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Method for preparing magnesium phosphate/Super-P composite corrosion-resistant coating

A magnesium phosphate and anti-corrosion technology, applied in the direction of coating, phosphating, electrolytic coating, etc., can solve the problems of thin coating, poor bonding between coating and base material, low corrosion resistance, etc., and achieve dense coating , increased thickness, improved corrosion resistance

Active Publication Date: 2019-01-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problems to be solved by the present invention are: the traditional NdFeB phosphating film has low corrosion resistance, the bonding force between the coating layer and the base material is poor, and the thickness of the coating layer is relatively thin

Method used

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  • Method for preparing magnesium phosphate/Super-P composite corrosion-resistant coating
  • Method for preparing magnesium phosphate/Super-P composite corrosion-resistant coating
  • Method for preparing magnesium phosphate/Super-P composite corrosion-resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare the sample NdFeB, the sample size is: 10mm×10mm×5mm.

[0024] (2) Alkali washing and degreasing and process conditions: sodium hydroxide 3g / L, sodium carbonate 30g / L, sodium phosphate 50g / L, op-10 emulsifier 0.5g / L, the rest is water, the temperature is 30 ℃, the treatment Time 30s.

[0025] (3) Pickling rust removal and process conditions: Immerse the degreasing and water-washed sample into a mixture containing 3% nitric acid and 3% sulfuric acid, and the rest is water; the temperature is room temperature, and the time is 10s.

[0026] (4) Electroplating solution components and process conditions: magnesium oxide 2g / L, phosphoric acid 10g / L, Super-P 200mg / L, surfactant 50mg / L, deionized water 200ml, pH value 4.4, current density 5mA / cm 2 , the time is 20min, and the temperature is 50°C.

[0027] (5) Rinse with clean water after electrodeposition and dry with a hair dryer.

[0028] The coating obtained in this embodiment is bright gray, uniform in color...

Embodiment 2

[0030] (1) Prepare the sample NdFeB, the sample size is: 10mm×10mm×5mm;

[0031] (2) Alkaline cleaning and degreasing and process conditions: sodium hydroxide 5g / L, sodium carbonate 35g / L, sodium phosphate 60g / L, op-10 emulsifier 1g / L, the rest is water, the temperature is 30°C, and the processing time 40s;

[0032] (3) Pickling rust removal and process conditions: Immerse the degreasing and water-washed sample into a mixture containing 3% nitric acid and 3% sulfuric acid, and the rest is water; the temperature is room temperature, and the time is 15s;

[0033] (4) Plating solution components and process conditions: magnesium oxide 2g / L, phosphoric acid 10g / L, Super-P 200mg / L, surfactant 50mg / L, deionized water 200ml, pH value 4.5, current density 5mA / cm 2 , the time is 20min, and the temperature is 60°C.

[0034] (5) Rinse with clean water after electrodeposition and dry with a hair dryer.

[0035] The obtained coating is bright gray, uniform in color, relatively dense, ...

Embodiment 3

[0037] (1) Prepare the sample NdFeB, the sample size is: 10mm×10mm×5mm;

[0038] (2) Alkaline cleaning and degreasing and process conditions: sodium hydroxide 7g / L, sodium carbonate 40g / L, sodium phosphate 70g / L, op-10 emulsifier 1.5g / L, the rest is water, the temperature is 40 ℃, the treatment time 50s;

[0039] (3) Pickling rust removal and process conditions: Immerse the degreasing and water-washed sample into a mixture containing 3% nitric acid and 3% sulfuric acid, and the rest is water; the temperature is room temperature, and the time is 20s;

[0040](4) Electroplating solution components and process conditions: magnesium oxide 3g / L, phosphoric acid 15g / L, Super-P 250mg / L, surfactant 55mg / L, deionized water 200ml, pH value 4.5, current density 5mA / cm 2 , the time is 15min, and the temperature is 70°C.

[0041] (5) Rinse with clean water after electrodeposition and dry with a hair dryer.

[0042] The obtained coating is bright gray, uniform in color, very dense, and...

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Abstract

The invention discloses a method for preparing a magnesium phosphate / Super-P composite corrosion-resistant coating, which belongs to the field of neodymium iron boron permanent magnet material surfaceplating. The method of the invention comprises the following steps: a neodymium iron boron matrix is subjected to alkaline washing and oil removal, pickling and rust removal, sand paper grinding, andelectrodeposition, the electrolyte comprises the following composition: 2 to 3 g / L of magnesium oxide, 10 to 15 g / L of phosphoric acid, 200 to 250 mg / L of Super-P, and 50 to 55 mg / L of a surfactant.The method of the invention is simple, environmentally friendly and non-polluting, and the obtained coating is thick, uniform and compact, and has good bonding property; and the addition of Super-P significantly improves the corrosion resistance of the coating and protects the neodymium iron boron matrix.

Description

technical field [0001] The invention relates to a method for preparing a magnesium phosphate / Super-P composite corrosion-resistant coating and relates to the field of surface electroplating of NdFeB permanent magnet materials. Background technique [0002] NdFeB magnets are considered as the third-generation rare earth permanent magnets due to their good magnetic properties and cost performance. However, due to the multiphase structure of this type of material, their corrosion resistance is relatively poor in most environments; this Defects have greatly restricted the development of its industry. [0003] Many people at home and abroad have done research on improving the corrosion resistance of NdFeB permanent magnet materials, such as alloying methods and coating protection methods; studies have shown that adding alloying elements can promote the formation of intermetallic compounds at grain boundaries, which can improve magnets. The potential of the intergranular phase, t...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D11/36C25D7/00
CPCC25D7/001C25D11/36C25D15/00
Inventor 范云鹰贺本龙
Owner KUNMING UNIV OF SCI & TECH
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