Investigation on Fe3Al Corrosion Behavior in Simulating Marine Biofilm Environment

2008 ◽  
Vol 47-50 ◽  
pp. 177-180
Author(s):  
Xue Ting Chang ◽  
Yan Sheng Yin ◽  
Tao Wang ◽  
Cheng Wei Yin ◽  
Sha Cheng ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Calcium Alginate ◽  
Chloride Solution ◽  
Sodium Sulfide ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Natural Structure ◽  
Structure And Property ◽  
Calcium Alginate Gel ◽  
Bacteria Culture

In terms with the natural structure and property of microbe film, microbe film was simulated by Calcium Alginate gel Acetic acid, manganese dioxide, sodium sulfide were added separately into sodium chloride solution to simulate different bacteria culture systems. The corrosion behavior of Fe3Al was characterized based on the analysis of open circle potential, polarization curves, and electrochemical impedance. The corrosion potential of simulating SRB was 0.6V negative-moved in comparison with that of the other two bacteria. The results indicate that Fe3Al electrodes were much easier eroded by SRB environment.

scholarly journals Influence of the Alkaline Reserve of Chloride-Contaminated Mortars on the 6-Year Corrosion Behavior of Corrugated UNS S32304 and S32001 Stainless Steels

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 686 ◽  
Author(s):  
Asunción Bautista ◽  
Francisco Velasco ◽  
Manuel Torres-Carrasco
Keyword(s):  
Corrosion Behavior ◽  
Stainless Steels ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Duplex Microstructure ◽  
Testing Period ◽  
Alkaline Reserve ◽  
Eis Measurements ◽  
High Chloride ◽  
Chloride Concentrations

The durability of two lean corrugated duplex stainless steel (UNS S32304 and S32001) bars manufactured for concrete reinforcement was studied in four different corrosive conditions. These duplex stainless steels are more economical than the most traditional, well-known duplex grade steels (UNS S32205). The research was carried out in mortar samples for six years. In half of the samples, the alkaline reserve had been previously decreased, and their pH was slightly below 12, while in the other half, the pH close to the bars remained as-manufactured. Moreover, there were samples with modified and non-modified alkaline reserve where chlorides had been previously added to the mortar which were exposed to high relative humidity. In other samples—which were partially immersed in 3.5% NaCl—the chlorides entered through the mortar by natural diffusion. The electrochemical behavior of the reinforcements in these conditions was periodically monitored through corrosion potential (Ecorr) and electrochemical impedance spectroscopy (EIS) measurements during the whole testing period. The samples were anodically polarized at the end of the exposure. The results prove that the decrease in the alkaline reserve of the mortars can affect the corrosion behavior of the studied lean duplex in environments with high chloride concentrations. The duplex microstructure of the reinforcements makes it so that the corrosion proceeds by selective attack of the phases.

Electrodeposition of Salicylideneaniline and its Corrosion Behavior

2012 ◽  
Vol 554-556 ◽  
pp. 385-389
Author(s):  
Zailelah Zainoldin ◽  
Mohamad Kamal Harun ◽  
Hadariah Bahron ◽  
Karimah Kassim
Keyword(s):  
Mild Steel ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Steel Surface ◽  
Sodium Chloride Solution ◽  
Electrochemical Impedance ◽  
Sodium Hydroxide Solution ◽  
Distilled Water ◽  
Nacl Solution ◽  
Mild Steel Surface

Electrodeposition was carried out on mild steel surface in 0.3 M sodium hydroxide solution (70% distilled water: 30% ethanol) containing 0.1 M salicylideneaniline using cyclic voltammetry and chronoamperometry techniques. Both techniques show the formation of the films on the mild steel surface. The corrosion behavior of electrodeposited mild steel was studied using electrochemical impedance spectroscopy (EIS) technique at various immersion times in 0.5 M sodium chloride solution (NaCl). The study indicates that the resistance of mild steel against corrosion increases after being electrodeposited with salicylideneaniline. However the films tend to diminished after 24 hours being immersed in 0.5 M NaCl solution.

scholarly journals Corrosion Behavior of CoCrFeNiTax Alloys in 1 M Sodium Chloride Aqueous Solution

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5157
Author(s):  
Chun-Huei Tsau ◽  
Rong-Wei Hsiao ◽  
Tien-Yu Chien
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Sodium Chloride ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Electrochemical Impedance ◽  
Eutectic Structure ◽  
Different Temperatures

This paper investigates the effects of Ta content on the microstructures, hardness and corrosion behavior of as-cast CoCrFeNiTax alloys. The results indicate that the addition of Ta can change the microstructures of these alloys to dual-phased structures (FCC + HCP), as well as increasing their hardness. This study uses constant galvanostatic/potentiometric methods to measure the polarization curves of CoCrFeNiTa0.1, CoCrFeNiTa0.3 and CoCrFeNiTa0.5 alloys in deaerated 1 M sodium chloride solution at different temperatures. Electrochemical impedance spectroscopy is also used to analyze these alloys in sodium chloride solution. The results indicate that the CoCrFeNiTa0.5 alloy has a eutectic structure and the highest hardness. Furthermore, although the CoCrFeNiTa0.5 alloy has the best corrosion resistance, the CoCrFeNiTa0.3 alloy has the best pitting resistance among these alloys.

Effect of Sulfate Ions on the Corrosion Behavior of Steel in Concrete Using Electrochemical Methods

2010 ◽  
Vol 163-167 ◽  
pp. 3049-3054 ◽  
Author(s):  
Jin Jie Shi ◽  
Wei Sun
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Chloride Solution ◽  
High Performance ◽  
High Performance Concrete ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Sulfate Solution ◽  
Cyclic Polarization ◽  
Sulfate Ions

The effect of sulfate ions on the corrosion behavior of steel in ordinary Portland concrete (OPC) and high performance concrete (HPC) were investigated. Steel corrosion was evaluated by means of corrosion potential (Ecorr), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP). The electrochemical results indicated that, compared to the pure chloride solution, the presence of sulfate ions in the chloride solution both reduced the time to corrosion initiation and lead to an increase in corrosion rate of steel in OPC specimens; however, the sulfate ions had negligible effect in HPC specimens. Furthermore, the corrosion rate of steel exposed to chloride solution was higher that to the sulfate solution both in OPC and HPC specimens.

Study on the Corrosion Behavior of Two Kinds of Tubing at Different Temperatures

2011 ◽  
Vol 314-316 ◽  
pp. 1335-1341
Author(s):  
Xue Hui Zhao ◽  
Yan Han ◽  
Fa Gen Li ◽  
Zhen Quan Bai ◽  
Bin Wei
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Xrd Analysis ◽  
Tafel Polarization ◽  
Corrosion Rates ◽  
Two Samples ◽  
Different Temperatures

Aimed at the problem of sulfur-resistant corrosion in environment with carbon dioxide(CO2)and trace amounts of hydrogen sulfide (H2S), Tafel polarization curves and electrochemical impedance spectroscopy techniques were employed to study the electrochemistry corrosion behavior of two kinds of 80S(A and B) at different temperatures. The methods of weight-loss，scanning electron microscope and X-ray diffraction (XRD) analysis were used to study on the corrosion behavior of the sulfur-resistant tubes, including electrochemical impedance spectroscopy , average corrosion rates and the corrosion morphologies. The results showed that the corrosion potential and corrosion rates (CR) of two samples were different with the changing of the test temperatures. With the increase of the temperature, the corrosion potential decreased, and the corrosion rates increased, but decreased at 120°C. The corrosion-resistant of A80S was slightly superior to the B80S. The serious pitting corrosion and the maximum average CR occurred at 90°C. The XRD analysis suggested that the main corrosion products were FeS.

Electrochemical corrosion study of Pb-free solders

2006 ◽  
Vol 21 (1) ◽  
pp. 62-70 ◽  
Author(s):  
B.Y. Wu ◽  
Y.C. Chan ◽  
M.O. Alam ◽  
W. Jillek
Keyword(s):  
Acid Solution ◽  
Corrosion Behavior ◽  
Current Density ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Corrosion Properties ◽  
Linear Polarization Resistance ◽  
Eis Measurements

This paper presents an investigation on the corrosion behavior of five solders by means of polarization and electrochemical impedance spectroscopy (EIS) measurements. The Sn–9Zn and Sn–8Zn–3Bi solder, in comparison with the Sn–3.5Ag–0.5Cu and Sn–3.5Ag–0.5Cu–9In solder, were tested in 3.5 wt% NaCl solution and 0.1 wt% adipic acid solution, respectively. The Sn–37Pb solder was for reference in this work. The polarization curves indicated that the Sn–9Zn and Sn–8Zn–3Bi solder showed the worst corrosion resistance both in the salt and acid solutions, in terms of corrosion-current density, corrosion potential, linear polarization resistance, and passivation-current density. Meanwhile, the Sn–3.5Ag–0.5Cu solder remained the best corrosion characteristics in both solutions. It was found that due to microstructure alteration, Bi additive to the Sn–9Zn solder improved the corrosion behavior in the salt solution, whereas decreased that in the acid solution. However, the additive of In degraded the Sn–3.5Ag–0.5Cu solder in both solutions. The EIS results agreed well with the noble sequence of the five solders subjected to the two solutions with polarization. The equivalent circuits were also determined. Nevertheless, the four Pb-free solders exhibited acceptable corrosion properties since there was not much difference of key corrosion parameters between them and the Sn–37Pb solder.

Influence of sulfate reducing bacteria on the cupronickel corrosion

2014 ◽  
Vol 61 (6) ◽  
pp. 395-401
Author(s):  
Liu Kecheng ◽  
Liu Xia ◽  
Long Xiao ◽  
Wei Jiaqiang ◽  
Hu Mengsha ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Sulfate Reducing Bacteria ◽  
Free Corrosion Potential ◽  
Content Type ◽  
Linear Polarization Resistance ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Purpose – The purpose of this study is to explore the influence of the sulfate reducing bacteria (SRB) on the corrosion of cupronickel. Design/methodology/approach – Tests monitoring the change in free corrosion potential, linear polarization resistance and electrochemical impedance spectroscopy and examination using the scanning electron microscope and energy spectrum analysis were used to investigate the corrosion behavior of cupronickel in blank medium and in media inoculated with SRB to explore the influence of the SRB on the corrosion behavior of cupronickel alloy. Findings – The results show that SRB can destroy the surface oxide film of cupronickel and significantly reduce the free corrosion potential and polarization resistance of the cupronickel, causing the cupronickel to corrode significantly. Originality/value – SRB are widely found in the water supply system and is one of the important factors inducing microbial corrosion. This paper verified that SRB promote cupronickel corrosion and explored the influence and mechanism of attack.

COMPARATIVE STUDY OF CORROSION BEHAVIOR FOR PLASMA NITRIDED 1045 CARBON STEEL WITH AND WITHOUT PRETREATMENT OF SAND BLASTING

2018 ◽  
Vol 25 (01) ◽  
pp. 1850036 ◽  
Author(s):  
SHIJING LU ◽  
XIAOBING ZHAO ◽  
BIN MIAO ◽  
LU SONG ◽  
KUNXIA WEI ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Behavior ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Plasma Nitriding ◽  
Corrosion Current ◽  
Compound Layer ◽  
Frequency Region ◽  
Sand Blasting ◽  
Soaking Test

A pretreatment of sand blasting with the duration of 15[Formula: see text]min was carried out prior to plasma nitriding for 1045 carbon steel in this study. The corrosion behavior was evaluated by means of electrochemical polarization, electrochemical impedance spectroscopy (EIS) and soaking test, and compared with that without pretreatment of sand blasting. The results show that the pretreatment of sand blasting can significantly enhance the corrosion resistance, the corrosion potential shift to the noble direction, with higher corrosion potential of [Formula: see text][Formula: see text]mV and lower corrosion current of 0.0853[Formula: see text][Formula: see text]A/cm2, and exhibit larger diameter, higher phase angle and wider frequency region, there exists no corrosion pit after soaking test, and the corrosion rate is decreased from 0.0387[Formula: see text]g/mm2 to 0.01341[Formula: see text]g/mm2, only 1/3 comparing with that of sample without pretreatment of sand blasting. The enhancement mechanism of corrosion behavior is mainly ascribed to the excellent protection from the thicker and denser compound layer with higher amount of [Formula: see text]-Fe[Formula: see text]N.

scholarly journals Effect of Conducting Polyaniline/Graphene Nanosheet Content on the Corrosion Behavior of Zinc-Rich Epoxy Primers in 3.5% NaCl Solution

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 850 ◽  
Author(s):  
Yanhua Lei ◽  
Zhichao Qiu ◽  
Jiurong Liu ◽  
Dongdong Li ◽  
Ning Tan ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Corrosion Potential ◽  
Potential Versus ◽  
Electrochemical Impedance ◽  
Graphene Nanosheet ◽  
Protective Properties ◽  
Free Corrosion Potential ◽  
Conducting Polyaniline ◽  
Sacrificial Cathodic Protection

The corrosion behavior of zinc-rich epoxy primers or paints (ZRPs) with different conducting polyaniline-grafted graphene (PANI/Gr) contents was investigated. Conductivity of the formed PANI/Gr nanosheets was significantly improved by employing the Gr as the inner template to synthesize the PANI. The protective properties and electrochemical behavior of coatings with artificial defects were investigated by monitoring the free corrosion potential versus time and by using localized electrochemical impedance spectroscopy (LEIS). A synergetic enhancement of the physical barrier role of the coating and the zinc sacrificial cathodic protection was achieved in the case of ZRP including PANI/Gr nanosheets. In addition, the ZRP mixed with the PANI/Gr at a content of 0.6% exhibited the best anticorrosion performance across the range of investigated PANI/Gr contents.

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