A device for preparing ni-sic composite coating on the inner surface of a hollow workpiece

Abstract

The invention discloses a device for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece. A lower water outlet pipe and an upper water outlet pipe which are parallel and are arranged in an up-and-down manner are arranged in a liquid storage tank. After electroplating liquid flowing out of the upper water outlet pipe and electroplating liquid flowing out of the lower water outlet pipe are converged, the mixed electroplating liquid flows towards a sealed electroplating table under the drive force of an electroplating liquid circulation pump, and an electromagnetic flow meter is adjusted to control the volume flow rate of the electroplating liquid flowing towards the sealed electroplating table. After composite electroplating is completed in the sealed electroplating table, the electroplating liquid flows back into the liquid storage tank through a loop. One end of an air discharging pipe is connected with an outlet of a compressed air pump, and the other end of the air discharging pipe is connected in the liquid storage tank. The device is a the sealed and continuous-circulation electroplating device developed based on a traditional non-closed immersion type electroplating device and has the beneficial effects of being reasonable in structure, reliable in operation and convenient to use and operate, and the Ni-SiC composite coating with the good quality can be obtained on the inner surface of the hollow workpiece.

Description

technical field [0001] The invention relates to the field of metal material surface modification technology and equipment, in particular to a cycle electroplating equipment for preparing Ni-SiC composite coatings on the inner surface of hollow workpieces such as rotators. Background technique [0002] At present, construction machinery enterprises basically adopt the traditional immersion electroplating process, that is, the workpiece is completely immersed in the electroplating solution for electroplating. There are many problems in the immersion Ni-SiC electroplating process. The most important thing is that the traditional immersion process cannot completely solve the problem of SiC particle agglomeration in the electroplating solution, resulting in low SiC utilization, unstable coating performance, and low yield. Secondly, only the inner surface of the hollow workpiece is the working surface to be plated, and the rest are non-working surfaces. When the traditional immer...

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Problems solved by technology

According to the continuity equation of fluid mechanics, υ 电镀液流动通道 = υ 镍阳极 *(S 镍阳极 / S 电镀液流动通道 ), where S 镍阳极 and S 电镀液流动通道 are respectively the sum of the cross-sectional area of ​​the nickel anode and the area of ​​the flow channel of the plating solution, υ 镍阳极 and υ 电镀液流动通道 are respectively the flow velocity of the plating solution flowing into the nickel anode and the flow channel of the plating solution, so even if a smaller volume flow rate of 1.280m 3 / h, υ 电镀液流动通道 Still very large, high-speed ejection of plating solution from the hole-shaped plating solution flow channel on the nickel anode impacts scraping and causes damage to the plating surface

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