Crystalline grain scale gradient metallic nickel and controllable preparation method thereof

A technology of metal nickel and grain size, applied in the direction of cells, electrolytic process, electrolytic components, etc., can solve the problem of non-interface existence and other problems

Active Publication Date: 2015-08-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the lack of effective preparation methods for the current gradient structure metal materials, the present invention provides a gradient metal nickel with low cost and easier industrial production and a preparation method thereof. The size of this gradient structure metal nickel is almost unlimited (≥5mm, such as figure 1 ), the gradient distribution form is controllable, the grai

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  • Crystalline grain scale gradient metallic nickel and controllable preparation method thereof
  • Crystalline grain scale gradient metallic nickel and controllable preparation method thereof
  • Crystalline grain scale gradient metallic nickel and controllable preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Use nickel as the consumable anode and titanium cathode, and configure 800ml of plating solution as required. The composition of the plating solution is:

[0021] NiSO 4 ·7H 2 O:300g / L, NiCl 2 ·6H 2 O: 45g / L, H 3 BO 3 :40g / L, C 12 h 25 OSO 2 Na: 0.05g / L. Weigh the above drugs with a balance and dissolve them in a beaker so that the volume of the solution is no more than three-quarters of the rated volume of the beaker. Stir the prepared plating solution with a magnetic stirrer and adjust the pH value to 4±0.2 with sodium hydroxide solution. The bath temperature is controlled at 55±1°C.

[0022] Computer controlled current density and additive concentration:

[0023] Current density: (1), the current density remains constant at 10mA / cm within the first 47.5h 2 , (2), after 0.75h the current density is changed from 10mA / cm 2 Gradually increase to 20mA / cm 2 , (3), and then within 0.75h the current density gradually increased to 30mA / cm 2 , (4), continue to gr...

Embodiment 2

[0027] Use nickel as the consumable anode and titanium as the cathode, configure 800ml of plating solution as required, and the composition of the plating solution is:

[0028] NiSO 4 ·7H 2 O:300g / L, NiCl 2 ·6H 2 O: 45g / L, H 3 BO 3 :40g / L, C 12 h 25 OSO 2 Na: 0.05g / L. Weigh the above drugs with a balance and dissolve them in a beaker so that the volume of the solution is no more than three-quarters of the rated volume of the beaker. Stir the prepared plating solution with a magnetic stirrer and adjust the pH value to 4±0.2 with sodium hydroxide solution. The bath temperature is controlled at 55±1°C.

[0029] Computer controlled current density and additive concentration:

[0030] The control current density is mainly divided into six stages: (1), the current density is kept constant at 5mA / cm in the first 25h 2 , (2), within 3h after that, the current density changed from 5mA / cm 2 Gradually increase to 20mA / cm 2 , (3), and then gradually increased to 30mA / cm withi...

Embodiment 3

[0034] With nickel as the consumption anode and steel as the cathode, configure 800ml of plating solution as required. The composition of the plating solution is:

[0035] NiSO 4 ·7H 2 O:300g / L, NiCl 2 ·6H 2 O: 45g / L, H 3 BO 3 :40g / L, C 12 h25 OSO 2 Na: 0.06g / L. Weigh the above drugs with a balance and dissolve them in a beaker so that the volume of the solution is no more than three-quarters of the rated volume of the beaker. Stir the prepared plating solution with a magnetic stirrer and adjust the pH value to 4±0.2 with sodium hydroxide solution. The bath temperature is controlled at 55±1°C.

[0036] Computer controlled current density and additive concentration:

[0037] Current density: (1), first keep the current density constant at 7mA / cm for 18h 2 , (2), and then within 3h the current density is changed from 7mA / cm 2 Gradually increase to 20mA / cm 2 , (3), the current density gradually increased to 30mA / cm in the following 3h 2 , (4), continue to gradually i...

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Abstract

Aiming to the defect of a preparation method of a gradient metal material at present, the invention provides gradient metallic nickel being low in cost and easier in industrial production, and a preparation method of the gradient metallic nickel. The controllable preparation method is characterized in that an electroplating method is adopted to prepare the gradient metallic nickel, nickel is taken as a sacrificial anode, the variation of current density, additive concentration along with the time is controlled by a computer according to different microstructures or mechanical property requirements, nickel deposits under direct-current action to form crystalline grain scale gradient metallic nickel. The size of the gradient metallic nickel is almost not limited, the gradient distribution form is controllable, the size of a crystalline grain is gradually increased from 10-100 nm to 1-30 micron; no interfaces exist among hierarchical structure parts; the gradient metallic nickel is excellent in mechanical property, larger than or equal to 750 MPa in yield strength, 3-4 times of a traditional coarse grain in grain size, reaches more than 10% in tensile plastic deformation, and larger than or equal to 99.5% in overall sample density.

Description

technical field [0001] The invention relates to metallic nickel with grain size gradient and a controllable preparation method thereof with excellent mechanical properties. Background technique [0002] Gradient structure is a structural material that gradually transitions from one composition, organization or phase (or component) to another composition, organization or phase (or component), such as gradually transitioning from coarse grain to fine grain, or even amorphous structure. Different from traditional homogeneous simple materials or homogeneous single-level composite materials, gradient materials are characterized by heterogeneity and multi-scale organization, as well as multi-level structure. Due to the smooth organization and phase transition, the interface is widened or even disappeared. Different from traditional composite materials, this kind of structural gradient can not only effectively avoid the performance mutation caused by size mutation, but also make s...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D21/14
Inventor 李毅潘杰林研王寅霄
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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