrastively.

Corrosion behaviors of X70 steel under direct current interference

2019 ◽  
Vol 66 (3) ◽  
pp. 307-316 ◽  
Author(s):  
Jun Wang ◽  
Zili Li ◽  
Gan Cui ◽  
JianGuo Liu ◽  
Chuanping Kong ◽  
...  
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Soil Solution ◽  
Direct Current ◽  
Polarization Curves ◽  
Solution Ph ◽  
Corrosion Morphology ◽  
Content Type ◽  
Tafel Polarization ◽  
Corrosion Behaviors

Purpose The purpose of this paper is to study the corrosion behaviors of X70 steel under direct current (DC) interference at 0-1,200 A/m2 in simulated soil solution. Design/methodology/approach The Tafel polarization curves of X70 steel under DC interference were tested using electrochemical method, the corrosion rate was calculated using weight-loss method and the change in steel surface was analyzed by optical microscopy. Findings The results showed that E-I polarization curves under 200-1,200 A/m2 interference were linear; with an increase in the DC density, the corrosion potential of X70 steel shifted positively, solution pH after the weight-loss tests increased and corrosion rate increased linearly. A mathematical relationship between polarization resistance Rp and current density was established. Corrosion morphology indicated that pitting corrosion and crevice corrosion occurred on the X70 steel under DC interference in simulated soil solution. Originality/value All tests were conducted at a relative higher DC density (200-1,200 A/m2). The linear fitting method is proposed to fit data of Tafel polarization curves under DC interference. This study provides guidelines for safe operation of X70 steel pipelines.

scholarly journals Water Pipes Corrosion Inhibitors for Q235 Steel in Hydrochloric Acid Medium Using Spiropyrazoles Derivatives

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 167 ◽  
Author(s):  
A. M. Eldesoky ◽  
Hala. M. Hassan ◽  
Abdu Subaihi ◽  
Abeer El Shahawy ◽  
Thoraya A. Farghaly
Keyword(s):  
Distribution Systems ◽  
Corrosion Inhibitors ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Binding Mode ◽  
Outcome Data ◽  
Water Desalination ◽  
Q235 Steel ◽  
Water Pipes ◽  
Tafel Polarization

Water pipes and drinking water quality deterioration in distribution systems and sea water desalination impose the use of corrosion inhibitors. The protective effect of spiropyrazole derivatives against Q235 steel and its adsorption performance were examined in solution of 1 M HCl utilizing TP (Tafel polarization), electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS) tests. The outcome data from hindrance efficiency rise with the dose of inhibitor. The orders of %IE of spiropyrazole derivatives are given: (1) > (2) > (3).It was noted that the values of EHOMO and ELUMO dropping in order run parallel to the improvement in %IE, which support the preceding order. EIS spectra exhibited one capacitive loop and approve the protective ability. Molecular docking was utilized to get a full picture on the binding mode among spiropyrazoles derivatives and the receptor of 3tt8-hormone of crystal structure examination of Cu human insulin derivative. The morphology of protected Q235 steel was evaluated by checking electron magnifying instrument innovation with energy dispersive X-beam spectroscopy (SEM–EDX).

Effects of Different Ions on the Corrosion Behavior of SM 80SS Tubing Steel in CO2/H2S Containing Aqueous Solution

2013 ◽  
Vol 734-737 ◽  
pp. 1367-1373
Author(s):  
Guan Fa Lin ◽  
Xun Chang Dong ◽  
Shi Dong Zhu ◽  
Zhen Quan Bai
Keyword(s):  
Aqueous Solution ◽  
Weight Loss ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Electrochemical Reaction ◽  
Initial Period ◽  
Activation Reaction ◽  
Linear Polarization Resistance

As an attempt to contribute to the understanding of the corrosion processes of anti-sulfur steel in CO2and H2S containing environment with different species, the corrosion behavior of SM 80SS tubing steel immersed in CO2and H2S containing solution was analyzed in this work. To determine the corrosion behavior of SM80SS steel, the linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques were used, as well as weight loss test and surface analysis. The results showed that the presence of Cl-quickened the anodic dissolution processes and rapidly increased the corrosion rate of SM 80SS steel, and that the addition of Ca2+and Mg2+reduced corrosion rate. The corrosion processes of SM 80SS steel were controlled by the electrochemical reaction in the initial period and then converted to be controlled by electrochemical and activation reaction with increasing Cl-. Keywords: SM 80SS tubing steel; CO2/H2S corrosion; EIS; Chloride; Ca2++ Mg2+

The Influence of Seawater Velocity to the Corrosion Rate and Paint Degradation at Mild Steel Plate Immersed in Sea Water

2014 ◽  
Vol 554 ◽  
pp. 218-221 ◽  
Author(s):  
Manuhutu Ferry ◽  
W.B. Wan Nik ◽  
Che Wan Mohd Noor
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Flow Velocity ◽  
Water Flow ◽  
Steel Plate ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Flow Speed ◽  
Plate Surface ◽  
Water Flow Velocity

Mild steel is one of the materials that used to build ships and other marine construction which go through current, streams, waves with different speed. The aim of this study is to investigate the effect of seawater flow speed on the corrosion rate of mild steel and the paint thickness degradation. The simulation is done at laboratory scale using mild steel coupons exposure under different flow velocity of seawater that are 2 m/s, 4 m/s, 6 m/s and as control is used stationary flow, 0 m/s. Electrochemical impedance spectroscopy is used to determine the corrosion rate occurred on the coupons plate surface and its paint degradation as function of immersion time. Scanning electron microscopy also is used to observe the plate surface rust and the damage of paint which occurred during the experiment. Experiment is run for thirty days for every water flow speed and the data is taken every ten days. The result of this study revealed that the corrosion rate and paint degradation are increased by the increasing of water flow velocity which is proposed to validate seawater flow rate as parameter that increased the paint damage and corrosion rate of mild steel plate.

Corrosion Performance Study of Anodic Film Formed by Oxidizing Magnesium Alloy in Environmentally Friendly Electrolyte

2011 ◽  
Vol 686 ◽  
pp. 17-20 ◽  
Author(s):  
Ding Fei Zhang ◽  
Li Bo Cui ◽  
Yu Ping Liu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Electrical Circuit ◽  
Polarization Curves ◽  
Anodic Film ◽  
Equivalent Electrical Circuit ◽  
Optimum Temperature ◽  
Corrosion Performance ◽  
Performance Study ◽  
Tafel Polarization

The effect of different factors on the corrosion performance of the anodic film formed on AZ31 was studied by using electrochemical impedance spectroscopy (EIS) and Tafel polarization curves techniques. The result of EIS showed that the oxide film formed at 20 mA·cm-2had the highest corrosion resistance and the optimum temperature was 40°C. The similar conclusion was drawn by the Tafel polarization curves. Moreover, the equivalent electrical circuit R(C(R (QR))) (CR) was used to analyze the EIS data.

Accelerated Corrosion of Stainless Steels in the Presence of Molten Carbonate below 923 K

1997 ◽  
Vol 496 ◽  
Author(s):  
Ken-ichiro Ota ◽  
Katsuya Toda ◽  
Naobumi Motohira ◽  
Nobuyuki Kamiya
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Corrosion Rate ◽  
Stainless Steels ◽  
Corrosion Test ◽  
Initial Period ◽  
High Temperature Corrosion ◽  
Molten Carbonate ◽  
Reaction Conditions ◽  
Accelerated Corrosion

ABSTRACTThe high temperature corrosion of stainless steels (SUS316L and SUS310S) in the presence of molten carbonate [(Li0.62K0.8)2CO3 and (Li0.52Na0.48)2CO3] has been studied in a CO2-O2 atmosphere by measuring the weight gain of the specimens.The corrosion of SUS316L significantly depended on the reaction conditions. With the carbonate coating (both Li/Na and Li/K carbonates), severe corrosion occurred during the initial period of the corrosion test below 923 K, especially around 823 K. The initial severe corrosion was a local corrosion which produced through holes in the metal specimens and occurred more clearly at low Pco2 with the Li/Na coating than with the Li/K coating. The corrosion became more severe at higher CO2 pressures and lower O2 pressures. In a pure CO2 atmosphere (without O2), the corrosion rate significantly increased at 823 K. The steel was corroded uniformly at that time.

Effect of Sn Addition on the Corrosion Performance of Cast X-52 in H2S-Containing Environment at 60°C

2013 ◽  
Vol 743-744 ◽  
pp. 607-612 ◽  
Author(s):  
Hong Liang Lin ◽  
Jian Qiu Wang ◽  
En Hou Han
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Corrosion Performance ◽  
Positive Role ◽  
Surface Corrosion ◽  
The Matrix ◽  
The Relationship ◽  
Small Content

The electrochemical behavior of cast X-52 with different Sn content ranging from 0 to 1 wt. % was investigated using the methods of potentiodynamic test, electrochemical impedance spectroscopy (EIS). The immersion tests involved to examine the relationship between Sn addition and corrosion performance of cast X-52. In addition, the morphology and the compositions of surface corrosion products were analyzed using scanning electron microscope (SEM)/ energy dispersive spectroscopy (EDS). Potentiodynamic polarization curves showed that the presence of Sn decreased the corrosion current density. EIS indicated that Sn-containing steels had higher polarization resistances. These results confirmed that Sn played a positive role in reducing corrosion rate in H2S-containing environment. However, the corrosion resistance decreased with increasing Sn addition. It was proved that Sn improved the corrosion resistance with only a small content and large amount of Sn might lead to an advance of the pit due to occurrence of more acidification. Moreover, a continuous inner O-rich layer adherent to the matrix was found for Sn-addition samples, which lead to a decrease of corrosion rate due to its compact characteristic, compared with porous sulfide formed on the outer surface.

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