Surface treatment method for weldability and protectivity of aluminium alloy tube shell

Abstract

The invention provides a surface treatment method for weldability and protectivity of an aluminium alloy tube shell, and aims to provide a surface treatment method which has good weldability and strong corrosion resistance and can keep high reliability in salt mist and other harsh environment. The surface treatment method is realized by the following technical solutions of firstly, performing chemical oxidation treatment on the whole aluminium alloy tube shell; then, protecting the positions with in no need of coating silver with electroplating protective glue, and removing a chemical oxidation film on the positions which needs to be coated with the silver in a NaOH-based alkali etching solution; and plating the silver according to a process flow of treatment before plating-twice zinc immersion-nickel preplating-silver electroplating-treatment after plating, wherein the thickness of the plating layer is as follows: the thickness of Ep.Ni is 5-7[mu]m; and the thickness of Ag is 7-9[mu]m. The method makes up the defects of poor weldability of the plating layer, poor binding force of the plating layer, easy corrosion of the tube shell, high cost and the like which are caused by a gold-plating method for the aluminium alloy tube shell of a millimeter wave circuit assembly, and can significantly increase the corrosion resistance and weldability of the aluminium alloy tube shell.

Description

technical field [0001] The invention relates to a surface treatment method with weldability and high overall protection for the welding area of ​​an aluminum alloy shell, in particular to a surface treatment method for a weldable area and high overall protection for the welding area of ​​an aluminum alloy shell of a millimeter wave circuit component. Background technique [0002] Millimeter waves are favored for their short wavelength, wide frequency band, quasi-light and quasi-all-weather characteristics, and are widely used in high-precision radar and navigation systems, communication systems, radiometer application systems, medical diagnosis and treatment equipment and other military and civilian field. Millimeter wave multi-chip module (MCM) is a hybrid integrated circuit technology. In order to solve the packaging problem of millimeter wave radio frequency components, it is necessary to lead the radio frequency signal out of the metal shielding shell. Millimeter-wave c...

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Problems solved by technology

[0007] The purpose of the present invention is to provide an aluminum alloy shell with good weldability and anti-corrosion ability in view of the problems that the aluminum alloy shell of the millimeter-wave circuit component is plated with gold, the coating has poor weldability, the bonding force of the coating is insufficient, and the shell is easy to corrode. Strong, surface treatment method that can maintain high reliability in salt spray and other harsh environments

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