Technology for manufacturing black chromium coating for rotating anode X-ray tube

Abstract

The invention belongs to the field of plating of metal materials, in particular to technology for manufacturing a black chromium coating on a rotating anode X-ray tube. The plating solution is prepared, and the black chromium coating is directly deposited on a rotor matrix of the rotating anode X-ray tube through plating, without a middle transition plating layer. The plating solution is prepared from the following components by weight: 200 to 400 grams of chromium trioxide, 2 to 4 grams of barium carbonate, 15 to 25 grams of boric acid, 5 to 15 grams of sodium nitrate, 0.05 to 0.15 milliliters of fluosilicic acid and 1,000 milliliters of ionized water. The technology has the advantages that: compared with the prior art, the black chromium coating needs no middle transition plating layer and can be directly deposited on the rotor matrix; and the black chromium coating is applied to a vacuum state and has excellent high temperature resistance, can resist the temperature of between 600 and 700 DEG C, does not foam or wrinkle, has high bonding strength and does not fall off.

Description

technical field [0001] The invention belongs to the field of plating of metal materials, and specifically refers to a manufacturing process of a black chromium plating of a rotating anode X-ray tube. Background technique [0002] The rotating anode X-ray tube is a high-vacuum electric vacuum device. Its working principle is to apply a high voltage (generally 125-150kV) to the positive and negative terminals of the X-ray tube, and the electron beam emitted by the cathode is under the action of a high-vacuum high-voltage electric field. , X-rays are generated by electron bombardment on the anode target surface (the target surface material is generally tungsten), but X-rays only account for about 1% of the electron energy, while 99% are converted into heat. Since the X-ray tube is a vacuum device, the heat conduction in the tube is quite unsatisfactory. [0003] In order to conduct a large amount of heat generated by the rotating anode X-ray tube to the insulating medium oil l...

AI Technical Summary

Problems solved by technology

Common black chrome coatings are generally used at room temperature, and only serve the functions of surface decoration and shading. They are not suitable for high temperature resistance and vacuum working conditions required by the black chrome coating on the anode rotor of rotating anode X-ray tubes.