Ultralow-concentration copper pyrophosphate cooper preplating tank liquor and preparation method thereof

A copper pyrophosphate, ultra-low concentration technology, applied in the field of electroplating solution, can solve the problems of inability to repair, difficult to repair, low success rate of priming, etc., and achieve the effect of solving weak bonding, good bonding strength, and improving bonding force

Active Publication Date: 2015-09-23
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a technology of first plating nickel on steel parts and then tin-bronze plating. However, the success rate of nickel plating is low and the repair is not easy. Once repair is required, the nickel on the substrate is not easy to fade away, making it impossible to repair.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 prepares ultra-low concentration copper pyrophosphate pre-plating copper bath solution

[0016] Preparation of electroplating solution for pre-copper plating of iron and steel parts--ultra-low concentration copper pyrophosphate pre-plating copper bath, its formula is: copper pyrophosphate (Cu 2 P 2 o 7 , industrial pure): (1.5~2.5) g / L; potassium pyrophosphate (K 4 P 2 o 7 , industrial pure): (200-250) g / L; triethanolamine (industrial pure): (5-10) g / L.

[0017] The preparation method is as follows:

[0018] 1) Add potassium pyrophosphate into a small amount of deionized water, and stir while adding to fully dissolve;

[0019] 2) Add copper pyrophosphate and triethanolamine to the solution in step 1), stir evenly, and then add deionized water to the specified concentration.

Embodiment 2

[0020] Embodiment 2 prepares cyanide-free electroplating tin-bronze electroplating solution

[0021] Prepare the electroplating solution for cyanide-free electroplating tin bronze after the pretreatment, and the electroplating solution formula is:

[0022] Cu 2+ (from copper pyrophosphate Cu 2 P 2 o 7 , industrial pure): (12~17)g / L;

[0023] Potassium pyrophosphate (K 4 P 2 o 7 , industrial pure): (240~280)g / L;

[0024] sn 2+ (derived from stannous pyrophosphate Sn 2 P 2 o 7 , industrial pure): (1.5~2.5)g / L;

[0025] Disodium hydrogen phosphate (Na 2 HPO 4 , commercially pure) or dipotassium hydrogen phosphate (K 2 HPO 4 , industrial pure): (30~50)g / L;

[0026] Sodium citrate (Na 3 C 6 h 5 o 7 , industrial pure): (5 ~ 10) g / L;

[0027] Nitrilotriacetic acid (industrial pure): (30-40) g / L;

[0028] The preparation proceeds as follows:

[0029] 1) Dissolve the calculated amount of potassium pyrophosphate and half of the amount of disodium hydrogen phospha...

Embodiment 3

[0035] Embodiment 3 iron and steel parts cyanide-free electroplating tin bronze

[0036] Select the sample: take 10# steel sheet as the test piece 1, the specification is 120mm (length) × 60mm (width) × 3-5mm (thickness), two plane grinding, roughness Ra≤0.8um.

[0037] 1. To perform cyanide-free electroplating tin bronze on test piece 1, follow the steps below:

[0038] 1. Degrease and clean the test piece 1, and follow the steps below:

[0039] a. Use gasoline and other organic solvents to scrub the oil stains on the entire surface of the test piece 1 and then dry it.

[0040] b. Test piece 1 is soaked in an aqueous solution of special metal degreasing powder for 3 minutes, then wiped to degrease, and washed with flowing tap water.

[0041] c. Immerse the test piece 1 in 8% hydrochloric acid aqueous solution, pickle it for 5 minutes, and wash it with flowing tap water.

[0042] d. Immerse the test piece 1 in 5% sulfuric acid aqueous solution, activate it for 5 minutes, an...

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PUM

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Abstract

The invention discloses ultralow-concentration copper pyrophosphate cooper preplating tank liquor. The ultralow-concentration copper pyrophosphate cooper preplating tank liquor comprises 1.5 g/L-2.5 g/L of copper pyrophosphate, 200 g/L-250 g/L of potassium pyrophosphate and 5 g/L-10 g/L of triethanolamine. A preparation method comprises the following steps that 1, the triethanolamine is added into water and is stirred and dissolved; 2, the copper pyrophosphate and the triethanolamine are added into a solution in the step 1 to be stirred, and volume metering is carried out. The ultralow-concentration copper pyrophosphate cooper preplating tank liquor is adopted for carrying out cooper preplating bottoming treatment on steel parts to be plated, the situation that in the formal electroplating process, the steel parts enter pyrophosphate system electroplating liquid to generate copper replacement is avoided, the binding force of a plating layer and a steel base body is improved, the bonding strength of the tin bronze plating layer and the steel base body is good, and the problem that bonding of a plating layer and a base body in the prior is unfirm is solved.

Description

technical field [0001] The invention relates to an electroplating solution, in particular to an ultra-low-concentration copper pyrophosphate pre-plating copper bath solution used as a primer for tin-bronze plating of iron and steel parts and a preparation method thereof. Background technique [0002] Copper-tin alloy is commonly known as tin bronze. Electroplated tin bronze coating is widely used in light industry, instrumentation, machinery, communication, household appliances, handicraft and other industrial sectors. It is the most widely used and largest-scale alloy plating in my country. [0003] For a long time, cyanide and hydroxide are generally used as complexing agents in tin-bronze electroplating baths. Copper complexes with cyanide in monovalent form to form a copper-cyanide complex, and tin complexes with sodium hydroxide in tetravalent form. Therefore, the plating solution is stable, the dispersion performance is good, the maintenance and operation are convenien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38C25D5/00
Inventor 冀庆康陈才科
Owner CHONGQING YUEJIN MACHINERY
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