Method for plating chromium on molybdenum core rod

A core rod, rectangular technology, applied in the field of chemical electroplating, molybdenum core rod electrochrome plating, can solve the problems of chromium layer peeling, thick ends of molybdenum core rod, chromium layer is not dense, etc., to achieve adhesion without peeling, Good process consistency and smooth surface effect

Inactive Publication Date: 2010-08-25
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the chromium plating on the surface of the molybdenum core rod is very unstable. There are often defects such as no chromium layer on the surface, no dense chromium layer, poor adhesion, peeling of the chromium layer, and thick ends of the plated molybdenum core rod. The pass rate and precision of the line are difficult to meet the needs of traveling wave tubes

Method used

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  • Method for plating chromium on molybdenum core rod
  • Method for plating chromium on molybdenum core rod

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Embodiment Construction

[0022] As can be seen from Figure 1, the method for chrome plating of this molybdenum core rod specifically includes:

[0023] 1) The two ends of the metal wire 2 are respectively tightly wound on the two ends of the molybdenum core rod 1, and fully chemically cleaned;

[0024] 2) Turn on the electroplating power supply, immediately connect the molybdenum core rod 1 to the negative electrode of the electroplating power supply and put it into an electroplating tank containing a chromium plating solution to start electroplating. The material of the anode is a lead-antimony alloy containing 10% antimony;

[0025] 3) During electroplating, the temperature of the chromium plating solution is controlled within the range of 40°C-70°C, and the power cannot be cut off during the electroplating process;

[0026] 4) After the electroplating is finished, take out the molybdenum core rod 1 first, and then turn off the electroplating power supply.

[0027] The composition of the chrome pla...

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Abstract

The invention discloses a method for plating chromium on a molybdenum core rod, which comprises the following steps: 1) closely winding the two ends of a metal wire (2) on the two ends of the molybdenum core rod (1) and fully cleaning the molybdenum core rod by a chemical method; 2) turning on a plating power supply, immediately connecting the molybdenum core rod (1) with the negative electrode of the plating power supply and placing the molybdenum core rod into a plating tank in which chromium plating solution is accommodated so as to start to electroplate, wherein the anode is made of the lead-antimony alloy containing 10 percent of antimony; 3) controlling the temperature of the chromium plating solution within the range from 40 to 70 DEG C during the electroplating, wherein the power cannot be interrupted during the electroplating process; and 4) taking the molybdenum core rod (1) out and then turning off the plating power supply after the electroplating. The method for plating the chromium ensures bright and clean, compact and non-scaling surface with high adhesion of the metal chromium layer plated on the molybdenum core rod by selecting the optimal plating process, matching the shape of a workpiece with that of the anode and completely cleaning the molybdenum core rod before plating so as to meet the winding requirements of a helix traveling-wave tube on a helix line.

Description

technical field [0001] The invention relates to the technical field of chemical electroplating, in particular to the field of chromium electroplating on a molybdenum core rod used for helical winding in a helical traveling wave tube. Background technique [0002] Helical TWT is a wide-band, high-gain device, widely used in military equipment such as space navigation, communication and data transmission, radar and electronic countermeasures. The helix is ​​the key component of the helix traveling wave tube. It is wound on the chrome-plated molybdenum core rod processed by a grinder through a molybdenum strip, and then shaped at a high temperature in a vacuum furnace, and then the surface of the helix is ​​ground. , to reach the required size, and then remove the chromium layer on the surface of the molybdenum core rod by chemical treatment, and the processed helix can be easily removed from the molybdenum core rod. Therefore, the quality of the chrome-plated layer on the sur...

Claims

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Application Information

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IPC IPC(8): C25D7/00C25D3/04C23G1/10
Inventor 吴华夏方卫肖兵李锐李康伟
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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