Effect of lanthanum nitrate on the microstructure and electrochemical behavior of PEO coatings on AZ31 Mg alloy

Toorani, M.; Mahmood, Asif; Golabadi, M.; Rouhaghdam, A. Sabour

doi:10.1016/j.jallcom.2017.05.169

Cited by 76 publications

(27 citation statements)

References 55 publications

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“…After dipping the zinc sample into a 3% NaCl solution, the spectrum showed a capacitive loop in the high and mid frequencies range and an inductive loop in the low frequency range (Figure A). The inductive response is usually associated with the active anodic dissolution of zinc, which in this case may occur after the dissolution of the formed passive films on the initial surface …”

Section: Resultsmentioning

confidence: 99%

Properties of zinc coatings electrochemically passivated in sodium molybdate

Акулич

Ivanova

Zharskii

et al. 2018

Surface & Interface Analysis

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Molybdenum compounds are considered to be promising, environmentally friendly substances for passivation of zinc coatings. Conversion coatings on electroplated zinc coatings obtained by cathodic polarization of a solution of molybdate of sodium with the addition of phosphoric acid are studied. These coatings had a pronounced needle-shaped structure and were homogeneous. X-ray photoelectronic spectroscopy analysis showed that zinc hydroxides and phosphates, Mo (VI), and Mo (V) compounds are present in the conversion coating. As part of this study, the influence of the current density and deposition time of the coating on the surface morphology and the chemical composition of conversion films was determined. Polarization measurements and electrochemical impedance spectroscopy have shown that the investigated coatings significantly increase the corrosion resistance of galvanized steel in chloridecontaining solution.

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Section: Resultsmentioning

confidence: 99%

Properties of zinc coatings electrochemically passivated in sodium molybdate

Акулич

Ivanova

Zharskii

et al. 2018

Surface & Interface Analysis

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“…On the other hand, La coatings in the aqueous medium can also be dissolved, which propitiate an alkaline environment that leads to the precipitation of lanthanum hydroxides [ 81 , 82 ]:

…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Sputtered Ce/La, La/Ce Oxide Bilayers on AA6061 and AA7075 Aluminum Alloys for the Development of Corrosion Protective Coatings

et al. 2018

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This work provides a comparative study on the corrosion protection efficiency of Ce, La films as well as Ce/La and La/Ce oxide bilayered coatings deposited onto AA7075 and AA6061 substrates by the radio frequency (RF) magnetron sputtering technique. The coating thickness ranged approximately from 12 to 835 nm, which changed with the deposition parameters and substrate composition. The relationship between microstructure, roughness and electrochemical performance is examined. The reactivity and crystallinity of rare earth (RE) films can be tailored by adjusting the sputtering parameters. Sputtered La films with thickness ca. 390 nm and average roughness of 66 nm showed the best corrosion protection properties in chloride medium as determined by potentiodynamic curves and electrochemical impedance spectroscopy (EIS). The method to obtain RE bilayered coatings, i.e., La/Ce or Ce/La as well as the substrate composition and applied power conditioned their inhibition properties. The RE bilayered coatings displayed better barrier properties than Ce films, which were poorer than those featured by La films.

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“…PEO is an environmental-friendly surface modification technique as alkaline electrolytes are used. The PEO process has many advantages compared to the conventional anodizing method [7][8][9][10]. Polymer coatings, especially the polytetrafluoroethylene, cannot be applied directly to the alloy because of lack of adhesion; surface pretreatment is required.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric and Marine Corrosion of PEO and Composite Coatings Obtained on Al-Cu-Mg Aluminum Alloy

et al. 2020

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Wrought Al-Cu-Mg aluminum alloy (D16) was treated by bipolar plasma electrolytic oxidation to create a base plasma electrolytic oxidation (PEO)-coating with corrosion protection and mechanical properties superior to bare alloy’s natural oxide layer. Additional protection was provided by the application of polymer, thus creating a composite coating. Electrochemical and scratch tests, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction studies were performed. Degradation of coatings in the marine atmosphere and seawater was evaluated. The composite polymer-containing coating provided better corrosion protection of aluminum alloy compared to the PEO-coating, although seawater affected both. During the atmospheric exposure, the PEO-coating provided reasonably good protection, and the composite coating showed excellent performance.

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Effect of lanthanum nitrate on the microstructure and electrochemical behavior of PEO coatings on AZ31 Mg alloy

Cited by 76 publications

References 55 publications

Properties of zinc coatings electrochemically passivated in sodium molybdate

Properties of zinc coatings electrochemically passivated in sodium molybdate

Fabrication of Sputtered Ce/La, La/Ce Oxide Bilayers on AA6061 and AA7075 Aluminum Alloys for the Development of Corrosion Protective Coatings

Atmospheric and Marine Corrosion of PEO and Composite Coatings Obtained on Al-Cu-Mg Aluminum Alloy

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