A novel process of electroless Ni-P plating with plasma electrolytic oxidation pretreatment

Liu, Zhenmin; Gao, Wei

doi:10.1016/j.apsusc.2006.05.058

Cited by 65 publications

(19 citation statements)

References 12 publications

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“…However, it is still attractive in many research fields with the spreading of its application. Through developing novel surface pretreatment techniques [1] and solution additives [2][3][4][5], and optimizing control factors [6] etc., continuous and intensive studies are contributed to obtain satisfied deposits with desired composition, structures, patterns and properties on various substrates including active dissolving metals [7][8], nonmetallic materials [9][10][11], and semi-conductive materials [12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of complexing agents on acidic electroless nickel deposition

Jin

Yang

et al. 2010

Rare Metals

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Our previous study reported the influences of different complexing agents on electroless nickel (EN) by examining the properties of the deposits. In the present work, the effects of four common-used complexing agents on EN deposition rate and the stability of solution pH values were examined, either with an acetic pH buffer agent or absent of them. It is indicated that the pH buffering effect of them is dominative when the EN solution is lack of the pH buffer. Under this situation, the EN deposition rate increases with the concentration of complexing agents increasing. The EN deposition rate decreases with further adding the complexing agent when the solution already has enough pH buffer capability. Electrochemical impedance spectroscopy obtained during EN deposition illustrates that, in this case, the enhanced reaction resistance is the main reason for a lower deposition rate. However, the influence of polarization caused by mass transfer is not negligible at high complex ratio for sodium citrate and malic acid EN solutions.

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Section: Introductionmentioning

confidence: 99%

Effects of complexing agents on acidic electroless nickel deposition

Jin

Yang

et al. 2010

Rare Metals

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“…Removal of Mg-oxides necessitates neutral or acidic pH and surface roughness of the substrates can be noticeably increased by the acidic pre-treatment [12][13].…”

Section: Resultsmentioning

confidence: 99%

Acid Pickling/polishing of AZ31 Magnesium Alloy

Fazal¹,

Moon²

2016

Journal of the Korean institute of surface engineering

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This article reports a new chemical bath for preparing a mirror-like surface of AZ31 Mg alloy. In order to find an appropriate chemical polishing solution, four different acidic solutions of sulphuric acid, nitric acid, acetic acid and a specially designed mixture of nitric acid and acetic acid were investigated in view of the changes in surface appearance, roughness and dissolution rate of AZ31 Mg alloy. The surface scales on AZ31 Mg alloy were readily removed by all the acidic solutions, but a reflective surface was produced only by etching in the specially designed solution, and only after a specific etching time. The surface roughness increased with etching time in sulphuric acid, nitric acid, and acetic acid, but it lowered after a specific etching time in the specially designed mixture of nitric acid and acetic acid. Dissolution rate of the alloy in the specially designed mixture of nitric acid and acetic acid appeared to be more than twice than that in separate nitric acid or acetic acid. In this work, we recommend the mirror-like surface of AZ31 Mg alloy obtained by polishing for an optimum time in a mixture of nitric acid and acetic acid for following surface finishings, chemical conversion coating, electroplating, electrophoretic painting and anodizing treatment.

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“…The role of conducting polymers as coatings for magnesium alloys was also documented in literature [11 -13]. Beneficial effects of duplex coatings in the form of PEO-physical vapour deposition, PEO-electroless nickel and PEO-composite coatings on the wear and corrosion behaviour of magnesium alloys have been reported recently [14][15][16].…”

Section: Introductionmentioning

confidence: 89%

Enhanced corrosion protection of AZ31 magnesium alloy by duplex plasma electrolytic oxidation and polymer coatings

Srinivasan¹,

Scharnagl²,

Blawert³

et al. 2010

Surface Engineering

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The corrosion behaviour of an AZ31 magnesium alloy coated with plasma electrolytic oxidation (PEO), polymer and a combination of was assessed in by electrochemical impedance spectroscopy (EIS) in both 0.1 M NaCl solution. The polymer coating was applied on a just cleaned surface (without any special preparation) and also on PEO treated magnesium substrate. While the polymer coated and the mere PEO treated magnesium alloy specimens lasted less than 50 hours in the EIS tests, the specimens with the duplex coating (PEO + polymer) successfully resisted 1000 hours in the EIS tests without showing any degradation. The improved adhesion of the polymer coating in presence of the PEO layer and the effective sealing of the pores in the PEO coating with the polymer were responsible for the enhanced corrosion resistance. The synergistic beneficial effect of the duplex coatings on the corrosion behaviour was also witnessed in the salt spray tests.

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A novel process of electroless Ni-P plating with plasma electrolytic oxidation pretreatment

Cited by 65 publications

References 12 publications

Effects of complexing agents on acidic electroless nickel deposition

Effects of complexing agents on acidic electroless nickel deposition

Acid Pickling/polishing of AZ31 Magnesium Alloy

Enhanced corrosion protection of AZ31 magnesium alloy by duplex plasma electrolytic oxidation and polymer coatings

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