A water-soluble solderable nickel protectant

A water-soluble, protective agent technology, applied in liquid chemical plating, coating, metal material coating process, etc., can solve the problems of easy residual corrosion of acid ions, poor weldability, complicated process, etc., to achieve no residual corrosion hidden danger Effect

Active Publication Date: 2020-07-03
TANTZ ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In order to solve the problems of poor solderability caused by self-passivation of nickel coating, traditional dilute acid immersion limited to fresh nickel surface, cumbersome process, easy residual corrosion of acid radical ions, etc., the invention provides a water-soluble solderable nickel protectant, Through a one-time soaking process, the simultaneous treatment of stripping off the oxide film and shielding protective film is realized. At the same time, the reductive weak acid ion also has the function of reducing nickel oxide to simple nickel, without residual corrosion hazards, and it is truly water-free.

Method used

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  • A water-soluble solderable nickel protectant
  • A water-soluble solderable nickel protectant
  • A water-soluble solderable nickel protectant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 solderable nickel protective agent

[0044] Table 1

[0045]

[0046] Table 2

[0047]

[0048]

[0049] According to the 8 formulations in Table 1 and Table 2, concentrates were prepared respectively, and diluted with pure water to a concentration of 5% to make a working solution.

Embodiment 2

[0050] Embodiment 2 Solder performance test

[0051] Objective: To test the solder performance of fresh and long-term nickel coatings treated with different formulations by using the simple immersion tin method commonly used in the industry.

[0052] Test workpiece samples:

[0053] Sample 1: Fresh nickel surface. Nickel-plated solder feet on copper, electroplating process, nickel layer thickness 1.0-2μm (40-80μ").

[0054] Sample 2: long-term nickel surface. Nickel-plated solder feet on copper, electroplating process, nickel layer thickness 1.0-2μm (40-80μ"). Open and place in the air for 3 months.

[0055] Solderability protection treatment conditions:

[0056] Heat the 8 formula working solutions in Example 1 to 50°C, soak the fresh nickel surface directly in the 8 formula working solutions for 5 seconds, take out the hot air and dry it; the long-standing nickel surface adopts the cathode electrolysis auxiliary process, and the workpiece is used as the cathode , stainl...

Embodiment 3

[0059] Embodiment 3 nickel coating corrosion resistance test

[0060] Objective: To test the corrosion resistance and anti-oxidation ability of nickel coatings treated with different formulations by neutral salt spray test.

[0061] Test workpiece samples:

[0062] Sample 1: electroless nickel plating on copper material, the thickness of the nickel layer is 2 μm (80 μ”).

[0063] Sample 2: Electroplated nickel on iron material, the thickness of the nickel layer is 2.5 μm (100 μ”).

[0064] Solderability protection treatment conditions: heat the 8 formula working solutions in Example 1 to 55°C, soak samples 1 and 2 for 10 seconds, take out the hot air and dry them.

[0065] At the same time, a blank control group was set, that is, no solderability protection treatment was performed.

[0066] The test workpiece sample is subjected to neutral salt spray test after being treated by the present invention, and the specific test method refers to the test standard of GB / T10125-2012...

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Abstract

The invention discloses a water-soluble weldable nickel protective agent. The water-soluble weldable nickel protective agent contains fatty alcohol and quinoline carboxylic acid, wherein the molar ratio of the fatty alcohol to the quinoline carboxylic acid is 1:1-3:1. According to the water-soluble weldable nickel protective agent, a combination of the fatty alcohol and the quinoline carboxylic acid is adopted as the protective agent for weldable nickel for the first time, on one hand, the quinoline carboxylic acid can strip off an oxidation film layer of the nickel, on the other hand, the quinoline carboxylic acid and the fatty alcohol are subjected to esterification reaction so as to form a compact protective film on the surface of a nickel layer so as to block the oxidation of the nickel, meanwhile, the protective film can reduce nickel oxide into elemental nickel, and stripping of the oxidation film layer can be accelerated. The protective agent has the advantages that corrosion inhibition, corrosion prevention, reduction and welding promotion are integrated into a whole, synchronous treatment of stripping the oxidation film and shielding the reductive protective film can be realized, no residual corrosion hidden danger exists, water washing is actually not needed, the protective film can be automatically decomposed in the tin soldering process, and tin soldering can be ensured to be carried out smoothly.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of electronic components, in particular to a water-soluble solderable nickel protectant. Background technique [0002] With the market demand for portable and multi-functional electronic products, installation (assembly) technology and circuit board (PCB) must continue to move towards high density. Since the pads of the PCB are made of copper, an oxide layer is easily formed on the copper surface, which not only has high resistance and even insulation, but also cannot be soldered. Therefore, the surface coating (plating) layer must be coated / plated on the copper pad of the PCB for protection. [0003] Nickel plating is a commonly used metal plating in electronic products. The use of solderable nickel plating on electronic components has the following functions: to provide a solderable surface layer on non-solderable substrates; to prevent the substrate from penetrating into the barrier...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/10C23G1/06C23C22/58C25F1/04C23C18/32C25D5/48
CPCC23C18/1689C23C18/32C23C22/58C23G1/06C23G1/10C25D5/48C25F1/04
Inventor 吴小明刘宏伍继柱王朝霞刘倩源
Owner TANTZ ENVIRONMENTAL TECH
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