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Liquid palladium cleaning solution and method for removing metal impurities from liquid palladium

A technology of metal impurities and cleaning solution, which is applied in the field of palladium water cleaning solution and the removal of metal impurities in palladium water, which can solve problems such as pitting, missing plating of electroplating products, copper pollution, etc., and achieve the effect of avoiding copper pollution and being easy to handle

Inactive Publication Date: 2017-10-17
珠海市春生五金工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the stannous ions in the soluble stannous salts have strong reducibility, and the hexavalent chromium ions in the palladium water are reduced to trivalent chromium ions. The toxicity of trivalent chromium ions is lower than that of hexavalent chromium ions. Treatment; the main component of rust is iron oxide, and iron oxide reacts with acid to generate divalent iron ions, which easily form colloids and are easy to filter; copper impurities on the hanger fall into palladium water, and copper reacts with acid to form white precipitate Cuprous ions, easy to filter, avoid copper pollution in palladium water, effectively remove metal impurities in palladium water, and effectively solve electroplating defects such as missing plating and pitting of electroplating products due to the use of potions with high metal impurities for activation problem occurred

Method used

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  • Liquid palladium cleaning solution and method for removing metal impurities from liquid palladium
  • Liquid palladium cleaning solution and method for removing metal impurities from liquid palladium

Examples

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Effect test

Embodiment 1

[0018] 1. Preparation of palladium water cleaning solution

[0019] Dissolve acid in water, then add soluble palladium salt, add soluble stannous salt after dissolving to obtain palladium water cleaning solution a1, wherein acid is hydrochloric acid, the content of hydrochloric acid is 320g / L, soluble palladium salt is palladium chloride, chloride The content of palladium is 4.0×10 -4 g / L, the soluble stannous salt is stannous chloride, and the content of stannous chloride is 10g / L.

[0020] 2. The plastic electroplating process includes the following steps:

[0021] (1) Substrate pre-treatment two-color plastic (PC and ABS, ABS injection molding for electroless plating area, PC injection molding for non-chemical plating area): Put the two-color plastic into the degreasing liquid, which includes the following components: sodium hydroxide 1mol / L, 1mol / L sodium carbonate, and 0.1mol / L sodium dodecylsulfonate, soak for 5 minutes at 50°C, take it out and wash it with tap water. ...

Embodiment 2

[0030] Prepare palladium water cleaning solution a2 according to the method of Example 1. The difference is that the soluble palladium salt in the palladium water cleaning solution a2 is palladium sulfate, and the content of palladium sulfate is 4.2×10 -4 g / L, the acid is sulfuric acid, the content of sulfuric acid is 290g / L and the soluble stannous salt is stannous chloride, and the content of stannous chloride is 5g / L.

[0031] Clean the palladium water and prepare the plated part b2 according to the method of Example 1, the difference is that when the palladium water cleaning solution is added to the palladium water, the temperature rises to 55 ° C, and the soaking time is 5 hours under the condition of heat preservation.

Embodiment 3

[0033] Prepare palladium water cleaning solution a3 according to the method of Example 1. The difference is that the soluble palladium salt in palladium water cleaning solution a3 is palladium chloride, and the content of palladium chloride is 4.5×10 -4 g / L, the acid is hydrochloric acid, the content of hydrochloric acid is 260g / L and the soluble stannous salt is stannous chloride, and the content of stannous chloride is 0.5g / L.

[0034] Clean the palladium water and prepare the plated part b3 according to the method of Example 1, the difference is that the temperature rises to 56°C when the palladium water cleaning solution is added to the palladium water, and the soaking time is 5h under the condition of heat preservation.

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Abstract

Palladium water cleaning solution and method for removing metal impurities in palladium water. The method for removing metal impurities in palladium water provided by the invention is to add a palladium water cleaning solution into the palladium water, raise the temperature to 55-60° C., and keep it warm for 5 hours, wherein the palladium water cleaning solution contains soluble palladium salt, acid and soluble sub- For tin salt, the content of soluble palladium salt is 4.0×10‑4g / L~4.5×10‑4g / L, the content of acid is 260g / L~320g / L, and the content of soluble stannous salt is 0.5~10g / L; Using the above method, the palladium water cleaning solution is added to the palladium water, which can effectively remove the metal impurities in the palladium water under the reaction conditions, avoiding the palladium ion precipitation caused by too many impurities and causing the palladium water to fail to activate, and avoiding the use of metal impurities with high content. The activation of the potion will lead to the occurrence of poor electroplating phenomena such as missing plating and pitting of electroplating products.

Description

technical field [0001] The invention relates to the technical field of plastic electroplating, in particular to a palladium water cleaning solution and a method for removing metal impurities in palladium water. Background technique [0002] Plastic electroplating products have the advantages of light weight, good corrosion resistance, easy molding and metal organic solvent resistance, light resistance, metallic luster, thermal conductivity, electrical conductivity, electromagnetic shielding, and easy welding. They are used in automobiles, motorcycles, Widely used in hardware, electronics, communication and other industries. [0003] The key step in the electroplating of plastics and various non-metallic materials is activation. Colloidal palladium activation is the most widely used one. 2+ ) solution, after which the metal ions are quickly reduced to metal particles by divalent tin and are tightly adsorbed on the surface of the substrate. The purpose of activation is to ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/56
CPCC25D5/56
Inventor 梁天野王琼
Owner 珠海市春生五金工业有限公司
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