Corrosion and wear behavior of an electroless Ni-P/nano-SiC coating on AZ31 Mg alloy obtained through environmentally-friendly conversion coating

Ghavidel, Nafiseh; Allahkaram, Saeed Reza; Naderi, Reza; Barzegar, M.; Bakhshandeh, H.R.

doi:10.1016/j.surfcoat.2019.125156

Cited by 85 publications

(16 citation statements)

References 67 publications

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“…It can be further noticed that there is a decrease in the indentation depth of ~ 7 nm at the terminal composition (2.0 g L −1 TiC). This is because of the fact that an excessive amount of reinforcement accumulates in the matrix and thus harms the mechanical properties are in agreement with previous studies 67 , 68 . The maximum decrease in the indentation depth is observed at 1.5 g L −1 of TiC due to the uniform distribution of the reinforcing phase in the matrix without any significant agglomeration.…”

Section: Resultssupporting

confidence: 92%

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Fayyaz

Khan

Shakoor

et al. 2021

Sci Rep

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In the present study, the effect of concentration of titanium carbide (TiC) particles on the structural, mechanical, and electrochemical properties of Ni–P composite coatings was investigated. Various amounts of TiC particles (0, 0.5, 1.0, 1.5, and 2.0 g L−1) were co-electrodeposited in the Ni–P matrix under optimized conditions and then characterized by employing various techniques. The structural analysis of prepared coatings indicates uniform, compact, and nodular structured coatings without any noticeable defects. Vickers microhardness and nanoindentation results demonstrate the increase in the hardness with an increasing amount of TiC particles attaining its terminal value (593HV100) at the concentration of 1.5 g L−1. Further increase in the concentration of TiC particles results in a decrease in hardness, which can be ascribed to their accumulation in the Ni–P matrix. The electrochemical results indicate the improvement in corrosion protection efficiency of coatings with an increasing amount of TiC particles reaching to ~ 92% at 2.0 g L−1, which can be ascribed to a reduction in the active area of the Ni–P matrix by the presence of inactive ceramic particles. The favorable structural, mechanical, and corrosion protection characteristics of Ni–P–TiC composite coatings suggest their potential applications in many industrial applications.

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Section: Resultssupporting

confidence: 92%

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Fayyaz

Khan

Shakoor

et al. 2021

Sci Rep

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“…Figure 7(a) clearly shows the shift in the corrosion potential values of the Ni-P-B coating from more negative to more positive potentials in relation to the AZ91D magnesium substrate. The addition of nano-Al 2 O 3 particles to Ni-P-B baths has been shown to have a beneficial effect on corrosion [28,33,56]. This is likely due to the reduction of metallic area (active surface), which can lead to a decrease in corrosion rates [28].…”

Section: = --mentioning

confidence: 99%

“…In order to solve these difficulties, we present a unique Ni-P-B electroless coating technique on magnesium alloys that takes advantage of both Ni-P and Ni-B coating to improve their corrosion resistance and microhardness while reducing their weight [30]. In addition, abrasion resistance and anti-corrosion properties of magnesium alloys have been enhanced further by the inclusion of nano additives such as Al 2 O 3 , SiC, SiO 2 , TiO 2 , ZnO, and other metal oxides [28,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Electroless Ni–P–B coatings on magnesium alloy AZ91D: influence of nano Al₂O₃ on corrosion, wear, and hardness behaviour

Lakavat¹,

Bhaumik²,

Gandi³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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This study examines the effect of nano Al2O3 additions on the corrosion, wear, and hardness properties of an electroless Ni-P-B protective coating on AZ91D magnesium alloy. In this work, nano alumina particles with a diameter of 40-50 nm and a weight percentage of 1, 2, and 3% were used in an alkaline Ni-P-B electroless bath. The surface morphology of the nano-composite coating was studied by scanning electron microscopy (SEM) and the crystalline structure of the coating was examined by x-ray diffractometer (XRD). The inclusion of alumina nanoparticles, an electroless deposit produces a homogeneous coating on the AZ91D magnesium alloy surfaces. The experimental results show that incorporating 2wt% alumina nanoparticles into an electroless Ni-P-B coating increases microhardness (986.4-VHN200), specific wear rate (1.2×10-10 Kg/N-1m-1) and has the lowest average friction coefficient (0.08) when compared to other coated and uncoated samples. Electrochemical polarisation and electrochemical impedance spectroscopic (EIS) tests in 3.5 wt.% NaCl solution were used to investigate the corrosion resistance of various nano Al2O3 additive Ni-P-B coatings on Mg alloy surfaces. Potentiodynamic polarisation studies show that 2wt% of nano Al2O3 incorporation in Ni-P-B coating on magnesium substrates has good corrosion resistance, with the coating resulting in the lowest corrosion rate (icorr = 1.47×10-8 A cm-2) and the most positive corrosion potential (Ecorr=0.55V).

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“…It is clear that by adding more nanosol to the bath, the hardness increases to a maximum value of 569 HV for Ni-P-(sol)Al 2 O 3 and then decreases. On one hand, Al 2 O 3 nanoparticles can act as a barrier against plastic deformation and increase microhardness of the coating by preventing the movement of dislocations [32,33]. On the other hand, nanoparticles improved the grain refinement of the matrix and hence favor the higher microhardness of nanocomposite coating (Figure 6) [11].…”

Section: Effect Of Al 2 O 3 Sol On Microhardness Of Compositementioning

confidence: 99%

Preparation of Sol-Enhanced Ni–P–Al₂O₃ Nanocomposite Coating by Electrodeposition

Zhang

et al. 2020

Journal of Nanomaterials

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A Ni–P–(sol)Al2O3 coating was prepared on the surface of Q235 steel by direct-current electrodeposition. This method was combined with sol-gel and electrodeposition technique, instead of the traditional nanopowder dispersion, to prepare highly dispersible oxide nanoparticle-reinforced composites. The effects of temperature, pH value, and current density and Al2O3 sol on the hardness of composite coating were investigated. The coating surface morphology and structure were characterized by scanning electron microscopy and energy dispersive spectroscopy, respectively. The corrosion resistance of coatings in the presence of intermediate layers was evaluated by electrochemical measurement in 3.5% NaCl solution by open-circuit potential measurement at room temperature. The hardness and wear resistance of the coating were measured by a microindentation instrument and friction wear machine, respectively. The results showed that Al2O3 sol can effectively improve Ni–P alloy coating structure and refine grain. When the bath temperature was 55°C, the pH value was 4.5, the amount of sol was 80 mL/L, the current density was 1 A/dm2, and the hardness of the nanosol coating was 569 HV. Compared with Ni–P, the friction coefficient increases slightly, but the wear rate was only 1.768×10−6 g·m−1. The corrosion resistance was also better than that of Ni–P coating.

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Corrosion and wear behavior of an electroless Ni-P/nano-SiC coating on AZ31 Mg alloy obtained through environmentally-friendly conversion coating

Cited by 85 publications

References 67 publications

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Electroless Ni–P–B coatings on magnesium alloy AZ91D: influence of nano Al₂O₃ on corrosion, wear, and hardness behaviour

Preparation of Sol-Enhanced Ni–P–Al₂O₃ Nanocomposite Coating by Electrodeposition

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Corrosion and wear behavior of an electroless Ni-P/nano-SiC coating on AZ31 Mg alloy obtained through environmentally-friendly conversion coating

Cited by 85 publications

References 67 publications

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Enhancement of mechanical and corrosion resistance properties of electrodeposited Ni–P–TiC composite coatings

Electroless Ni–P–B coatings on magnesium alloy AZ91D: influence of nano Al2O3 on corrosion, wear, and hardness behaviour

Preparation of Sol-Enhanced Ni–P–Al2O3 Nanocomposite Coating by Electrodeposition

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Electroless Ni–P–B coatings on magnesium alloy AZ91D: influence of nano Al₂O₃ on corrosion, wear, and hardness behaviour

Preparation of Sol-Enhanced Ni–P–Al₂O₃ Nanocomposite Coating by Electrodeposition