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Corrosion resistant nickel-tin alloy plating solution and electroplating technology thereof

A tin alloy and corrosion resistance technology, applied in the field of corrosion-resistant nickel-tin alloy plating solution and its electroplating process, can solve the problems of environmental pollution and poor corrosion resistance of the coating, and achieve strong wear resistance and deposition. High speed and high microhardness effect

Inactive Publication Date: 2009-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Ni-Sn alloys are widely used and have good prospects, traditional electroplating Ni-Sn alloy plating solutions often use fluoride systems, cyanide systems and pyrophosphate systems, which seriously pollute the environment
[0004] Disclosed in Chinese patent CN1053453A is a kind of electroplating gun color (nickel-tin alloy) case material process method, its weak point is that the coating is a decorative coating, so the corrosion resistance of the coating is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] NiSO 4 ·6H 2 O 30g,

[0029] SnCl 4 ·3H 2 O 10g,

[0030] Conductive salt 80g,

[0031] Compound hydroxycarboxylic acid complexing agent 30g,

[0032] Saccharin 0.8g,

[0033] The remainder is water;

[0034] The pH value of the solution is adjusted to 1.5 with sulfuric acid and sodium hydroxide, and the complex hydroxycarboxylic acid complexing agent is composed of the following components by weight percentage: 60% lactic acid, 40% citric acid or potassium citrate or sodium citrate . The conductive salt is anhydrous sodium sulfate or anhydrous potassium sulfate.

[0035] The electroplating process method is:

[0036] Cathode current density 2A / dm 2

[0037] Bath temperature 40°C

[0038] Anode Ruthenium titanium anode (RuO 2 / TiO 2 )

[0039] Coating performance index

[0040] Ni 96.0wt%

[0041] Sn 4.0wt%

[0042] Microhardness 640HV

[0043] Artificial seawater immersion weight loss* 1.0×10 -2 mg / (cm 2 d)

[0044] Deposition speed 10μm / h

Embodiment 2

[0046] NiSO 4 ·6H 2 O 50g,

[0047] SnCl 4 ·3H 2 O 30g,

[0048] Conductive salt 100g,

[0049] Complex hydroxycarboxylic acid complexing agent 50g,

[0050] Saccharin 0.8g,

[0051] The balance is water, the pH value of the solution is 2.0, and the complex hydroxycarboxylic acid complexing agent is composed of the following components by weight percentage: 40% lactic acid, 60% citric acid or potassium citrate or sodium citrate . The conductive salt is anhydrous sodium sulfate or anhydrous potassium sulfate.

[0052] The electroplating process method is:

[0053] Cathode current density 6A / dm 2

[0054] Bath temperature 55°C

[0055] Anode Ruthenium titanium anode (RuO 2 / TiO 2 )

[0056] Coating performance index

[0057] Ni 92.3wt%

[0058] Sn 7.7wt%

[0059] Microhardness 720HV

[0060] Artificial seawater immersion weight loss* 7.5×10 -3 mg / (cm 2 d)

[0061] Deposition speed 18μm / h

Embodiment 3

[0063] NiSO 4 ·6H 2 O 50g,

[0064] SnCl 4 ·3H 2 O 30g,

[0065]Conductive salt 110g,

[0066] Complex hydroxycarboxylic acid complexing agent 50g,

[0067] Saccharin 0.8g, balance is water, the pH value of described solution is 2.0, and described compound hydroxycarboxylic acid complexing agent is made up of following components by weight percentage: lactic acid 50%, citric acid or potassium citrate or citric acid Sodium is 50%. The conductive salt is anhydrous sodium sulfate or anhydrous potassium sulfate.

[0068] The electroplating process method is:

[0069] Cathode current density 6A / dm 2

[0070] Bath temperature 50°C

[0071] Anode Ruthenium titanium anode (RuO 2 / TiO 2 )

[0072] Coating performance index

[0073] Ni 81.5wt%

[0074] Sn 18.5wt%

[0075] Microhardness 800HV

[0076] Artificial seawater immersion weight loss* 9.0×10 -3 mg / (cm 2 d)

[0077] Deposition speed 20μm / h

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Abstract

The invention relates to a corrosion resistant nickel-tin alloy plating solution and electroplating technology thereof. The nickel-tin alloy plating solution comprises the following components: NiSO4.6H2O, SnC4.3H2O, conducting salt, composite hydroxycarboxylic acid complexing agent and saccharine; the technology conditions include: cathode current density: 2 to 10 A / dm[2], plating solution temperature: 40 to 60 DEG C, and anode: ruthenium-titanium anode (RuO2 / TiO2). The corrosion resistant nickel-tin alloy plating solution of the invention has the advantages of high deposition rate, favorable stability, uniform thickness of clad layer, outstanding corrosion resistance (the outstanding corrosion resistance is superior to the corrosion resistance of red copper and nickel-phosphorus alloy in sea water), high microhardness of the clad layer and high wearability. The invention is widely applied to the field of corrosion resistance of oceanic and petrochemical industry, printed circuit boards, electrical apparatus elements, space flight and aviation, etc.

Description

technical field [0001] The invention relates to an electroplating bath in the field of material surface treatment, in particular to a corrosion-resistant nickel-tin alloy bath and its electroplating process Background technique [0002] Since R.G.Monk and H.J.T.Ellingnam invented the alkaline nickel-tin alloy plating solution containing potassium nickel cyanate in 1935, electroplating nickel-tin alloy has experienced more than 70 years of development and achieved great results. In 1951, N. Parkinson developed the fluoride acidic nickel-tin alloy plating solution, which was the first time that nickel-tin alloy was successfully applied in industry. In 1978, Hidehiko Natsumoto of Japan developed the patent of pyrophosphate-plated nickel-tin alloy. In 1986, Takayuki Tamura and Nobuo Yasuda developed a nickel-tin-tin alloy plating solution for chlorides in Japan. The domestic start is relatively late, but it has also achieved a lot of success. For example, in 1993, Harbin Insti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 王宏智张卫国姚素薇胡伟明
Owner TIANJIN UNIV
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