Method for electroplating double-layer admiro film on Nd-Fe-B magnetic surface

A zinc-nickel alloy and neodymium-iron-boron technology, which is applied in the field of double-layer zinc-nickel alloy coating on the surface of neodymium-iron-boron magnets, can solve the problems of affecting the anti-corrosion effect and poor bonding force

Inactive Publication Date: 2007-05-02
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology

[0004] In order to solve the problem of poor binding force and affecting the anti-corrosion effect of NdFeB electroplating zinc-nickel alloy, the purpose of the present invention is to provide a method for electroplating double-layer zinc-nickel alloy coating on th

Method used

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specific Embodiment approach 2

[0034] After electroplating double-layer zinc-nickel alloy by embodiment one process, dark green passivation: chromic anhydride 40g / L, phosphoric acid 10mL / L, nitric acid 3mL / L, sulfuric acid 5mL / L, hydrochloric acid 5mL / L, zinc ion 1.Sg / L L, pH ~ 2, soak in the solution for 3 minutes, stay in the air for 15 seconds, wash with water after passivation, and age at 60°C.

[0035] The coating is bright, dark green, with good bonding force, and there is no white rust after 360 hours of neutral salt spray corrosion.

specific Embodiment approach 3

[0036] Carry out pre-plating treatment according to Example 1, zinc sulfate 250g / L, nickel sulfate 50g / L, boric acid 30g / L, brightener 20mL / L, pH value 4, temperature 20 ℃, cathode current density 8A / dm 2 Galvanized nickel alloy for 20 minutes; zinc chloride 100g / L, nickel chloride 80g / L, ammonium chloride 200g / L, brightener B 15mL / L, pH 3.5, temperature 30°C, current density 2.5A / dm 2 Electroplating zinc-nickel alloy for 30 minutes. ;Chromic anhydride 20g / L, titanium ion 5g / L, sulfuric acid 4mL / L, sodium fluoride 3g / L, 50~55℃, soak in the solution for 10~15 seconds, stay in the air for 5~10 seconds, after passivation Wash with water and air dry.

[0037] The coating is bright, iridescent, and has good bonding force, and there is no white rust after 240 hours of neutral salt spray corrosion.

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Abstract

This invention relates to a preparation of electroplating double-deck zinc-nickel alloy coatings on surface of NdfeB magnet, firstly progress treatment before plating; Then pre-plate zinc-nickel alloy; And electroplate zinc-nickel alloy that is high corrosion resistance; At last progress treatment after plating, Its noncorrodibility is well, combination is firm, cost is low, influence toward magnet is small, make it has effect that decreases corroding NdfeB magnet in electroplating process.

Description

Technical field: [0001] The invention relates to the technical field of anti-corrosion on the surface of metal materials, and relates to a method for electroplating a double-layer zinc-nickel alloy coating on the surface of a neodymium-iron-boron magnet. Background technique: [0002] NdFeB permanent magnets are easily oxidized in the air, and are easily corroded in many environments, resulting in reduced magnetic properties and shortened lifespan. The application number is 01140118.4 invention patent, the name is: electroplating zinc-nickel alloy on the surface of NdFeB permanent magnet, which uses electroplating zinc in chloride solution as the bottom layer, and electroplating zinc-nickel alloy in sodium hydroxide solution as the anti-corrosion surface layer, which has a certain anti-corrosion effect . [0003] However, electrogalvanizing with chloride solution, because this type of solution contains a large amount of chloride ions, severely corrodes the NdFeB magnet duri...

Claims

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Application Information

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IPC IPC(8): C25D5/10C25D3/56
Inventor 林福文王岳金建新郭爱红王哲
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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