Method for preparing functional coating on surface of aluminum alloy selectively

Abstract

The invention discloses a method for preparing a functional coating on the surface of an aluminum alloy selectively. The method for preparing the functional coating on the surface of the aluminum alloy selectively comprises the following steps of: S1. machining an aluminum alloy cavity body and an aluminum alloy mask shell; S2. cleaning the aluminum cavity body and the aluminum alloy mask shell; S3. combining the aluminum alloy cavity body and the aluminum alloy mask shell; S4. depositing a plurality of layers of metal films on a combined body of the aluminum cavity body and the aluminum alloy mask shell; and S5. detaching the aluminum alloy mask shell, thereby obtaining the aluminum alloy cavity body for depositing the plurality of layers of metal films selectively. According to the invention, parts of the aluminum alloy cavity body, which are not required to be coated, are subjected to mask protection by adopting the aluminum alloy mask shell so as to achieve the aim of preparing the functional coating accurately and selectively.

Description

technical field [0001] The invention relates to an aluminum alloy surface technology, in particular to a method for selectively preparing a functional coating on the aluminum alloy surface. Background technique [0002] Aluminum alloy materials are widely used in various instruments and equipment due to their small specific gravity, good durability and easy processing. In some special microwave and millimeter wave integrated circuit combination modules, aluminum alloy materials with light specific gravity must be used for the cavity, and components are selectively bonded or welded at different positions on it according to the requirements of the drawings. Some positions on the aluminum alloy cavity that need to be bonded or welded have higher requirements on surface conductivity to meet the electrical performance requirements of the module for microwave signals, while other parts of the surface require stronger corrosion protection Ability to meet the requirements of the th...

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Problems solved by technology

[0005] However, this technology has the following disadvantages: 1. The existing partial electroplating coating technology needs to immerse the aluminum alloy cavity as a whole in the plating solution, which makes it difficult to achieve high-resistance plating protection for parts that do not require electroplating coating, making the process of operation difficult. The consistency is poor, the accuracy control is difficult, and it is easy to cause uneven edges

2. Permeation plating is prone to occur at the boundary of the aluminum alloy cavity plating resistance protection. In severe cases, peeling will occur, and the corrosion resistance will decrease, resulting in quality hazards

3. Most of the negative photoresists, inks and other resisting materials used in the prior art contain toxic substances, which affect the health of operators and the long-term effective use of electroplating solutions

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