Protective agent composition and corrosion resistant bonding wire and preparation method thereof

A protective agent and composition technology, which is applied in the field of bonding wire, can solve the problems of reducing the reflectivity of metallic silver, the decrease of reflectivity, and the decrease of reaction rate, and achieve the effects of good non-toxicity, environmental protection, easy operation, and simple process

Active Publication Date: 2017-05-31
晶逸科技(佛山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silver directly exposed to the air can easily react with hydrogen sulfide, oxygen, etc. to form silver sulfide
This not only greatly reduces the reflectivity of metallic silver, but also affects the conductivity and welding performance of metallic silver, which has become the main factor restricting the large-scale application of silver bonding wire.
[0004] At present, the main methods commonly used at home and abroad to prevent the discoloration of silver bonding wires are: plating precious metals on the surface of silver bonding wires, bright silver plating, chemical passivation with chromic acid, and dip-coating organic anti-silver discoloration agents. The final silver bonding wire will not only reduce the conductivity, but also reduce the reflectivity, and the reaction rate can be reduced by 5-15%, which seriously affects the use of silver bonding wire

Method used

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  • Protective agent composition and corrosion resistant bonding wire and preparation method thereof
  • Protective agent composition and corrosion resistant bonding wire and preparation method thereof
  • Protective agent composition and corrosion resistant bonding wire and preparation method thereof

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preparation example Construction

[0035] The present invention has no special limitation on the preparation method of the protective agent composition, as long as the components in the protective agent composition are mixed.

[0036] The invention provides a corrosion-resistant bonding wire, comprising:

[0037] bonding wire;

[0038] A protective film attached to the surface of the bonding wire, the protective film is formed by the protective agent composition described in the above technical solution.

[0039] The present invention has no special limitation on the type of bonding wire, and silver bonding wire, copper bonding wire, aluminum bonding wire, silver-plated gold-plated bonding wire or copper-palladium-plated bonding wire well known to those skilled in the art are used. Can.

[0040] The protective film formed by the protective agent composition provided by the invention is non-toxic and complies with the ROHS standard. After being used for the protection of bonding wires, the corrosion resistanc...

Embodiment 1

[0048] Mix 10 g of picolinate chromium salt, 20 g of sodium chloride conductive salt and 20 g of formic acid solvent to obtain a protective agent composition.

[0049] A silver wire (purity: 99.99%) with a diameter of 360 μm was roughly drawn on a wire drawing machine to obtain a silver bonding wire with a diameter of 80 μm.

[0050] The bonded wire after the rough wire drawing was used as the cathode and immersed in the above protective agent composition at 30°C, the voltage was adjusted to 10V, the passivation time was 2s, and the current density reached 7.5-10A / dm 2 Pass about 3~4C / dm 2 electricity, to obtain corrosion-resistant bonding wires, and then finely drawn to a diameter of 20 μm.

Embodiment 2

[0052] 10g of CrCl 3 Salt, 20g of sodium sulfate and 20g of citric acid solvent were mixed to obtain a protective agent composition.

[0053] A copper wire (purity: 99.99%) with a diameter of 360 μm was drawn on a wire drawing machine to obtain a thick copper bonding wire with a diameter of 80 μm.

[0054] Immerse the above-mentioned bonded wire after coarse wire drawing as a cathode in the above-mentioned protective agent composition at 15°C, adjust the voltage at 30V, and passivation time for 35s. 2 Pass about 4~6C / dm 2 Electricity, to obtain corrosion-resistant bonding wire, and then fine wire drawing to 20μm.

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Abstract

The invention provides a protective agent composition. The protective agent composition comprise Cr3+ salt, conductive salt and solvents. The conductive salt is selected from one kind or certain kinds of sulfate of alkali metal, nitrate of alkali metal and chlorate of alkali metal. The solvents are selected from one kind or certain kinds of formic acid, acetic acid, methanol, glycine, citric acid and oxalic acid. Compared with the prior art, the protective agent composition provided by the invention contains the Cr3+ salt, the non-toxic and environmental-friendly Cr3+ salt serves as a film coating solution to conduct cathode passivation process operation, a transparent protective film with the low content of the Cr3+ salt can be formed on the surface of a bonding wire, the protective agent composition forms the protective film on the surface of the bonding wire, the bonding wire is prevented from color change caused by suffering the corrosion of oxides and sulfides, meanwhile the original reflective rate and electrical conductivity of the bonding wire are not reduced, and the cost is low. The invention further provides the corrosion resistant bonding wire and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of bonding wires, in particular to a protective agent composition, an anti-corrosion bonding wire and a preparation method thereof. Background technique [0002] Bonding wires are mainly composed of gold wires, copper wires, aluminum wires, silver wires, and noble / base metal composites (such as palladium-coated copper wires). Among them, aluminum wire and copper wire are mainly used in middle and low-grade circuits, and precious metal wires are mainly used in middle and high-end products or military products due to cost reasons. [0003] As a precious metal bonding wire, silver bonding wire has a white and bright appearance of metallic silver, excellent electrical conductivity, ductility and high reflectivity. Based on these characteristics of silver, silver bonding wire is widely used in precision connection technology fields such as LED lights, mobile phone components, and semiconductor packaging. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/38C25D7/06
CPCC25D7/0607C25D11/38
Inventor 杨斌张昱赖韬崔成强
Owner 晶逸科技(佛山)有限公司
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