Studies on influence of zinc immersion and fluoride on nickel electroplating on magnesium alloy AZ91D

Zhang, Ziping; Yu, Gang; Ouyang, Yongzhong; He, Xiangming; Hu, Bonian; Zhang, Jun; Wu, Zhenjun

doi:10.1016/j.apsusc.2009.04.169

Cited by 59 publications

(27 citation statements)

References 21 publications

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“…When Mg is immersed in zincate solution, the following reactions occur [9]: Fig. 3 shows a schematic presentation of the zincate pretreatment process for AZ91 D Mg alloy.…”

Section: Analysis Of the Zincating Processmentioning

confidence: 99%

“…Since a thick passivation film is formed on Mg in the ambient atmosphere, pretreatment is necessary to remove the surface layer and to suppress its reformation prior to the plating process [7][8][9][10]. It is also important to obtain a uniform surface condition on Mg alloys for plating because intermetallic compounds such as Mg x Al y are formed at grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Influence of zincate pretreatment on adhesion strength of a copper electroplating layer on AZ91 D magnesium alloy

Tang

Azumi

2011

Surface and Coatings Technology

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Cu was electrodeposited on AZ91 D Mg alloy with zincate pretreatment in an alkaline plating bath, and the effect of zincate pretreatment on adhesion strength of the Cu layer was investigated. Scanning electron microscopy results showed that Zn was mainly deposited on the α-phase surface, and ultrasonic agitation at the initial stage of the zincate pretreatment improved the coverage of the Zn layer even on the β-phase surface, resulting in enhancement of the adhesion strength of the Zn layer and the successive Cu layer to the substrate.Adhesion tests revealed that the plating layer peeled off at the mixed layer of Zn and Cu deposits formed at the interface between the zincated layer and the electrodeposited Cu layer.A smooth Cu surface was obtained in the plating bath containing H 3 BO 3 .

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“…When Mg is immersed in zincate solution, the following reactions occur [9]: Fig. 3 shows a schematic presentation of the zincate pretreatment process for AZ91 D Mg alloy.…”

Section: Analysis Of the Zincating Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of zincate pretreatment on adhesion strength of a copper electroplating layer on AZ91 D magnesium alloy

Tang

Azumi

2011

Surface and Coatings Technology

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“…To improve the corrosion resistance of Mg alloys, different methodologies [3][4][5][6] have been adopted. Chromating treatment, 7,8 for example, is currently applied to magnesium alloys to achieve adequate corrosion resistance and to improve the adhesion properties of paint.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of Mg alloys by cathodic electrodeposition coating pretreated with silane

Zhang

2010

J Coat Technol Res

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The corrosion resistance characteristics of three coatings on magnesium alloy AZ31-conventional paint with phosphate film, cathodic electrodeposition coating (E-coating), and E-coating pretreated with silane (Mg/silane/E-coating)-have been studied by means of electrochemical impedance spectroscopy (EIS) in a 3.5 wt% NaCl neutral aqueous solution and salt spray test using ASTM B117. Silane film was obtained by dipping AZ31 specimens in diluted hydroalcoholic silanic solutions and successively curing. It was found that the corrosion resistance of the Mg alloy with E-coating was superior to conventional paint and could be further enhanced with silane pretreatment as an interfacial film. The results of water volume fraction (U saturation ) and diffusion coefficient (D) also indicated that the Mg/silane/E-coating possessed excellent compactness and corrosion resistance. A model of the corrosion mechanism for Mg/silane/E-coating has been presented through EIS analysis.

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“…Most of the reports were focused on the adhesion between the electroless coating and the substrates [14,15], much improvement was done for this purpose, however, the subsequent seal treatments are also alternative techniques. Electroplating Ni coating was undertaken on pretreated AZ91D magnesium substrate to improve the corrosion resistance, but with limited electrochemical behavior research [16,17].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of inorganic and organic coatings on AZ91D magnesium alloy with electroless plating pretreatment

Zhang

Yang

et al. 2011

Materials & Corrosion

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In this paper, a protective coating scheme was applied for the corrosion protection of AZ91D magnesium alloy. Electroless Ni coating (EN coating) as bottom layer, electrodeposited Ni coating (ENN coating), and silane-based coating (ENS coating) as top layer, respectively, were successfully prepared on AZ91D magnesium alloy by combination techniques. Scanning electron microscopy and X-ray diffraction were employed to investigate the surface and phase structure of coatings, respectively. The electrochemical corrosion behaviors of coatings in neutral 3.5 wt% NaCl solution were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The corrosion testing showed that the three kinds of coatings all could provide corrosion protection for AZ91D magnesium alloy to a certain extent, and the corrosion resistance of ENN and ENS was superior to EN. In order to further study the corrosion protection properties of ENN and ENS, a comparative investigation on the evolution of EIS of ENN and ENS was carried out by dint of immersion test in neutral 3.5 wt% NaCl solution. The results indicated that, compared with ENN, the ENS could provide longer corrosion protection for AZ91D magnesium alloy. It is significant to determine the barrier effect of each coating, which could provide reference for industry applications.

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Studies on influence of zinc immersion and fluoride on nickel electroplating on magnesium alloy AZ91D

Cited by 59 publications

References 21 publications

Influence of zincate pretreatment on adhesion strength of a copper electroplating layer on AZ91 D magnesium alloy

Influence of zincate pretreatment on adhesion strength of a copper electroplating layer on AZ91 D magnesium alloy

Corrosion protection of Mg alloys by cathodic electrodeposition coating pretreated with silane

Preparation and characterization of inorganic and organic coatings on AZ91D magnesium alloy with electroless plating pretreatment

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