Steel part cyanide-free electroplating tin bronze electroplating liquid and preparation method thereof

A technology of tin electroplating and electroplating solution, which is applied in the field of cyanide-free electroplating tin-bronze electroplating solution for iron and steel parts and its preparation. It can solve the problems of inability to repair, low success rate of priming, and difficult repair, etc., and achieves low cost and good bonding strength. , Improve the effect of binding force

Inactive 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 prepares ultra-low concentration copper pyrophosphate pre-plating copper bath solution

[0022] Prepare the electroplating solution for pre-copper plating treatment of iron and steel parts--ultra-low concentration copper pyrophosphate pre-plating bath solution, the preparation method is as follows:

[0023] Add potassium pyrophosphate into a small amount of deionized water, stir while adding to fully dissolve, then add copper pyrophosphate and triethanolamine, stir evenly, and then add deionized water to the specified concentration. The ratio of each compound 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;

Embodiment 2

[0024] Embodiment 2 prepares iron and steel parts cyanide-free electroplating tin-bronze electroplating solution

[0025] Prepare the electroplating solution for cyanide-free electroplating tin-bronze after the pretreatment, and the formula of the cyanide-free electroplating tin-bronze electroplating solution for iron and steel parts is:

[0026] Cu 2+ (from copper pyrophosphate Cu 2 P 2 o 7 , industrial pure): (12~17)g / L;

[0027] Potassium pyrophosphate (K 4 P 2 o 7 , industrial pure): (240~280)g / L;

[0028] sn 2+ (derived from stannous pyrophosphate Sn 2 P 2 o 7 , industrial pure): (1.5~2.5)g / L;

[0029] Disodium hydrogen phosphate (Na 2 HPO 4 , industrial pure): (30~50)g / L;

[0030] Sodium citrate (Na 3 C 6 h 5 o 7 , industrial pure): (5 ~ 10) g / L;

[0031] Nitrilotriacetic acid (industrial pure): (30-40) g / L;

[0032] The preparation proceeds as follows:

[0033] 1) Dissolve the calculated amount of potassium pyrophosphate and half of the amount of d...

Embodiment 3

[0039] Embodiment 3 iron and steel parts cyanide-free electroplating tin bronze

[0040] 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.

[0041] 1. To perform cyanide-free electroplating tin bronze on test piece 1, follow the steps below:

[0042] 1. Degrease and clean the test piece 1, and follow the steps below:

[0043] 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.

[0044] 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.

[0045] c. Immerse the test piece 1 in 8% hydrochloric acid aqueous solution, pickle it for 5 minutes, and wash it with flowing tap water.

[0046] 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 steel part cyanide-free electroplating tin bronze electroplating liquid. Components comprise 12 g/L-17 g/L of Cu<2+>, 240 g/L-280 g/L of potassium pyrophosphate, 1.5 g/L-2.5 g/L of Sn<2+>, 30 g/L-50 g/L of disodium hydrogen phosphate or dipotassium phosphate, 5 g/L-10 g/L of sodium citrate and 30 g/L-40 g/L of nitrilotriacetic acid. A preparation method of the steel part cyanide-free electroplating tin bronze electroplating liquid comprises the following steps that 1, the potassium pyrophosphate and one half of the disodium hydrogen phosphate or dipotassium phosphate are dissolved in hot water; 2, the potassium pyrophosphate is dissolved; 3, the nitrilotriacetic acid is dissolved through sodium hydroxide and added into mixed liquid, and the other half of the disodium hydrogen phosphate or dipotassium phosphate is added; 4, the pH value of a solution is adjusted to 8.3-8.8, and a plating solution is filtered; 5, a pure cooper plate is adopted as an anode of the plating solution, a waste steel plate is adopted as a cathode of the plating solution, an electrolytic tank is formed, electrolysis is firstly carried out for three to four hours, and then stannous pyrophosphate is added with stirring while electrolysis is carried out.

Description

technical field [0001] The invention relates to an electroplating solution, in particular to a cyanide-free tin-bronze electroplating solution for 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 convenient, the tin bronze plating layer is uniform and fine, and the compositi...

Claims

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Application Information

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IPC IPC(8): C25D3/58
Inventor 冀庆康陈才科
Owner CHONGQING YUEJIN MACHINERY
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