Influence of concentrations of chloride ions on electrochemical corrosion behavior of titanium-zirconium-molybdenum alloy

The two Cu60Ni20Cr20alloys with the different grain size were prepared by conventional casting (CA) and mechanical alloying (MA) through hot pressing. Effect of the grain size on electrochemical corrosion behavior of the two Cu60Ni20Cr20 alloys was also studied in solutions containing chloride ions. Results show that the free corrosion potentials of the two alloys move toward to negative values, corrosion current densities increase and therefore corrosion rates become faster with the increment of chloride ion concentrations. CACu60Ni20Cr20alloy and MACu60Ni20Cr20alloy have passive phenomena in 0.05mol/L Na2SO4 neutral solution, but passive phenomena become weak or disappear when the chloride ions are added. Corrosion rates of the nanocrystalline MACu60Ni20Cr20alloy become slower than those of the coarse grained CACu60Ni20Cr20alloy in solutions containing the same chloride ion concentrations because MACu60Ni20Cr20alloy is able to produce large concentrations of grain boundaries and passive elements is able to diffuse quickly to form the protective film.

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Comparative Study on Electrochemical Corrosion Behavior of B500SD Carbon Steel and 2205 Duplex Stainless Steel Exposed to Concrete Pore Solution Containing Chloride Ions

International Journal of Electrochemical Science ◽

10.20964/2021.07.54 ◽

2021 ◽

pp. ArticleID:210720

Author(s):

Weiling Teng ◽

Keyword(s):

Stainless Steel ◽

Carbon Steel ◽

Comparative Study ◽

Duplex Stainless Steel ◽

Corrosion Behavior ◽

Pore Solution ◽

Electrochemical Corrosion ◽

Chloride Ions ◽

2205 Duplex Stainless Steel ◽

Electrochemical Corrosion Behavior

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Electrochemical corrosion behavior of Cu-40Ni-20Cr alloys with different grain sizes in solutions containing chloride ions

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(07)60255-6 ◽

2007 ◽

Vol 17 (6) ◽

pp. 1236-1241 ◽

Cited By ~ 5

Author(s):

Zhong-qiu CAO ◽

Jing BIAN ◽

Rong XUE ◽

Wei-hua LIU

Keyword(s):

Corrosion Behavior ◽

Electrochemical Corrosion ◽

Chloride Ions ◽

Grain Sizes ◽

Electrochemical Corrosion Behavior

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Influence of Chloride Ions on Electrochemical Corrosion Behavior of Dual-Phase Steel over Conventional Rebar in Pore Solution

Applied Sciences ◽

10.3390/app10134568 ◽

2020 ◽

Vol 10 (13) ◽

pp. 4568

Author(s):

Hany S. Abdo ◽

Asiful H. Seikh ◽

Jabair A. Mohammed ◽

Monis Luqman ◽

Sameh A. Ragab ◽

...

Keyword(s):

Corrosion Resistance ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Pore Solution ◽

Electrochemical Corrosion ◽

Chloride Ions ◽

Dual Phase ◽

Good Corrosion Resistance ◽

Main Challenge ◽

Electrochemical Corrosion Behavior

Reinforced steel bars (rebar) are extensively used in construction, and the main challenge is in minimizing corrosion due to oxide or passive layer breakdown. In contrast, dual-phase (DP) steel has good corrosion resistance. This study investigated the effect of Cl− ions on the electrochemical corrosion behavior of DP rebar and conventional rebar. Corrosion behavior studies and electrochemical measurements were conducted on DP rebar and conventional rebar in simulated concrete pore solution with different concentrations of Cl− ions. Microstructure analysis, surface morphology analysis, and corroded surface characterization were performed using optical microscopy, field emission scanning electron microscopy, and Raman spectroscopy, respectively. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed that DP rebar has good passivity, leading to better corrosion resistance and greater strength compared to ordinary rebar. In addition, DP rebar showed better passivity behavior compared to conventional rebar in alkaline solution. Therefore, the presence of a dual phase (ferrite and martensite) in reinforced concrete structured steel induces good corrosion resistance.

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Electrochemical Corrosion Behavior of Cu-20Fe-12Cr Alloys with the Different Grain Size in Solutions Containing Chloride Ions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.655 ◽

2011 ◽

Vol 399-401 ◽

pp. 655-661

Author(s):

Zhong Qiu Cao ◽

Rong Xue ◽

Jing Bian ◽

Ya Jun Fu

Keyword(s):

Grain Size ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Electrochemical Corrosion ◽

Chloride Ion ◽

Chloride Ions ◽

Ion Concentrations ◽

Corrosion Rates ◽

Electrochemical Corrosion Behavior ◽

Different Grain Size

Electrochemical corrosion behavior of Cu-20Fe-12Cr alloys prepared by powder metallurgy (PM) and mechanical alloy (MA) with the different grain size was studied in solutions containing chloride ions. The free corrosion potentials move toward negative values and corrosion rates become faster with the increase of chloride ion concentrations for two alloys. Electrochemical impedance spectroscopy (EIS) plots of PMCu-20Fe-12Cr alloy are composed of a capacitive loop and a diffusion tail. Corrosion processes are controlled by diffusion. EIS plots of MACu-20Fe-12Cr alloy in Na2SO4 or 0.02mol.L-1NaCl solution are unable to have characteristics of Warburg impedance. Corrosion processes are controlled by electrochemical reactions. After chloride ion concentrations increase up to 0.05mol.L-1, their EIS plots are composed of double capacitive loops with a straight line induced Warburg resistance between two capacitive loops. The above EIS plots imply the existence of pitting corrosion. The corrosion rates of MACu-20Fe-12Cr alloy become faster than those of PMCu-20Fe-12Cr alloy because the reduction in the grain size of MACu-20Fe-12Cr alloy produces large concentrations of grain boundaries.

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