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Electrotinning tarnishing prevention treating agent and using method thereof

An anti-discoloration and treatment agent technology, which is applied in the field of surface treatment agents, can solve problems affecting the performance of components, unsatisfactory effects, and failure to meet environmental protection requirements, and achieve stable product performance and simple and convenient waste liquid treatment.

Inactive Publication Date: 2017-11-07
DOWMORGEN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the anti-discoloration treatment of electroplating tin is generally neutralized by trisodium phosphate, but the effect is not ideal, and the alkaline residue is not easy to clean, so as to affect the performance of components; some formulations use toxic heavy metal salts such as molybdate and environmental protection restricted substances such as nitrate, which cannot meet the requirements of environmental protection

Method used

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  • Electrotinning tarnishing prevention treating agent and using method thereof

Examples

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Effect test

Embodiment 1

[0016] The electroplating tin anti-tarnish treatment agent is configured, and the components of the electrotin tin anti-tarnish treatment agent are: 5ml / L phosphoric acid, 5g / L ethylenediaminetetramethylenephosphonic acid (edtmpA), and deionized water. Phosphoric acid is commercially available phosphoric acid with a content of 85%.

[0017] The treatment method is: immerse the electroplated tin after washing in 20°C electroplated tin anti-tarnish agent for 3 seconds, wash the acidic residue on the surface with hot pure water and dry it. Use the reflow soldering test to test the anti-discoloration effect, after 5 minutes of reflow soldering test at 265°C, it will not change color or tin flow.

Embodiment 2

[0019] The electroplating tin anti-tarnish treatment agent is configured, and the components of the electrotin tin anti-tarnish treatment agent are: 7ml / L phosphoric acid, 5g / L ethylenediamine tetramethylene phosphonic acid, and deionized water. Phosphoric acid is commercially available phosphoric acid with a content of 85%.

[0020] The treatment method is: soak the electroplated tin after washing in 30°C electroplated tin anti-tarnish agent for 30 seconds, wash the acidic residue on the surface with hot pure water and dry it. Use the reflow soldering test to test the anti-discoloration effect, after 5 minutes of reflow soldering test at 265°C, it will not change color or tin flow.

Embodiment 3

[0022] The electroplating tin anti-tarnish treatment agent is configured, and the components of the electrotin tin anti-tarnish treatment agent are: 10ml / L phosphoric acid, 5g / L ethylenediamine tetramethylene phosphonic acid, and deionized water. Phosphoric acid is commercially available phosphoric acid with a content of 85%.

[0023] The treatment method is: soak the electroplated tin after washing in water for 60 seconds in the electroplated tin anti-tarnish agent at 40°C, wash the acidic residue on the surface with hot pure water and dry it. Use the reflow soldering test to test the anti-discoloration effect, after 5 minutes of reflow soldering test at 265°C, it will not change color or tin flow.

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Abstract

The invention discloses an electrotinning tarnishing prevention treating agent and a using method thereof. The electrotinning tarnishing prevention treating agent is prepared from phosphoric acid, ethylenediamine tetramethylenephosphonic acid and deionized water. By means of the electrotinning tarnishing prevention treating agent and the using method thereof, an electrotinning layer can be effectively protected against oxidizing tarnishing and prevented from aging, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of surface treatment agents, in particular to an anti-discoloration treatment agent for electroplating tin and a use method thereof. Background technique [0002] Electronic components such as electronic connectors and semiconductor packages are tinned due to oxidation of the tin layer after electroplating tin, and electroplated tin is discolored and tin-flowed due to storage, high-temperature aging, baking and reflow soldering tests, which affects the components. The performance and appearance of the device, so the post-treatment process is generally carried out after tinning. [0003] At present, the anti-discoloration treatment of electroplating tin is generally neutralized by trisodium phosphate, but the effect is not ideal, and the alkaline residue is not easy to clean, so as to affect the performance of components; some formulations use toxic heavy metal salts such as molybdate And environmental prote...

Claims

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Application Information

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IPC IPC(8): C25D5/48
CPCC25D5/48
Inventor 冷传凯
Owner DOWMORGEN ELECTRONICS TECH
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