Preparation and magnetic properties of Ni–P–La coating by electroless plating on silicon substrate

Gao, Yun; Wang, Jihui; Yuan, Jing; Li, Haiqin

doi:10.1016/j.apsusc.2015.12.201

Cited by 16 publications

(3 citation statements)

References 24 publications

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“…The soluble compounds were another available source of RE additive, which featured high activation degree and strong adsorption capacity by generating positive free-stated ions into electrolytes. It was generally considered that the RE ions with large atomic radius and low electronegativity were easily adsorbed on the cathode surface, which interrupted the coarse grains and increased the polarizability of cathode [19]. Moreover, the RE ions with unique electronic shell structures possessed many empty or half-filled orbitals, which further led to an increase in nucleation rate [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of rare–earth (Ce, La) compounds on the microstructure, mechanical and electrochemical corrosion characteristics of electroplated Ni films

Chen

Wang

2023

Surf. Topogr.: Metrol. Prop.

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For optimizing the microstructure and performance of Ni–electroplating film, the soluble rare–earth (RE) compounds CeCl3 or LaCl3 were introduced, which were electrodeposited on Cu substrate by direct current (DC) and pulse current (PC) methods, respectively. The surface characteristics of morphology, composition, and phase of obtained different deposits were investigated, and the relationship between the structure and the performance of internal stress, hardness, and electrochemical responses was discussed. The results show that both RE compounds were conducive to eliminating the surface pits by inhibiting the hydrogen evolution reaction, while did not co–deposit into the Ni film. Moreover, the preferred orientation of Ni (111) crystalline plane was altered into Ni (200) by LaCl3, and its combination with PC–electrodeposition further had a better grain refinement effect than CeCl3. Due to the formation of a relatively dense and fine deposit, the PC–electrodeposited Ni/LaCl3 film exhibited the highest hardness of 320 HV, lowest tensile stress of 55 MPa, and best electrochemical passivation protection, which effectively improved the comprehensive performance of Ni film and demonstrated a good prospect for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Effect of rare–earth (Ce, La) compounds on the microstructure, mechanical and electrochemical corrosion characteristics of electroplated Ni films

Chen

Wang

2023

Surf. Topogr.: Metrol. Prop.

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“…On the other hand, the rare earth elements (RE) were reported as a typically industrial monosodium glutamate to modulate the corrosion resistance of Mg. Such as Ce, Nd, Y and La based on their unique electronic layer structure [27][28][29] . Ce and Nd elements can be introduced into the plating solution to improve the corrosion resistance of AZ91D magnesium alloy without any deterioration in their mechanical properties [30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare Earth on the Corrosion Resistance of Electroless Ni-Mo-P Composite Coatings

et al. 2022

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A kind of corrosion-resistant Ni-Mo-P composite coating was deposited on the surface of AZ91D magnesium alloy substrate by electroless plating method with different concentration of Ce(NO 3 ) 3 and Nd(NO 3 ) 3 . The deposition mechanism of Ni-Mo-P composite coating was explored. Furthermore, the effects of Ce(NO 3 ) 3 and Nd(NO 3 ) 3 concentration on the microstructure and properties of Ni-Mo-P composite coatings were studied. Results indicated that the Ni-Mo-P composite coatings prepared by adding the optimal concentration of Ce(NO 3 ) 3 and Nd(NO 3 ) 3 had few defects. Meanwhile, the deposition rate of the composite coatings and the adhesion between the coating and the magnesium alloy substrate were improved. When the concentration of Ce(NO 3 ) 3 and Nd(NO 3 ) 3 were 0.10 and 1.00 g/L, the Ni-Mo-P composite coatings had the minimum corrosion rate of 0.826 and 0.681 g/m 2 •h, respectively. Herein, compared with the addition of Ce(NO 3 ) 3 , the Nd(NO 3 ) 3 added Ni-Mo-P composite coating has the maximum arc radius of capacitive resistance and significant improvement corrosion resistance.

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“…Electroless Ni-P coating offers excellent corrosion resistance, wear resistance, high hardness, uniform thickness, and good adhesion, making it extremely promising for applications in industries such as aerospace, petroleum and chemical, printing, computer manufacturing, and automobile manufacturing. [1][2][3][4][5][6][7][8] By implementing the electroless plating process, the surface properties of aluminum alloy materials can be significantly improved, and their durability and service life can be effectively increased, thereby greatly expanding the application range of aluminum alloys in all kinds of harsh environmental conditions and service effectiveness. [9][10][11] To attain the desired deposition rate, the temperature of the bath is usually controlled in the range of 80 to 90 °C.…”

mentioning

confidence: 99%

A Microporous Channel Copper Immersion Layer Promotes the Rapid Ni-P Electroless Plating Process on Aluminum Alloys at Medium and Low Temperatures

Zhu,

Wang,

Sun

et al. 2024

J. Electrochem. Soc.

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Electroless plating is a commonly used method to enhance the corrosion resistance, wear resistance, and decorative performance of aluminum alloys. However, in electroless plating processes, it is customary to maintain the solution temperature at levels exceeding 85°C, a critical condition that ensures a sufficiently rapid deposition rate and thereby fosters the formation of high-performance coatings. Conventional immersion pretreatments with zinc and palladium result in lower deposition rates at low temperatures. This study shows that a copper immersion layer with microporous channels can facilitate the electroless plating process for aluminum alloys at lower temperatures. Through a redox reaction in a Cu2+-containing solution at 70°C, a copper immersion layer with a microporous structure could be created on an aluminum alloy. The microporous channels between the copper immersion layer and the aluminum alloy create electrochemical corrosion cells in the plating solution, accelerating the electroless plating process. The Ni-P coating obtained after pretreatment by copper immersion has a higher hardness (578 HV) and a lower corrosion current density (0.55 μA/cm2). This work provides a practical method to rapidly fabricate high-performance Ni-P coatings at intermediate temperatures (70-75°C).

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Preparation and magnetic properties of Ni–P–La coating by electroless plating on silicon substrate

Cited by 16 publications

References 24 publications

Effect of rare–earth (Ce, La) compounds on the microstructure, mechanical and electrochemical corrosion characteristics of electroplated Ni films

Effect of rare–earth (Ce, La) compounds on the microstructure, mechanical and electrochemical corrosion characteristics of electroplated Ni films

Effect of Rare Earth on the Corrosion Resistance of Electroless Ni-Mo-P Composite Coatings

A Microporous Channel Copper Immersion Layer Promotes the Rapid Ni-P Electroless Plating Process on Aluminum Alloys at Medium and Low Temperatures

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