Amorphous state iron phosphorus alloy electroplate liquid and preparation method

A technology of alloy electroplating solution and amorphous iron, which is applied in the field of amorphous iron-phosphorus alloy electroplating solution and the alloy obtained from the plating solution, can solve the problems of unsatisfactory corrosion resistance, unsatisfactory corrosion resistance, and iron-phosphorus coating High stress and other problems, to achieve the effect of low cost, easy maintenance, and less surface defects

Inactive Publication Date: 2010-06-30
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the iron-phosphorus coating deposited from the chloride bath has a large stress, resulting in many surface cracks and unsatisfactory corrosion resistance.
In order to reduce the surface defects of the iron-phosphorus coating, the Chinese invention patent 200580006411.0 'iron-phosphorus electroplating bath and method' adds sulfur-containing organic additives to the ferric chloride plating solution to electrodeposit Fe-P-S alloys (containing a small amount of sulfur), which can be reduced to a certain extent. Defects on the surface of the coating (such as cracks, pores, etc.), but the corrosion resistance of the coating in media such as sodium chloride is still not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Amorphous iron-phosphorus alloy electroplating solution of the present invention contains in every liter of electroplating solution: ferrous sulfate (FeSO 4 ·7H 2 O) 110g, sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 15g, sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) 15g or citric acid (C 6 h 8 o 7 ·H 2 O) 10.5g, boric acid (H 3 BO 3 ) 30g, sodium chloride (NaCl) 10g, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 (2) 20g, ascorbic acid 2g, and the balance is water.

[0013] The deposition conditions of the above electroplating solution are: cathode current density 50mA / cm 2 , the pH of the plating solution is 2.5, the operating temperature is 55°C, use pure iron or low carbon steel as the anode, pure iron is better, because carbon will form anode slime, and the anode area should be slightly larger than the cathode area.

[0014] Using the above electroplating solution and deposition conditions, the amorphous iron-phosphorus alloy coating contains 77.2 atomic percent ...

Embodiment 2

[0017] Amorphous iron-phosphorus alloy electroplating solution of the present invention contains in every liter of electroplating solution: ferrous sulfate (FeSO 4 ·7H 2 O) 140g, sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 30g, sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) 20g or citric acid (C 6 h 8 o 7 ·H 2 O) 18g, boric acid (H 3 BO 3 ) 30g, sodium chloride (NaCl) 10g, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 (2) 20g, ascorbic acid 2g, and the balance is water.

[0018] The deposition conditions of the above electroplating solution are: cathode current density 60mA / cm 2 , the pH of the plating solution is 2.3, the operating temperature is 50°C, use pure iron or low carbon steel as the anode, pure iron is better, because carbon will form anode slime, and the anode area should be slightly larger than the cathode area.

[0019] The amorphous iron-phosphorus alloy coating obtained by adopting the above-mentioned electroplating solution and deposition conditions contain...

Embodiment 3

[0022] Amorphous iron-phosphorus alloy electroplating solution of the present invention contains in every liter of electroplating solution: ferrous sulfate (FeSO 4 ·7H 2 O) 140g, sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 40g, sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) 20g or citric acid (C 6 h 8 o 7 ·H 2 O) 18g, boric acid (H 3 BO 3 ) 30g, sodium chloride (NaCl) 10g, aluminum sulfate (Al 2 (SO4 ) 3 18H 2 (2) 20g, ascorbic acid 2g, and the balance is water.

[0023] The deposition conditions of the above electroplating solution are: cathode current density 70mA / cm 2 , the pH of the plating solution is 2.0, the operating temperature is 50°C, use pure iron or low carbon steel as the anode, pure iron is better, because carbon will form anode slime, and the area of ​​the anode should be slightly larger than the area of ​​the cathode.

[0024] The amorphous iron-phosphorus alloy coating obtained by adopting the above-mentioned electroplating solution and deposition co...

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Abstract

The invention discloses an amorphous state iron phosphorus alloy electroplate liquid and a preparation method. Each L of electroplate liquid comprises 110-200g of ferrous sulfate, 15-50g of sodium hypophosphite, 15-30g of sodium citrate or 10.5-21g of citric acid, 30g of boric acid, 10g of sodium chloride, 20g of aluminum sulfate, 2g of ascorbic acid and water in balance amount. The preparation of 1 L of electroplate liquid is realizes by the following scheme: dissolving 15-30g of the sodium citrate or 10.5-21g of the citric acid into about 700mL of water; preparing sodium citrate water solution or citric acid water solution; sequentially adding 2g of the ascorbic acid, 30g of the boric acid, 110-200g of the ferrous sulfate, 10g of the sodium chloride and 20g of the aluminum sulfate; completely stirring and dissolving; adding 15-50g of the sodium hypophosphite; completely dissolving in a stirring way; and adding the water in balance amount till than the total volume is 1L. The plated film surface of the amorphous state iron phosphorus alloy which is electroplated with the electroplate liquid has less defects, has silvery white appearance, has no crack, is smooth and compact, and has strong bond with the base body.

Description

technical field [0001] The invention relates to an amorphous iron-phosphorus alloy electroplating solution and an alloy obtained from the electroplating solution, and belongs to the field of electroplating for metal surface treatment. Background technique [0002] Electrodeposited amorphous iron-phosphorus alloy as-plated coating has a hardness of about 500kg / mm 2 , and up to 1000kg / mm ​​after heat treatment at 400℃ 2 , so it is a metal material with excellent wear resistance; due to the concentration and enrichment of phosphorus on the surface, dense insoluble phosphate will be generated, thereby improving the self-passivation ability of the coating, and the amorphous structure makes the coating have excellent corrosion resistance performance . In conclusion, electroplated amorphous iron-phosphorous coatings have attracted more and more attention due to their excellent corrosion resistance, high hardness and wear resistance. From the papers and patents published at home ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 王森林宋运建
Owner HUAQIAO UNIVERSITY
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