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Formation of a cerium conversion coating on magnesium alloy using ascorbic acid as *** and anticorrosive properties of the formed films

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Journal of Magnesium and Alloys 2016年第4期4卷 278-285页

作者： A.P.Loperena I.L.Lehr S.B.Saidman Instituto de Ingeniería Electroquímica y Corrosión(INIEC) Departamento de Ingeniería QuímicaUniversidad Nacional del SurAv.Alem 12538000 Bahía BlancaArgentina

Cerium-based conversion coatings were formed on AZ91D magnesium alloy by immersion of the substrate in solutions containing Ce(NO_(3))_(3),H_(2)O_(2) and ascorbic acid(HAsc).The characterisation of the films was performed by electrochemical and surface analysis techniques such as SEM,EDS,X-ray diffraction and X-ray photoelectron spectroscopy(XPS).The degree of corrosion protection achieved was evaluated in simulated physiological solution by the open circuit potential monitoring,polarisation techniques and electrochemical impedance spectroscopy(EIS).The presence of HAsc in the conversion solution causes changes in the morphology,adherence and anticorrosive performance of the *** improvement in the corrosion resistance is closely associated with the corrosion inhibition properties of HAsc.

关键词： Cerium coatings AZ91D alloy Ascorbic acid anticorrosive properties

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Correlations Between Chemical State,Dispersion State,and anticorrosive properties of Graphene Reinforced Waterborne Polyurethane Composite Coatings

Correlations Between Chemical State,Dispersion State,and Ant...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Li Jing Li Yaya Yang Zhenzhen Yang Junhe School of Materials Science and Engineering University of Shanghai for Science and Technology

Grapheneoxide(GO) / functionalized graphene(FG) / graphene oxide after mild reduction(RGO) reinforced waterborne polyurethane(PU) composite coatings were fabricated on galvanizedsteel *** anticorrosive properties of the graphene reinforced PU composite coating were characterized. The dispersion state of graphene in PU matrix varied with the tailored chemical state of graphene. The correlations between the chemical state, dispersion state of graphene, and anticorrosive properties of the composite coatings were discussed. The superior anticorrosive properties of the graphene reinforced PU composite coatings were achieved by the addition of 0.2 wt% of RGO. The Electrochemical Impedance Spectroscopy(EIS) results showed that the under-painting corrosion didn’t occur after 235 h immersion in 3.5 wt% NaC l electrolyte and the impedance modulus at 0.1Hz remained at 10 ?, barely changed for 235 *** GO reinforced PU composite coatingsshowed similar anticorrosive properties. The FG reinforced PUcomposite coatings exhibited a conductive percolation threshold of 0.1 wt%, while their anticorrosive properties remained fairly high.

关键词： anticorrosive properties graphene composite coatings

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Corrosion protection of AZ91D magnesium alloy by a cerium-molybdenum coating-The effect of citric acid as an additive

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Journal of Magnesium and Alloys 2018年第4期6卷 356-365页

作者： I.L.Lehr S.B.Saidman Instituto de Ingeniería Electroquímica y Corrosión(INIEC) Departamento de Ingeniería QuímicaUniversidad Nacional del Sur(UNS)CONICETBahía BlancaArgentina

In order to improve the corrosion resistance of AZ91D magnesium alloy,a coating was formed by a potentiostatic technique from a solutions containing Ce(NO_(3))_(3),Na_(2)MoO_(4)and citric acid(H_(3)Cit).The degree of corrosion protection achieved was evaluated in simulated physiological solution by monitoring the open circuit potential,polarization techniques and electrochemical impedance spectroscopy(EIS).Surface analysis techniques(SEM,EDS,X-ray diffraction and X-ray photoelectron spectroscopy(XPS))were used for coating *** film is mainly composed by cerium and molybdenum oxides and magnesium oxides and *** obtained results show that the corrosion resistance of the coated electrodes has been increased *** improvement in the anticorrosive performance is in part due to the corrosion inhibition properties of H_(3)Cit.

关键词： Cerium and molybdenum-based coatings AZ91D alloy Citric acid anticorrosive properties

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