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Method for overall protection of magnesium / aluminum dissimilar metal connector

A technology of dissimilar metals and connectors, applied in the direction of metal material coating technology, etc., can solve problems such as galvanic corrosion and overall protection difficulties, and achieve the effects of good adhesion, strong protection pertinence, and low cost

Active Publication Date: 2017-12-05
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the corrosion protection problems existing in the popularization and application of magnesium / aluminum dissimilar metal connectors at the present stage, the present invention provides an overall protection method for magnesium / aluminum dissimilar metal connectors, which can solve the galvanic corrosion of magnesium / aluminum dissimilar metal connectors and the problem of overall protection difficulties

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  • Method for overall protection of magnesium / aluminum dissimilar metal connector
  • Method for overall protection of magnesium / aluminum dissimilar metal connector

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Experimental program
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Effect test

Embodiment 1

[0044] Magnesium / aluminum dissimilar metal connectors use ZK60 magnesium alloy / 6061 aluminum alloy adhesive joints. First, carry out alkali cleaning and pickling treatment on the connecting parts to remove oil and rust, and rinse them with clean water; , The solvent is phosphating treatment in the phosphating solution of deionized water, the treatment temperature is 90 degrees Celsius, the treatment time is 20 minutes, then take out the connection parts and rinse them with clean water; finally soak the above-mentioned connection parts into a composition of 3g / L hydrogen peroxide aqueous solution for Baume treatment, the treatment temperature is 95 degrees Celsius, the treatment time is 20 minutes, then take out the connecting piece, rinse it with clean water and dry it. The prepared protective film is dense and uniform as a whole, without stain residues, and the microscopic appearance of the phosphating film layer on the side of the ZK60 magnesium alloy is as follows: figure...

Embodiment 2

[0046]Magnesium / aluminum dissimilar metal connectors use AZ31 magnesium alloy / pure aluminum weldments. First, the connecting parts are subjected to alkali cleaning and pickling treatment to remove oil and rust, and then rinsed with clean water; Sodium, solvent is carried out phosphating treatment in the phosphating solution of deionized water, and treatment temperature is 80 degrees centigrade, and treatment time is 20 minutes, takes out connector afterwards and rinses clean with clear water; Perform Baume treatment in an aqueous solution of 2g / L potassium permanganate, the treatment temperature is 90 degrees Celsius, and the treatment time is 15 minutes. After that, take out the connecting piece, rinse it with clean water and dry it. The prepared protective film is dense and uniform as a whole without stain residue. According to "GB / T 10125-2012 Artificial Atmosphere Corrosion Test Salt Spray Test", after 48 hours of neutral salt spray corrosion test, no obvious corrosion oc...

Embodiment 3

[0048] Magnesium / aluminum dissimilar metal connectors are made of ZK60 magnesium alloy / 7075 aluminum alloy riveting parts, and the rivets are made of aluminum blind rivets. After the riveting is completed, the exposed nail cores are sealed. First, the connecting parts are subjected to alkali cleaning and pickling treatment to remove oil and rust, and then rinsed with clean water; then the connecting parts are soaked in a composition of 50g / L manganese dihydrogen phosphate, 15g / L manganese nitrate, 4g / L sodium phytate , The solvent is phosphating treatment in the phosphating solution of deionized water, the treatment temperature is 95 degrees Celsius, the treatment time is 10 minutes, then take out the connecting piece and rinse it with clean water; finally soak the above-mentioned connecting piece into a composition of 2g / L hydrogen peroxide, 5g / L ammonia water solution for Baume treatment, the treatment temperature is 100 degrees Celsius, the treatment time is 25 minutes, the...

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Abstract

The invention discloses a method for overall protection of a magnesium / aluminum dissimilar metal connector, and the method comprises the following steps: 1) the magnesium / aluminum dissimilar metal connector is firstly phosphated with a phosphating solution to form a phosphate film layer on a magnesium side; 2) the phosphated magnesium / aluminum dissimilar metal connector is placed in a Baume solution for Baume treatment to form a Baume layer on an aluminum side, and the Baume layer meanwhile can close holes of the magnesium side phosphate film layer. The protection method can integrally protect the magnesium / aluminum dissimilar metal connector and reduce galvanic corrosion tendency. According to the difference between the properties of magnesium and aluminum, films can be formed respectively on the magnesium side and the aluminum side of the magnesium / aluminum dissimilar metal connector for matching, the films are highly targeted to protection of substrates, and the films have good adhesion. The protection method is simple and easy, low in cost, high in processing efficiency, and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an overall protection method for magnesium / aluminum dissimilar metal connectors, belonging to the field of material corrosion protection and surface treatment. Background technique [0002] Magnesium alloy has the characteristics of low density, high specific strength, good damping performance, and good electromagnetic radiation shielding performance. It is internationally recognized as one of the most promising lightweight metal structural materials. The energy saving and emission reduction benefits of magnesium alloy application are remarkable, and it has a wide range of application and development needs in the fields of automobiles, high-speed trains, and national defense and military industries. my country is rich in magnesium ore resources, and the large-scale application of magnesium is conducive to alleviating the shortage of resources such as iron ore and oil and gas in my country, and at the same time can promote the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/68C23C22/82
CPCC23C22/68C23C22/82
Inventor 李涛周吉学刘洪涛吴建华唐守秋杨院生詹成伟陈燕飞
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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