Plating solution for plating nickel and phosphorus on surface of magnesium lithium alloy and low-temperature plating method

A magnesium-lithium alloy, surface chemistry technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve problems such as surface corrosion, surface pitting corrosion of magnesium-lithium alloy, and achieve uniform and dense coating and good appearance , the effect of bright surface

Active Publication Date: 2013-08-28
镁高镁诺奖(铜川)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nickel-phosphorus electroless plating solution on the surface of magnesium-lithium alloy, which solves the problem that the existing plating solution easily causes pitting or surface corrosion on the surface of magnesium-lithium alloy

Method used

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  • Plating solution for plating nickel and phosphorus on surface of magnesium lithium alloy and low-temperature plating method
  • Plating solution for plating nickel and phosphorus on surface of magnesium lithium alloy and low-temperature plating method
  • Plating solution for plating nickel and phosphorus on surface of magnesium lithium alloy and low-temperature plating method

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Effect test

Embodiment 1

[0037] Step 1, weigh the following components respectively: main salt: nickel sulfate 25g / L, reducing agent: sodium hypophosphite 27g / L, complexing agent: citric acid 8g / L, corrosion inhibitor: ammonium hydrogen fluoride 10g / L, Accelerator: hydrofluoric acid 12mL / L, stabilizer: thiourea 2mg / L, brightener: sodium lauryl sulfate 5mg / L, after mixing the above components evenly, use ammonia water to adjust the pH value to 5.5 to obtain magnesium Lithium alloy surface electroless nickel phosphorus plating solution;

[0038] Step 2, the surface of the Mg-8%Li-based magnesium-lithium alloy workpiece near the eutectic point is sequentially polished with 400#, 800# and 1200# metallographic sandpaper to remove stains and plaques on the surface, making the surface smooth and without obvious scratches;

[0039] Step 3, ultrasonically cleaning the Mg-8%Li-based magnesium-lithium alloy workpiece after surface polishing in acetone for 8 minutes to remove oil stains on the surface of the sub...

Embodiment 2

[0049] Step 1, weigh the following components respectively: main salt: nickel sulfate 25g / L, reducing agent: sodium hypophosphite 27g / L, complexing agent: citric acid 8g / L, corrosion inhibitor: ammonium hydrogen fluoride 10g / L, Accelerator: hydrofluoric acid 12mL / L, stabilizer: thiourea 2mg / L, brightener: sodium lauryl sulfate 5mg / L, after mixing the above components evenly, adjust the pH value to 6 with ammonia water to obtain magnesium Lithium alloy surface electroless nickel phosphorus plating solution;

[0050] Step 2, the surface of the Mg-4%Li-based magnesium-lithium alloy workpiece is sequentially polished with 200#, 800# and 1200# metallographic sandpaper to remove stains and plaques on the surface, making the surface smooth and free of obvious scratches;

[0051] Step 3, ultrasonically cleaning the hypoeutectic Mg-4%Li-based magnesium-lithium alloy workpiece after surface polishing in acetone for 5 minutes to remove oil stains on the surface of the substrate, and then...

Embodiment 3

[0058] Step 1, weigh the following components respectively: main salt: nickel sulfate 27g / L, reducing agent: sodium hypophosphite 30g / L, complexing agent: citric acid 7g / L, corrosion inhibitor: ammonium hydrogen fluoride 9g / L, Accelerator: hydrofluoric acid 10mL / L, stabilizer: thiourea 1.5mg / L, brightener: sodium lauryl sulfate 5mg / L, after mixing the above components evenly, adjust the pH value to 6 with ammonia water to obtain Electroless nickel-phosphorus plating solution on the surface of magnesium-lithium alloy;

[0059] Step 2, the surface of the Mg-12%Li-based magnesium-lithium alloy workpiece is polished sequentially with 400#, 1200# and 2000# metallographic sandpaper to remove stains and plaques on the surface, making the surface smooth and free of obvious scratches;

[0060] Step 3, the Mg-12%Li-based magnesium-lithium alloy workpiece after surface grinding is ultrasonically cleaned in acetone for 3 minutes to remove the oil stain on the surface of the substrate, and...

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Abstract

The invention relates to a plating solution for plating nickel and phosphorus on a surface of magnesium lithium alloy. 1 L of the plating solution consists the following components: 25-35 g of main salt nickel sulfate, 25-35 g of reducing agent sodium hypophosphite, 5-10 g of complexing agent citric acid, 10-15 g of corrosion inhibitor ammonium hydrogen fluoride, 10-15 mL of accelerator hydrofluoric acid, 0-2 mg of stabilizer thiourea and 0.5-5 mg of brightener lauryl sodium sulfate. A low-temperature plating method comprises the following steps of: performing surface grinding on a magnesium lithium alloy workpiece; degreasing; performing alkali washing; performing acid washing; activating; and finally placing the magnesium lithium alloy workpiece into the plating solution for plating nickel and phosphorus on the surface of the magnesium lithium alloy, and plating. According to the plating solution, the nickel sulfate serves as the main salt, and the corrosion inhibitor and the brightener are added, so the matrix can be prevented from being corroded in the chemical nickel phosphorus plating process of the magnesium lithium alloy, the obtained plating layer is uniform, compact and bright, the nickel phosphorus plating layer has a good binding force and good corrosion resistance, the surface of the magnesium lithium alloy is effectively protected, and a good decorative effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of surface corrosion and protection, and relates to an electroless nickel-phosphorus plating solution on the surface of a magnesium-lithium alloy, and also relates to a low-temperature plating method for the electroless nickel-phosphorus plating solution on the surface of the magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structure material. It has the characteristics of ultra-light, high specific strength, high toughness, and can realize the most effective shielding and protection against electromagnetic waves and cosmic rays. The emphasis on body materials has a very broad application prospect. However, since metallic lithium is a very active metal element, the corrosion resistance of magnesium-lithium alloys is extremely poor, which largely limits the engineering applications of the alloys. At present, the research on magnesium-lithium alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 徐春杰余玲张金皛张忠明
Owner 镁高镁诺奖(铜川)新材料有限公司
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