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Electroplating liquid of cyanide-free silver plated tin alloy and electroplating method thereof

A cyanide-free silver plating and electroplating solution technology, which is applied in the field of cyanide-free electroplating, can solve environmental threats and other problems, and achieve the effects of improved sensitivity, reasonable formula, good compactness and brightness

Inactive Publication Date: 2017-05-31
HUIZHOU LEADAO ELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main component of the plating solution used in the prior art is cyanide, but cyanide is a highly toxic substance, which poses a great threat to the environment no matter it is produced, stored, transported or used.

Method used

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  • Electroplating liquid of cyanide-free silver plated tin alloy and electroplating method thereof
  • Electroplating liquid of cyanide-free silver plated tin alloy and electroplating method thereof
  • Electroplating liquid of cyanide-free silver plated tin alloy and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of electroplating solution of cyanide-free silver plating tin alloy, comprising mass concentration is 25g / L silver methanesulfonate, 20g / L tin methanesulfonate, 15g / L carbene sulfonate, 63g / L citric acid, 20g / L Pyrophosphoric acid, 0.5mL / L phytic acid. The pH value of the electroplating solution is controlled at 7.

[0025] A kind of electroplating method of the electroplating solution of cyanide-free silver-plated tin alloy, comprises the following steps:

[0026] S1. Prepare the above-mentioned electroplating solution, and adjust the temperature of the electroplating solution to be 45° C.;

[0027] S2. Use the silver plate as the anode and the piece to be plated as the cathode, apply a single pulse power supply between the anode and the cathode, the pulse width of the single pulse power supply is 120ms, the duty cycle is 55%, and the average pulse current density of the cathode is controlled It is 2.5 ASD; the cathode is moved and stirred, and the electroplat...

Embodiment 2

[0030] A kind of electroplating solution of cyanide-free silver plating tin alloy, comprising mass concentration is 55g / L silver methanesulfonate, 15g / L tin methanesulfonate 20g / L carbene sulfonate, 63g / L citric acid, 20g / L coke Phosphoric acid, 10.5mL / L phytic acid. The pH value of the electroplating solution is controlled at 7.

[0031] A kind of electroplating method of the electroplating solution of cyanide-free silver-plated tin alloy, comprises the following steps:

[0032] S1. Prepare the above-mentioned electroplating solution, and adjust the temperature of the electroplating solution to be 45° C.;

[0033] S2. Use the silver plate as the anode and the piece to be plated as the cathode, apply a single pulse power supply between the anode and the cathode, the pulse width of the single pulse power supply is 120ms, the duty cycle is 55%, and the average pulse current density of the cathode is controlled It is 2.5 ASD; the cathode is moved and stirred, and the electropla...

Embodiment 3

[0036] A kind of electroplating solution of cyanide-free silver plating tin alloy, comprising mass concentration is 45g / L silver methanesulfonate, 12g / L tin methanesulfonate, 25g / L carbene sulfonate, 13g / L citric acid, 35g / L Pyrophosphoric acid, 0.5mL / L phytic acid. The pH value of the electroplating solution is controlled at 7.

[0037] A kind of electroplating method of the electroplating solution of cyanide-free silver-plated tin alloy, comprises the following steps:

[0038] S1. Prepare the above-mentioned electroplating solution, and adjust the temperature of the electroplating solution to be 45° C.;

[0039] S2. Use the silver plate as the anode and the piece to be plated as the cathode, apply a single pulse power supply between the anode and the cathode, the pulse width of the single pulse power supply is 120ms, the duty cycle is 55%, and the average pulse current density of the cathode is controlled It is 2.5 ASD; the cathode is moved and stirred, and the electroplat...

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Abstract

The invention provides electroplating liquid of a cyanide-free silver plated tin alloy and an electroplating method. Silver methane sulfonate and tin methane sulfonate are used as main salt of a silver plated tin alloy; carving sulfonic acid is used as a complexing agent; other additive components are compounded for improving the effect; cyanide-free electroplating silver tin alloy solution contains no cyanide, is free of poison and harm to environments and human bodies, is reasonable in formula, and is excellent in stability; pulse electroplating is used during electroplating, so that such problems as high plating layer strain and brittleness and weak binding force are effectively solved, and a plating layer with good binding performance with a basal body, low strain and good compactness and brightness is obtained; the obtained silver plated tin alloy layer is suitable for application of reflecting layers, high electric conducting layers and brazing plating layers in the fields of photoelectricity and microelectronics; and the formed plating layer can improve the microelectronic packing electric conductivity and reliability, and largely reduces the signal distortion caused by circuit resistance.

Description

technical field [0001] The invention belongs to the technical field of cyanide-free electroplating, and in particular relates to a cyanide-free electroplating solution for silver-tin alloy plating and an electroplating method thereof. Background technique [0002] Ag-Sn eutectic alloy has good thermal conductivity, electrical conductivity, wettability, corrosion resistance, creep resistance [0003] It is widely used in the packaging of microelectronic devices, the connection of chips and circuit substrates, and the hermetic packaging of high-reliability circuits. [0004] The main component of the plating solution used in the prior art is cyanide, but cyanide is a highly toxic substance, which poses a great threat to the environment no matter it is produced, stored, transported or used. As early as 2003, my country had requested to stop the cyanide electroplating process. The National Development and Reform Commission announced the industrial structure adjustment guidance ...

Claims

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Application Information

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IPC IPC(8): C25D3/64C25D5/18
CPCC25D3/64C25D5/18
Inventor 崔皓博黄兴桥
Owner HUIZHOU LEADAO ELECTRONICS MATERIAL
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