Preparation method for corrosion-resistant and high-conduction-characteristic magnesium alloy

Abstract

The invention provides a preparation method for a corrosion-resistant and high-conduction-characteristic magnesium alloy. The preparation method for the corrosion-resistant and high-conduction-characteristic magnesium alloy comprises the steps of pretreatment, water washing, acid washing, water washing, surface adjustment, water washing, chemical conversion, water washing, drying and the like which are sequentially carried out, wherein a uniform and compact chemical conversion film is formed on the surface of the magnesium alloy, and the performance of both corrosion resistance and high conduction characteristic of the magnesium alloy product is given. A test indicates that the contact resistance of a magnesium alloy sample prepared by the method is lower to 100mOhm; and after 24h after aneutral salt mist test, the surface grade of the magnesium alloy sample is 9, and the surface contact resistance is 200mOhm to 400mOhm. The method is especially applicable to the field of 3C productshaving a conductive requirement or an electromagnetic shielding requirement on a magnesium alloy material, has the advantages of being simple in process operation, green, safe and environmentally friendly, low in cost, and suitable for industrialized production, and expands the application range of the magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a method for preparing a magnesium alloy with corrosion resistance and high electrical conductivity. Background technique [0002] Magnesium alloy is one of the commonly used engineering materials. It not only has light weight, excellent mechanical properties and thermal and electrical conductivity, but also has the advantages of shock resistance, anti-electromagnetic interference, non-toxicity and convenient recycling. It can be widely used in the electronics industry, aerospace , lighting equipment and other technical fields. Good electrical conductivity is one of the important requirements of 3C products for structural materials, mainly because structural materials with good electrical conductivity can eliminate ESD (Electro-Static discharge, electrostatic discharge) and EMI (Electro-Magnetic Interference, electromagnetic interference) caused by static electric...

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Problems solved by technology

The surface metal conductivity modification method is to use electroless plating or electroplating to plate a layer of metal film with good conductivity on the surface of the magnesium alloy, which has the disadvantages of large pollution of the plating solution and is not conducive to environmental protection.

The conductive modification method of surface organic coatings is to spray organic coatings doped with conductive metals or with conductive properties onto the surface of the material to achieve the purpose of conductivity, which has the disadvantages of high cost and few applications

The chemical conversion conductive modification method is an emerging technology. At present, this method has disadvantages in terms of safety and waste liquid treatment. For example, the chemical conversion liquid needs to use strong oxidizing substances such as permanganate and metavanadate. However, the magnesium alloy products prepared by this method have good corrosion resistance and electrical conductivity.

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