Device and method for hard chrome plating of inner wall of straight cylinder part

A technology of hard chrome plating and parts, which is applied in the field of hard chrome plating on the inner wall of straight parts and hard chrome plating on the inner wall of straight parts. It can solve the problems of slow bath circulation, uneven crystallization of the surface of the chrome plating layer, and excessive local temperature rise. To achieve the effect of speeding up the circulation of the bath solution, solving the unevenness of the coating, and improving the quality of the product

Inactive Publication Date: 2015-02-25
HEFEI JIANGHANG AIRCRAFT EQUIP CORP LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] Solve the problem of uneven crystallization of the surface of the chrome plating layer caused by the device for hard chrome plating on the inne

Method used

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  • Device and method for hard chrome plating of inner wall of straight cylinder part

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Embodiment Construction

[0021] 1. Before electroplating, use gasoline to clean the inner and outer surfaces of the electroplated workpiece 1. After degreasing, wash with hot water. After rinsing with tap water, the surface has no water film before putting it into the bath that has been heated and meets the technical requirements to preheat for 1 to 2 minutes. .

[0022] 2. Connect the prepared acid-resistant pump before lowering the tank to circulate the bath liquid. Since the chrome-plating bath liquid is very toxic and will cause great harm to the human body, the power of the acid-resistant pump should not be too large, otherwise it will cause injury due to the too far lift of the bath liquid. And the operator should be selected according to the size of the inner diameter of the straight cylinder. The power of the acid-resistant pump adopted in the present invention is 55kw, the rotating speed is 2900r / h, the lift is 11m, and the suction lift is 3m. The water outlet of the pump is connected to the...

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Abstract

The invention belongs to electrodeposited chromium processing technology of the inner wall of straight cylinder workpiece, and relates to a device and method for hard chrome plating of the inner wall of a straight cylinder part. The device comprises the following parts: an anode cable 3, which is connected with the anode rod 7 for electroplating; a polyvinyl chloride protective film 2, which coats the anode rod placed on the non-chrome plating part of the inner wall; a cathode cable, which is connected to the whole straight cylinder part 1; an inner wall of the straight cylinder 6; an upper anode fixed protection device (organic glass) 4; a lower anode fixed protection device (organic glass) 8; and a screw holes 9, which is connected with an outlet of an acid resistant pump. The device meets the environmental requirements of the inner wall of the straight cylinder in a circular liquid groove, realizes the routine operation process of the electrodeposited chromium of the inner wall of the straight cylinder. The invention relates to a chromium plating method for solving the problem of uneven crystallization of chrome plating layer of the inner wall of the straight cylinder part and for protecting the device. The invention can solve the problem of nonuniform crystallization of chrome plating layer surface caused by fast local heating due to slow cycling of groove liquid in the chrome plating process, and provides a device for protecting the parts without chrome plating.

Description

technical field [0001] The invention belongs to the electroplating and chrome plating processing technology, and relates to a device for hard chrome plating on the inner wall of straight cylindrical parts and a method for hard chrome plating on the inner wall of straight cylindrical parts. Background technique [0002] Chromium is a kind of silver-white metal with microstrip blue, relative atomic mass 51.99, density 6.98~7.21g / cm2, metal chromium is easily passivated in the air, and a very thin passivation film is formed on the surface, it is a kind of Precious metal material with high corrosion resistance. The chromium plating layer has high hardness and good heat resistance. When heated below 500°C, its gloss and hardness will not change significantly. When the temperature is higher than 500°C, it will start to oxidize and change color, and the hardness will begin to decrease when the temperature is higher than 700°C. The friction coefficient of the chromium plating layer...

Claims

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Application Information

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IPC IPC(8): C25D7/04C25D17/00
Inventor 俞志文江涌
Owner HEFEI JIANGHANG AIRCRAFT EQUIP CORP LTD
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