Identification of steel corrosion in alkaline sulfate solution by electrochemical noise

Purpose The purpose of this study is to analyze the corrosion behavior of 304SS in three kinds of solution, 3.5 per cent NaCl, 5 per cent H2SO4 and 1 M (1 mol/L) NaOH, using electrochemical noise. Design/methodology/approach Corrosion types and rates were characterized by spectrum and time-domain analysis. EN signals were evaluated using a novel method of phase space reconstruction and chaos theory. To evaluate the chaotic characteristics of corrosion systems, the delay time was obtained by the mutual information method and the embedding dimension was obtained by the average false neighbors method. Findings The varying degrees of chaos in the corrosion systems were indicated by positive largest Lyapunov exponents of the electrochemical potential noise. Originality/value The change of correlation dimension in three kinds of solution demonstrated significant differences, clearly differentiating various types of corrosion.

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Microbial consortium influence upon steel corrosion rate, using polarisation resistance and electrochemical noise techniques

Electrochimica Acta ◽

10.1016/j.electacta.2004.03.038 ◽

2004 ◽

Vol 49 (25) ◽

pp. 4295-4301 ◽

Cited By ~ 46

Author(s):

M.J Hernández Gayosso ◽

G Zavala Olivares ◽

N Ruiz Ordaz ◽

C Juárez Ramirez ◽

R Garcı́a Esquivel ◽

...

Keyword(s):

Corrosion Rate ◽

Microbial Consortium ◽

Electrochemical Noise ◽

Steel Corrosion ◽

Polarisation Resistance

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.3049 ◽

2010 ◽

Vol 163-167 ◽

pp. 3049-3054 ◽

Cited By ~ 1

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.

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Research on the Corrosive Factors of Q235 Steel in Simulate Ammonium Sulfate Solution of Ammonia Desulphurization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.941-944.165 ◽

2014 ◽

Vol 941-944 ◽

pp. 165-168

Author(s):

Lian He ◽

Dong Sheng Chen ◽

Fei Fei Lou ◽

Qin Qin Ye ◽

Wu Ji Wei ◽

...

Keyword(s):

Corrosion Rate ◽

Flow Velocity ◽

Ammonium Sulfate ◽

Steel Corrosion ◽

Sulfate Solution ◽

Ammonium Sulfate Solution ◽

Q235 Steel ◽

Electrode Processes ◽

Maximum Value ◽

Weight Loss Method

Corrosion behaviors of Q235 steel in simulate ammonium sulfate solution were studied. Effects of the ammonium sulfate concentration, Cl- concentration, pH and the flow velocity on corrosion of Q235 steel in simulate ammonium sulfate solution were investigated by the weight-loss method, and the electrode processes were studied by polarization curves. The result showed that: (1) the corrosion rate of Q235 steel increased with the increase of Cl- concentration firstly. When Cl- concentration was 10000ppm, the corrosion rate reached the maximum value of 6.698 mm/a, and then, with the increase of Cl- concentration, the corrosion rate decreased. (2)With pH increasing, the corrosion rate of Q235 steel decreased. (3)The corrosion rate increased with the increase of the concentration of ammonium sulfate firstly. When the concentration of ammonium sulfate was 5%, the corrosion rate reached the maximum value of 5.462 mm/a. And then the corrosion rate decreased. (4)The influence of the flow velocity on Q235 steel corrosion was remarkable, with the increase of the flow velocity, the corrosion rate increased rapidly.

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