Monovalent gold cyanide-free gold electroplating bath based on alkaloid compound coordination and application thereof

A cyanide-free gold plating and alkaloid technology, applied in the field of cyanide-free gold plating, can solve the problems of stress brittleness, unstable plating solution, and sulfur inclusions in the coating layer, and achieve the effects of avoiding sulfur inclusions, golden appearance and good bonding force.

Active Publication Date: 2018-08-24
XIAMEN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a monovalent gold cyanide-free gold plating solution based on alkaloid complex coordination and its application, solve the problems of thin gold electroplating, electroplating solution instability, Coating sulfur inclusions, stress embrittlement and other problems

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  • Monovalent gold cyanide-free gold electroplating bath based on alkaloid compound coordination and application thereof
  • Monovalent gold cyanide-free gold electroplating bath based on alkaloid compound coordination and application thereof
  • Monovalent gold cyanide-free gold electroplating bath based on alkaloid compound coordination and application thereof

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Embodiment Construction

[0030] A monovalent gold cyanide-free gold plating solution based on alkaloid complex coordination, with a pH of 8.5 to 12.7, including monovalent gold salt, complexing agent I, complexing agent II, pH buffer, wetting agent and additives;

[0031] The monovalent gold salt is a sodium sulfite solution containing monovalent gold, which is a concentrated solution. The mass concentration of monovalent gold ions in the concentrated solution is 10 to 100 g / L. After the concentrated solution is added to the electroplating solution, the electroplating solution The mass concentration of monovalent gold ions is 0.4-3.4 g / L.

[0032] At present, there is no solid medicine of sodium gold sulfite for sale on the market. Taking the mass concentration of monovalent gold ions as 10g / L as an example to configure the above concentrated solution, the steps are as follows:

[0033] ①In a 500mL beaker, add 20.8g of chloroauric acid (containing about 10g of gold) and 200mL of deionized water to di...

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Abstract

The invention discloses a monovalent gold cyanide-free gold electroplating bath based on alkaloid compound coordination and application thereof. The electroplating bath comprises monovalent gold salt,a coordination agent I, a coordination agent II, a pH buffering agent (used as conducting salt at the same time), a wetting agent and an additive, wherein sodium sulfite containing monovalent gold isused as main salt; sodium sulfite is used as the coordination agent I; alkaloid is used as the coordination agent II; a mixture of dipotassium phosphate, sodium tetraborate, citric acid and potassiumcitrate is used as the pH buffering agent (used as conducting salt at the same time); polyoxy organic matter is used as the wetting agent; and a heterocyclic organic compound is used as the additive.The cyanide-free gold electroplating bath is stable and is still clear and colorless after being placed for a long time, the replacement resistance is high, and the phenomenon of a replaced gold layer is avoided after a fresh nickel plate is arranged in the electroplating bath for 5 min; and the even-plating capacity is good, and under the rated electroplating conditions, an obtained gold coatingis good in bonding force with a substrate and bright and yellow in appearance.

Description

technical field [0001] The invention relates to the technical field of cyanide-free electroplating, in particular to a monovalent gold cyanide-free gold-plating solution based on complex coordination of alkaloids and its application. Background technique [0002] Gold is a golden yellow metal with low hardness, good ductility, high chemical stability, and excellent electrical and thermal conductivity. The electroplating gold process has been widely used in electrical appliances, connectors, printed circuit boards, integrated circuits and other electronic components as well as decoration and finishing fields. [0003] Common oxidation states of gold are trivalent and monovalent. In the process of electroreduction, trivalent gold first obtains two electrons to be reduced to monovalent gold, and then obtains one electron to become elemental gold; while monovalent gold obtains one electron, and is directly reduced to elemental gold without an intermediate step of electroreducti...

Claims

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Application Information

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IPC IPC(8): C25D3/48
CPCC25D3/48
Inventor 杨防祖金磊刘诚吴德印田中群
Owner XIAMEN UNIV
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