High-strength anti-corrosion aluminum/magnesium dissimilar alloy connector containing middle layer and preparing method of connector

An intermediate layer and magnesium alloy technology, applied in welding equipment, metal processing equipment, coating, etc., can solve the problems of poor corrosion performance and low strength, and achieve the effect of improving corrosion resistance, increasing tensile strength, and inhibiting compounds

Active Publication Date: 2018-12-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low strength and poor corrosion performance of aluminum / magnesium dissimilar alloy joints, the present invention provides a high-strength corrosion-resistant aluminum / magnesium dissimilar alloy joint with an intermediate layer, that is, adding Co-Cr compound between magnesium alloy and aluminum alloy Metal coating as an intermediate layer to form aluminum alloy / intermediate layer / magnesium alloy dissimilar joints

Method used

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  • High-strength anti-corrosion aluminum/magnesium dissimilar alloy connector containing middle layer and preparing method of connector
  • High-strength anti-corrosion aluminum/magnesium dissimilar alloy connector containing middle layer and preparing method of connector
  • High-strength anti-corrosion aluminum/magnesium dissimilar alloy connector containing middle layer and preparing method of connector

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preparation example Construction

[0030] A method for preparing a high-strength corrosion-resistant aluminum / magnesium dissimilar alloy joint for a multi-material vehicle body in the present invention, the specific implementation of this preparation method has the following steps:

[0031] The first step: plate surface pretreatment

[0032] The surface of the aluminum alloy sheet and magnesium alloy sheet to be welded is pretreated, and polished on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in sequence to remove surface scale and impurities, and then use 0.25μm particle size diamond The abrasive paste is mechanically polished, followed by chemical polishing with 2% hydrochloric acid alcohol solution to remove surface polishing marks, and finally ultrasonically cleaned in acetone and alcohol for 20 minutes, and dried with cold air.

[0033] The second step: Co-Cr intermediate layer preparation

[0034] (A) Put the magnesium alloy sheet with the surface pretreatment in the first step into the ion impla...

Embodiment 1

[0041] The first step: plate surface pretreatment

[0042] Perform surface pretreatment on the 5052 aluminum alloy plate and ZK60 magnesium alloy plate to be welded, and polish them on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in turn to remove surface scale and impurities, and then use 0.25μm grain Diamond grinding paste was used for mechanical polishing, followed by chemical polishing with 2% volume fraction hydrochloric acid alcohol solution to remove surface polishing marks, and finally ultrasonic cleaning in acetone and alcohol for 20 minutes, and cold air drying.

[0043] The second step: Co-Cr intermediate layer preparation

[0044] (A) Put the ZK60 magnesium alloy plate with the surface pretreatment in the first step into the ion implantation deposition composite coating machine for chromium ion implantation deposition, using pure chromium (99.99%) as the cathode target, in a vacuum of 1 × 10 -4 Pa start arc, ion implantation dose 5×10 15 ions / cm 2 , injec...

Embodiment 2

[0056] The first step: plate surface pretreatment

[0057] The surface of the 6061 aluminum alloy sheet and the AZ31B magnesium alloy sheet to be welded are pretreated, and polished on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in sequence to remove surface scale and impurities, and then use 0.25μm grain Diamond grinding paste was used for mechanical polishing, followed by chemical polishing with 2% volume fraction hydrochloric acid alcohol solution to remove surface polishing marks, and finally ultrasonic cleaning in acetone and alcohol for 20 minutes, and cold air drying.

[0058] The second step: Co-Cr intermediate layer preparation

[0059] (A) Put the AZ31B magnesium alloy sheet with the surface pretreatment in the first step into the ion implantation deposition composite coating machine for chromium ion implantation deposition, using pure chromium as the cathode target, in a vacuum of 1×10 -4 Pa start arc, ion implantation dose 1×10 16 ions / cm 2 , injection v...

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Abstract

The invention relates to a high-strength anti-corrosion aluminum / magnesium dissimilar alloy connector containing a middle layer. The alloy connector is sequentially provided with an aluminum alloy, the middle layer and a magnesium alloy from top to bottom; the aluminum alloy is 5-series or 6-series aluminum alloy plates, the magnesium alloy is AZ-series or ZK-series magnesium alloy plates, and themiddle layer is a Co-Cr composite metal coating; and the thickness of the Co-Cr composite metal coating is 2.8 microns-6.6 microns. By means of the high-strength anti-corrosion aluminum / magnesium dissimilar alloy connector and the preparing method, reacting between the Al and the Mg can be effectively slowed down, forming of Al-Mg intermetallic compounds at the interface position is restrained, the microstructure of the connector is improved, the mechanical strength and the corrosion property of the connector are further improved, and the using requirement of the aluminum / magnesium dissimilaralloy connector in a multi-material car body is met.

Description

technical field [0001] The invention belongs to the field of connection of dissimilar materials, in particular to a method for preparing dissimilar joints of aluminum alloy and magnesium alloy. Background technique [0002] The rapid growth of my country's automobile market has brought great pressure on environmental protection and energy reserves. Under the background of deteriorating living environment and insufficient energy reserves, the energy saving and emission reduction of automobiles is particularly urgent. For vehicles that meet Euro IV emission standards, there is a simple linear relationship between fuel consumption Y per 100 kilometers and vehicle weight X: Y=0.003X+3.3434. It can be seen that vehicle lightweight is an important way for the sustainable development of my country's automobile industry. [0003] Automobile lightweight is usually carried out in the order of body-chassis-powertrain-electrical and air-conditioning systems. The body system accounts for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/48C23C14/16B23K20/12
CPCB23K20/122C23C14/16C23C14/48
Inventor 郑洋陈勇
Owner HEBEI UNIV OF TECH
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