© Corrosion Properties Of HVOF-Coated Steel In Simulated Concrete Pore Electrolyte And Concentrated...
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© Corrosion Properties Of HVOF-Coated Steel In Simulated Concrete Pore Electrolyte And Concentrated Chloride Environments Khaled, MM; Yibas, BS ELSEVIER SCIENCE SA, SURFACE COATINGS TECHNOLOGY; pp: 433-438; Vol: 202 King Fahd University of Petroleum & Minerals http://www.kfupm.edu.sa Summary orrosion susceptibility of steel and HVOF-coated steel in solutions simulatin alkaline concrete pore environment and with the addition of chloride tigated using potentiodynamic polarization and potential step techniques. The ce characterization was performed using SEM and the surface elemental analysi etermined by EDS. The concentration of chloride was 2.8 M to simulate the ntration of chloride spread in many local regions of Saudi Arabia and called a. It was found that, in the case of the simulated concrete pore electrolytes coating resulted in an anodic shift of the corrosion potential with marginal t on the corrosion current. However, upon addition of 2.8 M chloride solution orrosion rate of the HVOF-coated steel was found to increase by a factor of t howed a network of pores within the coating which provides a path for the rolyte. This would result in preferential corrosion around splat boundaries a rmed by EDS which showed that the corroded splats have higher oxide contents. tial step experiments at 400 mV above open circuit potential showed essed current of the HVOF-coated steel compared to the steel substrate alone. corrosion potential versus time experiments resulted in a more anodic decreased with time and became equal to the Ecorr of the bare steel after 34 that, the corrosion potential of the HVOF-coated steel decreased due to the ase in galvanic coupling between the steel and the HVOF coating. (c) 2007 ier B.V. All rights reserved. Copyright: King Fahd University of Petroleum & Minerals; http://www.kfupm.edu.sa
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Transcript of © Corrosion Properties Of HVOF-Coated Steel In Simulated Concrete Pore Electrolyte And Concentrated...
©
Corrosion Properties Of HVOF-Coated Steel In Simulated
Concrete Pore
Electrolyte And Concentrated Chloride Environments
Khaled, MM; Yibas, BS
ELSEVIER SCIENCE SA, SURFACE COATINGS TECHNOLOGY; pp: 433-438; Vol: 202
King Fahd University of Petroleum & Minerals
http://www.kfupm.edu.sa
Summary
The corrosion susceptibility of steel and HVOF-coated steel in solutions simulating
the alkaline concrete pore environment and with the addition of chloride was
investigated using potentiodynamic polarization and potential step techniques. The
surface characterization was performed using SEM and the surface elemental analysis
was determined by EDS. The concentration of chloride was 2.8 M to simulate the
concentration of chloride spread in many local regions of Saudi Arabia and called
Sabkha. It was found that, in the case of the simulated concrete pore electrolytes, the
HVOF coating resulted in an anodic shift of the corrosion potential with marginal
effect on the corrosion current. However, upon addition of 2.8 M chloride solution,
the corrosion rate of the HVOF-coated steel was found to increase by a factor of two.
SEM showed a network of pores within the coating which provides a path for the
electrolyte. This would result in preferential corrosion around splat boundaries and
confirmed by EDS which showed that the corroded splats have higher oxide contents.
Potential step experiments at 400 mV above open circuit potential showed a
suppressed current of the HVOF-coated steel compared to the steel substrate alone.
The corrosion potential versus time experiments resulted in a more anodic Ecorr
which decreased with time and became equal to the Ecorr of the bare steel after 34 h.
After that, the corrosion potential of the HVOF-coated steel decreased due to the
increase in galvanic coupling between the steel and the HVOF coating. (c) 2007
Elsevier B.V. All rights reserved.
Copyright: King Fahd University of Petroleum & Minerals;http://www.kfupm.edu.sa
1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.
©
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Copyright: King Fahd University of Petroleum & Minerals;http://www.kfupm.edu.sa
44.45.
©
WANG Y, 2004, SURF COAT TECH, V183, P18, DOI10.1016/j.surfcoat.2003.08.080
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