An annealing process for stress relief after bright aluminum plating with ionic liquid

A technology of stress relief annealing and ionic liquid, which is applied in the field of annealing process to reduce the stress of bright aluminum coating, and achieves the effect of smooth and bright surface, low residual stress and satisfying performance requirements.

Active Publication Date: 2018-06-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to research, there are few reports on the stress relief annealing process that can keep the coating bright.

Method used

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  • An annealing process for stress relief after bright aluminum plating with ionic liquid
  • An annealing process for stress relief after bright aluminum plating with ionic liquid
  • An annealing process for stress relief after bright aluminum plating with ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) According to the technical method of the patent (CN 103849911A), on the copper substrate, the bright aluminum coating was obtained by electrodeposition from the ionic liquid, and the measured residual stress of the coating was 843MPa;

[0033] 2) Place the plated parts to be annealed in a well-sealed vacuum annealing furnace. After the furnace is installed, pump the air until the vacuum degree is higher than 10 -5 After Pa, turn on the heating power, raise from room temperature to 200°C in 2 hours, keep the temperature for 2 hours, then cool down from 200°C to room temperature in 2 hours, then turn off the power directly. After stress relief annealing, the coating is bright and smooth, has good bonding force with the substrate, and the residual stress is reduced to 329MPa.

Embodiment 2

[0035] 1) According to the technical method of the patent (CN 103849911A), a bright aluminum coating was obtained by electrodeposition from an ionic liquid on a copper substrate, and the measured residual stress of the coating was 887MPa;

[0036] 2) Place the plated parts to be annealed in a well-sealed vacuum annealing furnace. After the furnace is installed, pump the air until the vacuum degree is higher than 10 -5 After Pa, turn on the heating power, rise from room temperature to 300°C in 2 hours, keep the temperature for 2 hours, then cool down from 300°C to room temperature in 4 hours, then turn off the power directly. After stress relief annealing, the coating is bright and smooth, has good bonding force with the substrate, and the residual stress is reduced to 272MPa.

Embodiment 3

[0038] 1) According to the technical method of the patent (CN 103849911A), on the copper substrate, the bright aluminum coating was obtained by electrodeposition from the ionic liquid, and the measured residual stress of the coating was 913MPa;

[0039] 2) Place the plated parts to be annealed in a well-sealed vacuum annealing furnace. After the furnace is installed, pump the air until the vacuum degree is higher than 10 -5After Pa, turn on the heating power, rise from room temperature to 300°C in 2 hours, keep the temperature for 3 hours, then cool down from 300°C to room temperature in 6 hours, then turn off the power directly. After stress relief annealing, the coating is bright and smooth, has good bonding force with the substrate, and the residual stress is reduced to 265MPa.

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Abstract

The invention provides an annealing technology for lowering the stress of a bright aluminum clad layer in order to solve the problem that residual stress exists in the electroplated bright aluminum clad layer in ionic liquid. In vacuum or inert gases, annealing is conducted according to a certain temperature control procedure, the residual stress of the bright aluminum clad layer can be effectively lowered, the mechanical property is improved, and thus brittle damage of the bright aluminum clad layer in the using process or the subsequent machining process is avoided; meanwhile, the brightness of the bright aluminum clad layer can be maintained. The technology includes the specific implementation steps that under the vacuum condition or the protection of the inert gases, the temperature of the bright aluminum clad layer rises slowly for 1-3 hours to an annealing temperature, the annealing temperature is 200-350 DEG C, the bright aluminum clad layer is kept at a constant temperature for 2-4 hours after the annealing temperature is reached, and the temperature of the bright aluminum clad layer falls slowly for 2-8 hours to an indoor temperature after the constant temperature is completed. The residual stress of the bright aluminum clad layer treated through the technology is lowered obviously, and the post-machining brittle damage rate of bright aluminum clad layer products is effectively lowered.

Description

technical field [0001] The invention relates to a post-treatment method of ionic liquid electroplating bright coating, in particular to an annealing process method for reducing the stress of bright aluminum coating. Background technique [0002] The bright aluminum coating is light in weight, non-toxic, has good thermal and electrical conductivity, and is resistant to corrosion and oxidation, and has the advantages of significantly reducing emissivity, etc., and is used as the underlying film in the solar selective absorption coating. At present, aluminum films are often obtained by processes such as vacuum evaporation, thermal spraying, and magnetron sputtering. However, the high working temperature involved in these processes affects the mechanical properties of the base material to a large extent, and requires a high price. Expensive instruments and equipment are greatly limited in large-scale industrial applications. [0003] The reaction conditions of ionic liquid elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/50
Inventor 张锁江陈斌王倩吕兴梅
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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