The Effect of Adding Corrosion Inhibitors into an Electroless Nickel Plating Bath for Magnesium Alloys

Hu, Rong; Su, Yijin; Liu, Hongdong; Cheng, Jiang; Yang, Xin; Shao, Zhongcai

doi:10.1007/s11665-016-2265-3

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…Figure 2a is the morphology image of Mg substrate immersion in the plating bath for 0.5 min, a large number of cubic structure particles distributed on its surface. These cubic particles are confirmed as MgF 2 , which mainly forms in HF activation process, in consistent with the literature reports [23, 27]. However, the morphology of the image of Fig.…”

Section: Resultssupporting

confidence: 91%

“…The experiment sweeping rate was 5 mV/s and was performed at 25 °C. The micro-hardnesses of the magnesium alloy with various composite coatings were evaluated by using a HXD-1000 micro-hardness tester with a Vicker indenter at a load of 100 g and durable time of 15 s. Thermal shock test was carried out to evaluate the adhesion of coatings [23]. It was described as follows: in an air atmosphere, the Mg substrate with Ni-P coating or Ni-P-Al 2 O 3 coating was placed in a high-temperature box resistance furnace and heated to 250 ± 10 °C by a heating rate of 20 °C min −1 then quenched in a cold water.…”

Section: Methodsmentioning

confidence: 99%

“…are usually added into electroless plating bath to prepare Ni-P nanoparticle composite coatings [16–20]. According to previous studies [20–23], the performance of the Ni-P coating is effectively improved by nanoparticles. Although the Ni-P nanoparticle composite coatings have relatively high performance compared with the Ni-P coating, there are three problems that have to be noted.…”

Section: Introductionmentioning

confidence: 99%

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Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

Liu

et al. 2018

Nanoscale Res Lett

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To improve the corrosion resistance and wear resistance of electroless nickel-phosphorus (Ni-P) coating on magnesium (Mg) alloy. Ni-P-Al2O3 coatings were produced on Mg alloy from a composite plating bath. The optimum Al2O3 concentration was determined by the properties of plating bath and coatings. Morphology growth evolution of Ni-P-Al2O3 composite coatings at different times was observed by using a scanning electronic microscope (SEM). The results show that nano-Al2O3 particles may slow down the replacement reaction of Mg and Ni2+ in the early stage of the deposition process, but it has almost no effect on the rate of Ni-P auto-catalytic reduction process. The anti-corrosion and micro-hardness tests of coatings reveal that the Ni-P-Al2O3 composite coatings exhibit better performance compared with Ni-P coating owing to more appropriate crystal plane spacing and grain size of Ni-P-Al2O3 coatings. Thermal shock test indicates that the Al2O3 particles have no effect on the adhesion of coatings. In addition, the service life of composite plating bath is 4.2 metal turnover, suggesting it has potential application in the field of magnesium alloy.

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Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

Liu

et al. 2018

Nanoscale Res Lett

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“…7 achieves the worst corrosion resistance, yet its coating thickness is not the thinnest ( Table 3), indicating that besides coating thickness, other factors such as chemical compositions and surface morphology of MAO coatings can also influence the corrosion resistance. NH 4 HF 2 , an acidic fluorine-containing substance, is usually used as a corrosion inhibitor for magnesium alloy in electroless nickel plating [33,34]. The measured I corr in 4 g/L NH 4 HF 2 is very low and anodic coatings can be developed in the solution (Figure 8a).…”

Section: Influence Of Processing Factors On Corrosion Resistancementioning

confidence: 99%

Investigation on Corrosion Resistance and Formation Mechanism of a P–F–Zr Contained Micro-Arc Oxidation Coating on AZ31B Magnesium Alloy Using an Orthogonal Method

et al. 2019

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In this study, the synergistic effects of NH4HF2, sodium phytate (Na12Phy), K2ZrF6, and treatment time on corrosion resistance of a micro-arc oxidation (MAO) treated magnesium alloy and the entrance mechanism of P, F, and Zr into anodic coatings were investigated using an orthogonal method. In addition, the roles of NH4HF2, Na12Phy, and K2ZrF6 on coating development were separately studied. The results show that NH4HF2 and Na12Phy, the corrosion inhibitors of magnesium alloys, are beneficial but K2ZrF6 is harmful to developing anodic coatings. The corrosion resistance of MAO coatings is synergistically determined by coating characteristics, though the coating thickness plays a main role. Na12Phy significantly improves but NH4HF2 decreases the corrosion resistance of MAO coatings, while excess high K2ZrF6 is harmful to the coating corrosion resistance. Treatment time can increase the coating thickness but is the least important factor in corrosion resistance. During MAO, NH4HF2, Na12Phy, and K2ZrF6 take part in coating formation, causing P, F, and Zr to compete with each other to enter into anodic coatings.

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“…Magnesium (Mg) alloy is being used as structural component in various industries because of its low densit y, high strength-to-weight ratio and relatively high stiffness [8].…”

Section: Introductionmentioning

confidence: 99%

Deposition of Electroless (Ni-P-ZnO) Ternary Alloy for Adhesion Strength on Magnesium (AZ91) Alloy: Effect of Surfactant

2017

Aug. 8-9, 2017 Singapore Back RTET-17, CFBHS-17, IECMAE-17, AESTWM-17, LHHSS-17 &Amp; LEBCSR-17

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Abstract-M agnesium (AZ91) based alloy are being used as structural components in industry because of their high strength-toweight ratio and relatively high stiffness. A shortcoming of AZ91 based alloys is their poor wear and corrosion resistance. Therefore, surface treatment or coatings are needed for protection purpose. Electroless coatings are recognized for their excellent properties and their utilization has witnessed a staggering increase during the last few decades. This present study shows our work on electroless Ni-PZnO ternary alloy coatings on AZ91 alloy with influence of anionic surfactant. Results revealed that at an optimum concentration of the surfactant, the coatings obtained a smoother surface and good adhesion as compared to the coating obtained absence of the surfactant. As-deposited substrates were characterized by field emission scanning electron microscopy and energy dispersive X-ray analysis (FESEM -EDAX).

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The Effect of Adding Corrosion Inhibitors into an Electroless Nickel Plating Bath for Magnesium Alloys

Cited by 11 publications

References 21 publications

Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

Deposition Process and Properties of Electroless Ni-P-Al2O3 Composite Coatings on Magnesium Alloy

Investigation on Corrosion Resistance and Formation Mechanism of a P–F–Zr Contained Micro-Arc Oxidation Coating on AZ31B Magnesium Alloy Using an Orthogonal Method

Deposition of Electroless (Ni-P-ZnO) Ternary Alloy for Adhesion Strength on Magnesium (AZ91) Alloy: Effect of Surfactant

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