Chromium plating solution impurity removal device

Abstract

The utility model relates to the field of metal electroplating, and discloses a chromium plating solution impurity removal device which comprises an outer tank body and an inner tank body, the inner tank body is fixed in the outer tank body, a plurality of mounting holes are formed in the side wall of the inner tank body, polytetrafluoroethylene electrolytic cloth is mounted in the mounting holes, and drain valves are arranged at the bottoms of the outer tank body and the inner tank body. A liquid inlet and an overflow port are formed in a groove opening of the outer groove body. According to the utility model, the teflon electrolytic cloth is adopted to solve the problems that the fluorine-containing chromium plating solution is high in impurity content after being used for a long time, and the service life is short due to the adoption of a biscuiting cylinder or a ceramic diaphragm cylinder for removing impurities in the chromium plating solution in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of metal electroplating, in particular to a device for removing impurities from chromium plating liquid. Background Art

[0002] During the hard chrome plating process, the mold substrate is corroded by hexavalent chromic acid, resulting in iron ions and organic matter remaining in the chrome plating solution. In particular, molds in the automotive industry and drawing molds are all made of cast iron or cast steel, which are more likely to cause an increase in iron ions in the chrome plating solution. Due to the limitations of automotive drawing molds, it is impossible to meet the requirement that the anode area is larger than the cathode area. In long-term electroplating, the trivalent chromium rises particularly quickly. When the trivalent chromium, iron ions and other organic matter reach a certain concentration, the adhesion of the chrome plating layer is greatly affected, resulting in aging of the chrome plating solution and inability to continue to use it. In order to reduce the impurity components of the chrome plating solution, there is a method in the prior art to use ceramic diaphragms and bisque cylinder electrolysis to reduce the impurity components in the chrome plating solution to achieve energy saving and environmental protection.

[0003] The electrolysis principle of ceramic diaphragm is: the trivalent chromium in the plating solution is oxidized to hexavalent chromium at the anode during the electrolysis process and can be recycled, and the trivalent chromium and iron ion impurities reduced by the cathode remain in the ceramic diaphragm tube, thereby reducing the trivalent chromium and iron ion components in the chromium plating solution. Use anode: cathode = 5:1, add 10% dilute sulfuric acid solution to the ceramic diaphragm tube, put in the cathode lead rod, and electrolyze at a current of 50-80A for each ceramic diaphragm tube. Electrolyze continuously for 5-10 hours, clean up the impurities in the barrel, and then electrolyze again.

[0004] The principles of electrolysis of unglazed cylinder and ceramic diaphragm are the same, but the materials are different. The unglazed cylinder is fired at high temperature with high-quality clay, while the ceramic diaphragm is mainly made of ceramic.

[0005] The advantages include: the ceramic diaphragm and bisque fired cylinder have a significant effect on reducing trivalent chromium in fluorine-free chromium plating liquid, which is suitable for the electroplating of forged steel materials and plastic electroplating industries, and the normal service life is about two years. The disadvantages are: the tank body is small in size and needs to be replaced frequently. Fluorine has strong corrosion to ceramics. For the automotive mold industry, in order to obtain an excellent chrome plating layer on the surface of cast iron or cast steel, fluoride components must be added to the chrome plating liquid, which seriously shortens the service life of the ceramic diaphragm and bisque fired cylinder. The normal service life is only about 3 months. In addition, the scrapped ceramic diaphragm and bisque fired cylinder are large in size, and the chrome plating liquid adsorbed on the cylinder wall is difficult to clean out, and the cost of solid waste treatment is high. Utility Model Content

[0006] The utility model aims to provide a chrome plating liquid impurity removal device to solve the problem that the fluorine-containing chrome plating liquid has a large amount of impurities after long-term use, and the prior art uses a bisque-fired cylinder or a ceramic diaphragm cylinder to remove impurities from the chrome plating liquid, which has a short service life.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a chrome plating liquid impurity removal device, comprising an outer tank body and an inner tank body, the inner tank body is fixed in the outer tank body, a plurality of mounting holes are arranged on the side wall of the inner tank body, polytetrafluoroethylene electrolytic cloth is installed in the mounting holes, the outer tank body and the bottom of the inner tank body are both provided with drain valves, and the notch of the outer tank body is provided with a liquid inlet and an overflow port.

[0008] Preferably, as an improvement, the outer trough body and the inner trough body are both rectangular, and the depth of the inner trough body is smaller than that of the outer trough body.

[0009] Preferably, as an improvement, the mounting holes are located on the two long side walls of the inner tank body, and each long side wall is provided with two mounting holes, and the mounting holes are rectangular.

[0010] Preferably, as an improvement, the polytetrafluoroethylene electrolytic cloth and the side wall of the inner tank body are locked and sealed by polytetrafluoroethylene gaskets and fasteners.

[0011] Preferably, as an improvement, the length of the inner tank body is more than 90% of the length of the outer tank body.

[0012] Preferably, as an improvement, the length of the mounting hole is 40%-45% of the length of the inner slot body.

[0013] Preferably, as an improvement, the width of the inner tank body is more than 90% of the width of the outer tank body.

[0014] Preferably, as an improvement, a crossbeam is fixed to the top of the inner tank body, and the crossbeam is mounted on the top of the outer tank body.

[0015] The principle and advantages of this scheme are: in actual application, the outer tank body is filled with chrome plating liquid and connected to the anode, the inner tank body is filled with electrolyte, the electrolyte contains 5% to 10% chrome plating stock solution, the cathode lead rod is placed in the inner tank body and current is passed for electrolysis, the trivalent chromium in the chrome plating liquid is oxidized to hexavalent chromium on the anode during the electrolysis process and can be recycled, the trivalent chromium and impurities reduced by the cathode remain in the inner tank body, thereby reducing the trivalent chromium and iron ion components, and the tetrafluoroethylene electrolytic cloth on the inner tank body can effectively prevent the corrosion of the fluorine-containing chrome plating liquid. The volume of the inner tank body is larger than that of the outer tank body, and the relative capacity is large. The water can be changed after continuous electrolysis for 48-72 hours. The large current has little effect on the tetrafluoroethylene electrolytic cloth, and it will not be damaged due to excessive current. Under the same conditions, a large current can be used to accelerate the degradation rate, and the treatment rate is higher. The electrolyte uses 5% to 10% chrome plating stock solution, which is less corrosive and safe for personnel to operate. If it leaks, it will have no effect on the chrome plating liquid. The PTFE electrolytic cloth is flat as a whole, occupies a small space, is easy to clean, and has convenient solid waste treatment. This structure is used to remove impurities from chrome plating liquid, and its service life can reach more than 24 months, which is significantly improved compared to the ceramic diaphragm cylinder or bisque cylinder technology in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of an embodiment of the utility model.

[0017] Figure 2 for Figure 1 AA section view. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] The reference numerals in the drawings of the specification include: outer tank body 1, inner tank body 2, overflow port 3, drain valve 4, polytetrafluoroethylene electrolytic cloth 5, titanium bolt 6, polytetrafluoroethylene pad 7, lifting ear 8, crossbeam 9, liquid inlet 10, and mounting hole 11.

[0020] The embodiment is basically as shown in the attached Figure 1 , Figure 2 As shown: a chrome plating liquid impurity removal device, including an outer tank body 1 and an inner tank body 2, both of which are made of titanium plates welded, the outer tank body 1 is a rectangle of 2800*600*600mm in size, the inner tank body 2 is a rectangle of 2600*600*200mm in size, a crossbeam 9 is welded and fixed on the top of the inner tank body 2, the crossbeam 9 is erected on the top of the outer tank body 1 to fix the inner tank body 2 in the outer tank body 1, and a lifting lug 8 is threadedly connected on the crossbeam 9 to facilitate the lifting of the inner tank body 2. Four mounting holes 11 are provided on the side wall of the inner tank body 2, the mounting holes 11 are located on the two long side walls of the inner tank body 2, and two mounting holes 11 are provided on each long side wall, and the mounting holes 11 are a rectangle of 1160*360mm in size. A plurality of threaded holes are arranged on the inner side wall of the inner tank body 2 outside the mounting hole 11, and a tetrafluoroethylene electrolytic cloth 5 covering the mounting hole 11 is installed through a titanium bolt 6, and a tetrafluoroethylene pad 7 is arranged between the tetrafluoroethylene electrolytic cloth 5 and the side wall of the inner tank body 2 for sealing. A drain valve 4 is arranged at the bottom of the outer tank body 1 and the inner tank body 2, and a liquid inlet 10 and an overflow port 3 are arranged at the notch of the outer tank body 1.

[0021] The specific implementation process is as follows: the outer tank body 1 is filled with chromium plating solution, the inner tank body 2 is filled with electrolyte containing 5% to 10% chromium plating stock solution, the outer tank body 1 is connected to the anode, and the cathode lead rod is placed in the inner tank body 2. After power is turned on, the trivalent chromium in the chromium plating solution is oxidized to hexavalent chromium on the anode during the electrolysis process for recycling, and the trivalent chromium and iron ion impurities reduced by the cathode remain in the inner tank body 2, thereby reducing the trivalent chromium and iron ion components. The tank body capacity used in this device is large, and the water can be changed after continuous electrolysis for 48-72 hours. The use of tetrafluoroethylene electrolytic cloth 5 can effectively prevent the corrosion of fluorine-containing chromium plating solution, thereby ensuring the service life of the device, and can effectively complete the removal of impurities in the chromium plating solution within 24 months. In addition, it is less affected by large currents, and large currents can be used to accelerate the degradation rate. The tetrafluoroethylene electrolytic cloth 5 occupies a small space, is easy to clean, and is also convenient for the treatment of the generated solid waste.

[0022] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A chrome plating liquid impurity removal device, characterized in that: It includes an outer tank body and an inner tank body. The inner tank body is fixed in the outer tank body. A plurality of mounting holes are arranged on the side wall of the inner tank body. A polytetrafluoroethylene electrolytic cloth covering the mounting holes is arranged on the inner tank body. Drain valves are arranged at the bottom of the outer tank body and the inner tank body. A liquid inlet and an overflow port are arranged at the notch of the outer tank body.

2. A chrome plating liquid impurity removal device according to claim 1, characterized in that: The outer tank body and the inner tank body are both rectangular, and the depth of the inner tank body is smaller than that of the outer tank body.

3. A chrome plating liquid impurity removal device according to claim 2, characterized in that: The mounting holes are located on the two long side walls of the inner tank body, and each long side wall is provided with two mounting holes, and the mounting holes are rectangular.

4. A chrome plating liquid impurity removal device according to claim 3, characterized in that: The tetrafluoroethylene electrolytic cloth and the side wall of the inner tank body are locked and sealed by tetrafluoroethylene gaskets and fasteners.

5. The chromium plating liquid impurity removal device according to claim 4, characterized in that: The length of the inner tank body is more than 90% of the length of the outer tank body.

6. A chrome plating liquid impurity removal device according to claim 5, characterized in that: The length of the mounting hole is 40%-45% of the length of the inner slot body.

7. The chromium plating liquid impurity removal device according to claim 6, characterized in that: The width of the inner tank body is more than 90% of the width of the outer tank body.

8. The chromium plating liquid impurity removal device according to claim 7, characterized in that: A crossbeam is fixed on the top of the inner tank body, and the crossbeam is mounted on the top of the outer tank body.

Images