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Agent for treatment of metal surface

A surface treatment agent, metal technology, applied in the direction of electrical components, circuits, semiconductor devices, etc., can solve the problems of not developing effective technology, the influence of silver film light reflectivity, the reduction of light reflection performance, etc., to achieve the characteristics of metal wire welding Excellent effect, good solder wettability, and excellent safety

Inactive Publication Date: 2012-10-03
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, silver is active, and the surface of the silver film is easily discolored by oxidation, etc., which affects the light reflectivity of the silver film and reduces its performance.
In particular, discoloration due to heat treatment in the LED manufacturing process, and discoloration in the high-temperature environment applied during use, resulting in a decrease in light reflection performance
[0011] However, no effective technology has been developed for the improvement of the light reflection performance of the silver film, or the reduction of the light reflection performance due to oxidative discoloration, especially discoloration under high temperature environments. Use of white light sources that require high luminance for lighting, etc., requires the above improvements

Method used

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  • Agent for treatment of metal surface
  • Agent for treatment of metal surface
  • Agent for treatment of metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] As the substrate to be treated, use a pure copper substrate plated with a 4μm thick silver layer, soak it in the surface treatment agent of the following composition at 40°C for 30 seconds, then wash it with water, and dry it with warm air with a blower. for surface treatment.

[0074] Composition of surface treatment agent

[0075] Inhibitor: Triazine-2,4,6-trithiol 0.01% by weight

[0076] Surfactant: oleyl alcohol ethoxylate 0.01% by weight

[0077] Dissolving aid: propylene glycol butyl ether 1% by weight

[0078] pH buffer: Sodium hydrogen phosphate 1% by weight

[0079] Phosphoric acid was used as a pH adjuster to adjust the pH to 5.5.

[0080] For the surface-treated substrate of Example 1, a hydrogen sulfide gas test was performed based on JISH8502 without heat treatment (hydrogen sulfide concentration: 3ppm, temperature: 40°C, humidity: 80%RH, test time: 4 hours) , to observe the appearance with the naked eye. In addition, after heat treatment at 200° C. ...

Embodiment 2~8

[0086] Embodiment 2~8, comparative example 1~8

[0087] Inhibitor and pH buffering agent in embodiment 1 are changed into compound and concentration recorded in table 1, and the pH value is changed into the value shown in table 1 with phosphoric acid, except that, carry out treated group similarly with embodiment 1 The surface treatment of the material was evaluated in the same manner as in Example 1.

[0088] The results are shown in Table 1.

[0089] [Table 1]

[0090]

[0091] Using the surface-treated substrates of Examples 1, 2, 7, and Comparative Example 1, evaluations of contact resistance, solder wettability, wire bonding properties, and reflectance were performed in the following manner. The results are shown in Table 2.

[0092] (1) Contact resistance

[0093] The contact resistance was measured at a DC of 7.4 mA, an open voltage of 20 mV, and a load of 2.5 to 50 g. The criteria for judging the contact resistance are as follows.

[0094] ○: Contact resistanc...

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PUM

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Abstract

Disclosed is an agent for treating a metal surface, which can exhibit a high discoloration-preventing effect even when exposed to a heat treatment during a production process thereof or high temperature environments during use, has excellent wire bonding properties, and does not cause the deterioration in reflectivity when subjected to a surface treatment. The agent for treating a metal surface is characterized by being produced by dissolving or dispersing, as an inhibitor, at least specific compound selected from the group consisting of a benzotriazole compound represented by general formula (1), a mercaptobenzothiazole compound represented by general formula (2) and a triazine compound represented by general formula (3) in water and adjusting the pH value of the solution or dispersion to 4 to 7.

Description

technical field [0001] The present invention relates to surface treatment agents for metals, especially silver or silver alloys. Background technique [0002] As connectors for connecting parts for electronic equipment, brass and phosphor bronze surfaces are plated with copper and nickel bases, and further silver is plated on the bases. Since silver is a good conductor of electricity and heat, silver is used as a plating for connectors, lead frames, etc. as described above. However, the silver-plated material is easy to change color in the air, especially in an atmosphere containing sulfur, it will be corroded and turn into a tea-brown blue-black, which has the problem of poor electrical contact. [0003] As one of methods for solving this problem, there is a surface treatment method. That is, the surface of the silver plating layer is treated with a treatment solution to prevent discoloration from deteriorating the appearance and increasing contact resistance. As a conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/00H01L33/60
CPCC23F11/149C23F11/165H01L33/60C23F11/10
Inventor 内田贵博大内高志
Owner JX NIPPON MINING & METALS CO LTD
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