Electrochemical corrosion behavior of cast Mg–Al–RE–Mn Alloys in NaCl solution

Adding TiC particles into iron aluminide coatings has been found to improve its wear resistance, but its corrosion behavior is less known. In this study, the corrosion behavior of Fe3Al/TiC and Fe3Al-Cr/TiC composite coatings, prepared by high velocity oxy fuel (HVOF) spraying, was studied in 3.5 wt. % NaCl solution by means of electrochemical techniques and surface analysis. Results revealed that adding TiC particles into Fe3Al matrix to improve the wear resistance does not deteriorate the corrosion behavior of Fe3Al coating. It was also showed that addition of chromium to Fe3Al/TiC composite provides a more protective layer.

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Electrochemical Corrosion Behavior of Ni-Fe-Co-P Alloy Coating Containing Nano-CeO2 Particles in NaCl Solution

Materials ◽

10.3390/ma12162614 ◽

2019 ◽

Vol 12 (16) ◽

pp. 2614 ◽

Cited By ~ 4

Author(s):

Xiuqing Fu ◽

Wenke Ma ◽

Shuanglu Duan ◽

Qingqing Wang ◽

Jinran Lin

Keyword(s):

Composite Coating ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Electrochemical Corrosion ◽

Alloy Coating ◽

Charge Transfer Resistance ◽

Corrosion Mechanism ◽

Nacl Solution ◽

Transfer Resistance ◽

Electrochemical Corrosion Behavior

In order to study the effect of nano-CeO2 particles doping on the electrochemical corrosion behavior of pure Ni-Fe-Co-P alloy coating, Ni-Fe-Co-P-CeO2 composite coating is prepared on the surface of 45 steel by scanning electrodeposition. The morphology, composition, and phase structure of the composite coating are analyzed by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion behavior of the coatings with different concentrations of nano-CeO2 particles in 50 g/L NaCl solution is studied by Tafel polarization curve and electrochemical impedance spectroscopy. The corrosion mechanism is discussed. The experimental results show that the obtained Ni-Fe-Co-P-CeO2 composite coating is amorphous, and the addition of nano-CeO2 particles increases the mass fraction of P. With the increase of the concentration of nano-CeO2 particles in the plating solution, the surface flatness of the coating increases. The surface of Ni-Fe-Co-P-1 g/L CeO2 composite coating is uniform and dense, and its self-corrosion potential is the most positive; the corrosion current and corrosion rate are the smallest, and the charge transfer resistance is the largest, showing the best corrosion resistance.

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Electrochemical Corrosion Behavior of Cu15Ni10Mn Alloy in NaCl Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.341-342.23 ◽

2013 ◽

Vol 341-342 ◽

pp. 23-27

Author(s):

Wei Cai ◽

An Yun Li ◽

Pian Xu ◽

Yu Wu ◽

Liang Chen ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Corrosion Product ◽

Corrosion Behavior ◽

Electrochemical Impedance ◽

Copper Chloride ◽

Electrochemical Corrosion ◽

Corrosion Products ◽

Dissolution Mechanism ◽

Nacl Solution ◽

Electrochemical Corrosion Behavior

Investigating the electrochemical corrosion behavior of Cu15Ni10Mn alloy in NaCl solution with different Cl concentration was studied by measuring open-circuit potential, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. The results show that as the Cl- concentration increase, the corrosion potentials of the alloy shifted negatively, corrosion currents increase, the corrosion process by electrochemical control change of diffusion control, and therefore the corrosion rates become faster. The presence of Cl- have effect on the dissolution mechanism and corrosion products of the alloy, when the concentration of Cl- is relatively low, a reducing peak current appears in the process of cyclic voltammetry retracing , when the Cl- concentration is higher, cyclic voltammetry flyback process does not appear to restore the current peak. This is mainly associated with the generation of corrosion product, when Cl- concentration is low, the corrosion product is Cu2(OH)3Cl (basic copper chloride) and other two copper ion salts, when the concentration of Cl-is higher, corrosion products are mainly Cu2(OH)3Cl (basic copper chloride).

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