Method for composite copper plating on inner wall of coupler bellows and coupler bellows

Abstract

The invention relates to a method for composite copper plating of the inner wall of a coupler corrugated pipe. The method comprises the following steps of assembling a tensile protection mold and a pure nickel inner anode mold on the corrugated pipe to be treated; conducting nickel preplating treatment on the corrugated pipe provided with the tensile protection mold and the pure nickel inner anodemold; washing the corrugated pipe obtained after nickel preplating, taking out the pure nickel inner anode mold, placing a pure copper inner anode mold, and conducting electrochemical copper platingtreatment; washing the corrugated pipe obtained after the electrochemical copper plating, taking out the pure copper inner anode mold, and performing chemical copper plating treatment; and cleaning the corrugated pipe obtained after chemical copper plating, and disassembling the mold. By means of the method, a corrugated pipe stretching protection mold is used for avoiding a plating layer on the outer wall of the corrugated pipe, the corrugated pipe is subjected to the plating process in the stretched state, and a plating layer can be more even; electric field distribution of the cathode and the anode is adjusted by a pure nickel inner anode and a pure copper inner anode, and the uniformity of the plating layer is improved; and the thickness of the plating layer can be precisely controlledby controlling the current density and time.

Description

technical field [0001] The invention relates to the field of microwave electric vacuum, in particular to a method for composite copper plating on the inner wall of a coupler bellows and the coupler bellows. Background technique [0002] In the field of microwave electric vacuum, the high-power input coupler (coupler for short) is an important part of the accelerator of large scientific engineering devices. Its main function is to connect the power source and the superconducting cavity to provide microwave power for the superconducting cavity. An accelerating electric field is established and the energy is transferred to the beam. The bellows material in the high power input coupler assembly is 316L stainless steel, which has poor thermal conductivity and high loss. In order to make up for these shortcomings, copper plating on the inner surface of the bellows can be used to increase the thermal conductivity of the material and reduce high-frequency loss. Moreover, it is nec...

AI Technical Summary

Problems solved by technology

[0003] When electroplating copper, since only the inner wall of the bellows of the coupler is copper-plated, and the outer wall is not copper-plated, a special mold needs to be designed, and the bellows of the coupler itself is corrugated, with deep grooves and raised positions, resulting in The distribution of the electric field at different positions of the bellows is extremely uneven. According to the conventional electroplating method, the copper-plated deep grooves and protrusions on the inner wall of the bellows will produce extremely uneven coatings, and even the deep grooves on the inner wall of the bellows cannot be plated with copper. During the stretching or compression process of the bellows of the coupler, the adhesion of the coating is poor, and it is prone to peeling or coating peeling off, which affects the quality of the electroplating surface

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