High-speed bright electroplating additives and electroplating solutions

Abstract

The invention discloses a high-speed bright electroplating additive and an electroplating solution, wherein the additive comprises: 8-10wt% of a dispersant, 2-5wt% of a brightener, 1-3wt% of an auxiliary brightener, 4-10wt% of a solvent, 1-3wt% of a grain refiner, 1-3wt% of a stabilizer and the balance of deionized water. The additive of the invention can meet the operating requirements of high-current electroplating, has extremely high electroplating efficiency, and has good stability and environmental protection.

Description

Technical Field

[0001] The invention relates to electroplating technology, in particular to a high-speed bright electroplating additive and an electroplating solution. Background Art

[0002] Because tin has the advantages of corrosion resistance, discoloration resistance, non-toxicity, easy soldering, softness, low melting point and good ductility, it is generally used as a coating material on the surface of electronic components. The specific reaction principle is that tin is used as the anode and the electronic components are used as the cathode. Two electrochemical reactions occur in a certain electrolyte solution:

[0003] Anode: Sn-2e - →Sn 2+ (Dissolution process of tin anode),

[0004] Cathode: Sn 2+ +2e - →Sn (film deposition process on chip components).

[0005] At present, all bright tinning in the lead frame electroplating tinning market in the field of packaging and testing is mainly carried out using rack plating line equipment, which is complicated to operate, requires more manpower, and has messy on-site management. In addition, as more and more companies begin to use high-speed electroplating equipment for electroplating, many rack plating lines are eliminated, and the demand for bright tinning using high-speed lines is increasing. The traditional bright tinning solution is carried out on the rack plating line, and its current density is relatively low. Usually, the current density can only reach 1-5ASD, which cannot meet the needs of high-speed electroplating lines (the current density is required to reach 15-25ASD).

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a high-speed bright electroplating additive and an electroplating solution, which can meet the operational requirements of high-current electroplating, have extremely high electroplating efficiency, and have good stability and environmental protection.

[0008] To achieve the above objectives, an embodiment of the present invention provides a high-speed bright electroplating additive, comprising: 8-10wt% of a dispersant, 2-5wt% of a brightener, 1-3wt% of an auxiliary brightener, 4-10wt% of a solvent, 1-3wt% of a grain refiner, 1-3wt% of a stabilizer and the remainder of deionized water.

[0009] In one or more embodiments of the present invention, the dispersant is selected from isomeric alcohol polyoxyethylene ether EH-9, naphthol polyoxyethylene ether BNO12, and nonylphenol polyoxyethylene ether NP-10, preferably isomeric alcohol polyoxyethylene ether EH-9.

[0010] In one or more embodiments of the present invention, the brightener is selected from benzalkyne acetone, benzaldehyde, and o-chlorobenzaldehyde, preferably benzalkyne acetone.

[0011] In one or more embodiments of the present invention, the auxiliary brightener is selected from formaldehyde, acetaldehyde, and glutaraldehyde, preferably glutaraldehyde.

[0012] In one or more embodiments of the present invention, the grain refiner is isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520.

[0013] In one or more embodiments of the present invention, the solvent is selected from methanol, ethanol, and isopropanol. Preferably, the solvent is isopropanol.

[0014] In one or more embodiments of the present invention, the stabilizer is selected from catechol, hydroquinone, vitamin E, and phytic acid. Preferably, the stabilizer is catechol.

[0015] In one or more embodiments of the present invention, the electroplating solution includes the high-speed bright electroplating additive as described above.

[0016] Brightener can mainly make the coating crystallize finely, smooth and bright. Auxiliary brightener is to enhance the effect of the main brightener and make the coating brighter. Grain refiner can change the crystallization state of the coating, refine the grains and make the coating dense. Dispersant is to better disperse the brightener to the surface of the workpiece during the electroplating process, so that the overall brightness of the workpiece surface is more consistent. Solvent is mainly used to dissolve brightener. The main function of stabilizer is anti-oxidation, which prevents the plating solution from oxidizing and becoming turbid during use. The addition of various components in high-speed bright tin plating plays a coordinated role, and none of them can be missing.

[0017] Compared with the prior art, the high-speed bright electroplating additive and electroplating solution according to the embodiment of the present invention can increase the current density of tin electroplating to 25ASD without burning, greatly speeding up the electroplating efficiency, and has good oxidation resistance, is easy to degrade, and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a photo of an electroplated product according to an embodiment of the present invention;

[0019] Figure 2 is a photo of an electroplated product according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The specific implementation modes of the present invention are described in detail below in conjunction with the embodiments, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0021] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0022] Among them, isomeric alcohol polyoxyethylene ether EH-9 is provided by Dow Chemical, and benzyl acetone and isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520 are provided by Hebei Jinri Chemical Co., Ltd.

[0023] Example 1 (taking 1 liter of additive as an example):

[0024] The configuration of the high-speed bright pure tin electroplating additive in this embodiment is:

[0025] First, weigh 40 grams of isopropanol according to the ratio;

[0026] While stirring, add 20 grams of benzyl acetone according to the ratio and stir evenly;

[0027] While stirring, add 80 grams of isomeric alcohol polyoxyethylene ether EH-9 at a uniform speed according to the ratio, and continue stirring for 5-10 minutes;

[0028] While stirring, add 10 g of glutaraldehyde according to the ratio and stir evenly;

[0029] While stirring, add 10g of TS-3520 according to the ratio and stir evenly;

[0030] While stirring, add 10 grams of catechol according to the ratio and continue stirring until it is completely dissolved;

[0031] Add water to required amount and stir well when finished.

[0032] The Hull cell electroplating process is: 150 g / L of methanesulfonic acid (70%), 200 g / L of tin methanesulfonate (stock solution concentration 300 g / L), 50 ml / L of the above additives, temperature 25 degrees Celsius, current 5 amperes, time 1 minute.

[0033] from Figure 1 It can be seen that under the condition of 5 amperes for 1 minute, the Hull cell sheet is bright overall, with no burnt areas in the high-voltage area, and can meet the high current density requirements for high-speed lines.

[0034] Example 2 (taking 1 liter of additive as an example):

[0035] The configuration of the high-speed bright pure tin electroplating additive in this embodiment is:

[0036] First, weigh 100 grams of isopropanol according to the ratio;

[0037] While stirring, add 50 grams of benzyl acetone according to the ratio and stir evenly;

[0038] While stirring, add 100 g of isomeric alcohol polyoxyethylene ether EH-9 at a uniform rate according to the ratio, and continue stirring for 5-10 minutes;

[0039] While stirring, add 30 g of pentanediol according to the ratio and stir evenly;

[0040] While stirring, add 30g of TS-3520 according to the ratio and stir evenly;

[0041] While stirring, add 30 grams of catechol according to the ratio and continue stirring until it is completely dissolved;

[0042] Add water to required amount and stir well when finished.

[0043] The Hull cell electroplating process is: 150 g / L of methanesulfonic acid (70%), 200 g / L of tin methanesulfonate (stock solution concentration 300 g / L), 50 ml / L of the above additives, temperature 25 degrees Celsius, current 5 amperes, time 1 minute.

[0044] from Figure 2 It can be seen that under the condition of 5 amperes for 1 minute, the Hull cell sheet is bright overall, with no burnt areas in the high-voltage area, and can meet the high current density requirements for high-speed lines.

[0045] Example 3

[0046] The high-speed bright electroplating additive of this embodiment includes: 8wt% of naphthol polyoxyethylene ether BNO12, 2wt% of benzaldehyde, 1wt% of formaldehyde, 4wt% of ethanol, 1wt% of isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520, 1wt% of catechol and the balance of deionized water. The additive preparation process is shown in Example 1.

[0047] The sample of this embodiment was subjected to 10 repeated electroplating experiments. Under the condition of 5 amperes for 1 minute, the Hull cell sheet was bright as a whole, with no burning in the high area, and could meet the high current density requirements for high-speed lines.

[0048] Example 4

[0049] The high-speed bright electroplating additive of this embodiment includes: 9wt% nonylphenol polyoxyethylene ether NP-10, 3wt% o-chlorobenzaldehyde, 2wt% acetaldehyde, 6wt% methanol, 2wt% isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520, 2wt% hydroquinone and the balance deionized water. The additive preparation process is shown in Example 1.

[0050] The sample of this embodiment was subjected to 10 repeated electroplating experiments. Under the condition of 5 amperes for 1 minute, the Hull cell sheet was bright as a whole, with no burning in the high area, and could meet the high current density requirements for high-speed lines.

[0051] Example 5

[0052] The high-speed bright electroplating additive of this embodiment includes: 10wt% of isomeric alcohol polyoxyethylene ether EH-9, 4wt% of benzyl acetone, 3wt% of glutaraldehyde, 8wt% of isopropyl alcohol, 3wt% of isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520, 3wt% of vitamin E and the balance of deionized water. The additive preparation process is shown in Example 1.

[0053] The sample of this embodiment was subjected to 10 repeated electroplating experiments. Under the condition of 5 amperes for 1 minute, the Hull cell sheet was bright as a whole, with no burning in the high area, and could meet the high current density requirements for high-speed lines.

[0054] Example 6

[0055] The high-speed bright electroplating additive of this embodiment includes: 8.5wt% of isomeric alcohol polyoxyethylene ether EH-9 and naphthol polyoxyethylene ether BNO12 in a volume ratio of 1:1, 5wt% of benzalkylacetone and benzaldehyde in a volume ratio of 1:2, 1.5wt% of formaldehyde and glutaraldehyde in a volume ratio of 1:2, 10wt% of ethanol and isopropanol in a volume ratio of 1:3, 1.5wt% of isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520, 1.5wt% of phytic acid and the balance of deionized water. The additive preparation process is shown in Example 1.

[0056] The sample of this embodiment was subjected to 10 repeated electroplating experiments. Under the condition of 5 amperes for 1 minute, the Hull cell sheet was bright as a whole, with no burning in the high area, and could meet the high current density requirements for high-speed lines.

[0057] Example 7

[0058] The high-speed bright electroplating additive of this embodiment includes: 9.5wt% of isomeric alcohol polyoxyethylene ether EH-9, naphthol polyoxyethylene ether BNO12 and nonylphenol polyoxyethylene ether NP-10 with a volume ratio of 1:2:3, 3.5wt% of benzalketone, benzaldehyde, and o-chlorobenzaldehyde with a volume ratio of 1:1:1, 2.5wt% of formaldehyde, acetaldehyde and glutaraldehyde with a volume ratio of 2:3:4, 7wt% of methanol, ethanol and isopropanol with a volume ratio of 1:2:3, 2.5wt% of isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520, 2.5wt% of vitamin E and phytic acid with a mass ratio of 1:1, and the remainder of deionized water. The additive preparation process is shown in Example 1.

[0059] The sample of this embodiment was subjected to 10 repeated electroplating experiments. Under the condition of 5 amperes for 1 minute, the Hull cell sheet was bright as a whole, with no burning in the high area, and could meet the high current density requirements for high-speed lines.

[0060] Comparative Example 1

[0061] The only difference between this comparative example and Example 1 is that there is no isopropyl alcohol. The sample of this comparative example is turbid, and after 10 repeated electroplating experiments, the Hull cell sheet corroded gray and burned in a large area under the condition of 5 amperes for 1 minute, which cannot meet the high current density requirements for high-speed lines.

[0062] Comparative Example 2

[0063] The only difference between this comparative example and Example 2 is that there is no benzalkyneacetone. After 10 repeated electroplating experiments, the Hull cell of the comparative example sample was dark under the condition of 5 amperes for 1 minute, which could not meet the high current density requirement for high-speed lines.

[0064] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An electroplating solution comprising 50 ml / L of a high-speed bright pure tin electroplating additive, 150 g / L of 70% methanesulfonic acid, and 200 g / L of a 300 g / L tin methanesulfonate stock solution, wherein the high-speed bright pure tin electroplating additive comprises: 8-10wt% of a dispersant, 2-5wt% of a brightener, the brightener is selected from benzalkyne acetone, benzaldehyde or o-chlorobenzaldehyde, 1-3wt% of an auxiliary brightener, the auxiliary brightener is selected from formaldehyde, acetaldehyde or glutaraldehyde, 4-10wt% of a solvent, the solvent is isopropanol, 1-3wt% of a grain refiner, 1-3wt% of a stabilizer and the balance of deionized water, the stabilizer is catechol, the dispersant is selected from isomeric alcohol polyoxyethylene ether EH-9, naphthol polyoxyethylene ether BNO12, nonylphenol polyoxyethylene ether NP-10, and the grain refiner is isomeric alkylphenol polyoxyethylene polyoxypropylene ether TS-3520.

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