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High corrosion resistance nickel-tin-phosphorus alloy plating liquid

A high corrosion resistance, alloy technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problem of poor corrosion resistance and wear resistance of the coating, low phosphorus content in the coating, and stable plating solution It can achieve the effect of strong wear resistance, low corrosion potential and uniform thickness

Inactive Publication Date: 2008-06-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are not many research reports on Ni-Sn-P alloy coatings at home and abroad, and there are disadvantages such as poor stability of the plating solution and slow plating speed.
[0004] Disclosed in Chinese patent CN1317596A is a kind of plating solution and method of self-catalyzed nickel-tin-phosphorus alloy. Its disadvantages are that the phosphorus content in the coating is low and the hardness of the coating is low, so the corrosion resistance and wear resistance of the coating poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A nickel-tin-phosphorus alloy plating solution with high corrosion resistance, containing in every liter of solution:

[0023] NiSO 4 ·6H 2 O 10g,

[0024] NaH 2 PO 2 ·H 2 O 20g,

[0025] SnCl 4 ·3H 2 O 5g,

[0026] CH 3 COONa 10g,

[0027] Compound hydroxycarboxylic acid complexing agent 10g,

[0028] Complex hydroxycarboxylic acid accelerator 0.060g,

[0029] Pb 2+ 0.001g, the balance is water, and the pH value of described solution is 4.5, and described composite hydroxycarboxylic acid complexing agent is made up of following components by weight percentage: 50% of lactic acid, 50% of citric acid; The acid accelerator consists of the following components by weight percentage: glycine 8%, propionic acid 3%, adipic acid 89%.

[0030] Coating performance index

[0031] Ni 86.10wt%

[0032] Sn 0.50wt%

[0033] P 13.40wt%

[0034] Porosity (15μm) None

[0035] Microhardness 1120HV

[0036] Corrosion potential 400mV vs. SCE,

[0037] ...

Embodiment 2

[0041] A nickel-tin-phosphorus alloy plating solution with high corrosion resistance, containing in every liter of solution:

[0042] NiSO 4 ·6H 2 O 20g,

[0043] NaH 2 PO 2 ·H 2 O 40g,

[0044] SnCl 4 ·3H 2 O 20g,

[0045] CH 3 COONa 30g,

[0046] Compound hydroxycarboxylic acid complexing agent 20g,

[0047] Complex hydroxycarboxylic acid accelerator 0.125g

[0048] Pb 2+ 0.0015g, the balance is water, and the pH value of described solution is 4.8, and described composite hydroxycarboxylic acid complexing agent is made up of following components by weight percentage: lactic acid 65%, potassium citrate 35%; The carboxylic acid accelerator consists of the following components by weight percentage: glycine 16%, propionic acid 8%, adipic acid 76%.

[0049] Coating performance index:

[0050] Ni 85.57wt%

[0051] Sn 0.85wt%

[0052] P 13.58wt%

[0053] Porosity (15μm) None

[0054] Microhardness 1180HV

[0055] Corrosion potential 350mV vs. S...

Embodiment 3

[0060] A nickel-tin-phosphorus alloy plating solution with high corrosion resistance, containing in every liter of solution:

[0061]NiSO 4 ·6H 2 O 25g,

[0062] NaH 2 PO 2 ·H 2 O 40g,

[0063] SnCl 4 ·3H 2 O 25g,

[0064] CH 3 COONa 30g,

[0065] Compound hydroxycarboxylic acid complexing agent 25g,

[0066] Complex hydroxycarboxylic acid accelerator 0.150g,

[0067] Pb 2+ 0.002g, the balance is water, the pH value of described solution is 5.2, and described composite hydroxycarboxylic acid complexing agent is made up of following components by weight percentage: lactic acid 60%, sodium citrate is 40%; The hydroxycarboxylic acid accelerator is composed of the following components by weight percentage: glycine 10%, propionic acid 7%, adipic acid 83%.

[0068] Coating performance index

[0069] Ni 85.88wt%

[0070] Sn 0.98wt%

[0071] P 13.14wt%

[0072] Porosity (15μm) None

[0073] Microhardness 1200HV

[0074] Corrosion potential 390mV v...

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Abstract

The invention discloses a high corrosion-resistant nickel-tin-phosphorus alloy plating liquid and is characterized in that: each liter of solution comprises: NiSO4.6H2O of 10 to 45g, NaH2PO2.H2O of 20 to 70g, SnCl4.3H2O of 5 to 30g, CH3COONa of 10 to 50g, complex hydroxycarboxylic complexing agent of 10 to 45g, complex hydroxycarboxylic promoter of 0.060 to 0.600g, Pb2+ or thiourea of 0.001 to 0.008g, the remainder is water. The pH value of the solution is between 4.2 and 5.5. The plating liquid of the invention has quick deposition and good stability; the plating layer has no holes, even thickness, lower corrosion potential and excellent corrosion resistance, and is superior to copper, nickel-phosphorus alloy and stainless steel in sea water; the plating layer has high micro-rigidity and strong abrasion-resistant ability. The invention is widely used in fields such as corrosion resistance of ocean, petrochemical industry, printed circuit boards, electric elements, spaceflight and aviation and so on.

Description

technical field [0001] The invention relates to an electroless plating solution in the field of material surface treatment, in particular to a nickel-tin-phosphorus alloy plating solution. Background technique [0002] Since Wartz was the first to engage in electroless nickel plating in 1845, electroless nickel plating has a history of more than 160 years. At present, the research on the binary nickel system, especially the Ni-P alloy, is quite common at home and abroad. The Ni-P alloy coating has a bright and glossy surface, outstanding mechanical properties, good adhesion to the substrate, and wear resistance and corrosion resistance are comparable to other coatings. Compared with alloy plating, the advantages are obvious. It has also been widely used in chemical industry, machinery, electronics, aerospace, energy, transportation and other industrial fields. However, with the development of modernization, people's requirements continue to increase, and binary nickel alloy...

Claims

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Application Information

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IPC IPC(8): C23C18/36
Inventor 王宏智张卫国姚素薇
Owner TIANJIN UNIV
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