Preparation process of surface phosphating oil-absorbing corrosion-resistant film layer of hydraulic oil container

Abstract

The invention provides a preparation process of a surface phosphating oil-absorbing corrosion-resistant film layer of a hydraulic oil container. The preparation process comprises the following steps: pre-cleaning the container: purging dirt on the surface of the container by using pure compressed air; degreasing and cleaning: immersing the container into a chemical degreasing solution, and carrying out dynamic flushing, water washing I, neutralization cleaning, water washing II, phosphorization and the like; the method comprises the following steps: immersing a hydraulic oil container into a metal-containing phosphate solution to continuously form a high-crystal corrosion-resistant film layer; by utilizing the physical characteristic that phosphating film-forming crystals naturally grow and accumulate to form tiny gap holes which are extremely easy to absorb and store oil, the anti-corrosion technical thought and method that the anti-corrosion phosphating film layer absorbs oil to seal the exposed metal surface are adopted; the problem that hydraulic control is out of control due to corrosion of a steel substrate caused by oil-soluble micro-water or falling of an oil-resistant organic coating and failure and falling of an oil-resistant protective layer caused by quality defects in the coating construction process is thoroughly solved.

Description

Technical Field

[0001] The invention relates to a phosphating process, in particular to a process for preparing a surface phosphating oil-absorbing and corrosion-resistant film layer of a hydraulic oil container. Background Art

[0002] Hydraulic oil storage containers are usually made of ordinary carbon steel at home and abroad. The steel surface in the box that contacts the oil is usually treated with oil-resistant coating for isolation and anti-corrosion coating. However, the traditional oil-resistant coating process cannot guarantee the stability and effectiveness of the oil-resistant coating quality when treating the steel surface in the box for anti-corrosion. It is easy for the inner wall of the hydraulic oil container to be corroded by various ionized substrates, resulting in large and small pieces of the oil-resistant coating occasionally falling off to varying degrees. The flaky paint film enters the pipeline and various control systems with the hydraulic oil, causing local embolism and blockage of the hydraulic oil pipeline, valve body control and galvanic sensor, controller failure, and other serious quality problems, resulting in equipment operation failures and production accidents, which can easily cause major safety hazards in production. In order to ensure that the hydraulic system of key equipment operates absolutely safely, stably and reliably, it is necessary to optimize, innovate and improve the existing oil-resistant coating process methods. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned background technology, the present invention provides a process for preparing a surface phosphating oil absorption and corrosion resistant film layer of a hydraulic oil container.

[0004] A process for preparing a surface phosphating oil absorption and corrosion resistant film layer of a hydraulic oil container comprises the following steps:

[0005] S1. Container pre-cleaning: Use pure compressed air to blow away dirt on the container surface;

[0006] S2, degreasing and cleaning: immerse the container in a chemical degreasing solution for dynamic washing;

[0007] S3, Water washing I: Wash the inside and outside of the container with flowing pressure water;

[0008] S4, pickling: immerse the container in the pickling solution to remove rust oxides on the surface of the steel;

[0009] S5, neutralization cleaning: use alkaline liquid to neutralize and rinse the inner and outer walls of the container;

[0010] S6, water washing II: wash the inner and outer walls of the container with flowing pressure water;

[0011] S7, crystal nucleus activation: immerse the container in the surface conditioning agent to perform active adjustment and repair on the crystal phase of the exposed metal surface of the container;

[0012] S8, phosphating: immerse the container in a metal phosphate solution containing Zn, Mn, Ni, and Fe to continuously form a high-crystalline, corrosion-resistant, oil-absorbing film layer; control the total acidity: 35-55Pt, free acid 2-4Pt, temperature: 35±5℃, time: 50-60min;

[0013] S9, water washing III: rinse the container with water and wash with high pressure water;

[0014] S10. Water washing IV: rinse the container with hot water; the water temperature is: 90±5℃.

[0015] Optionally, in step S2, the hydraulic oil container is hoisted to the surface treatment production line and immersed in a chemical degreasing tank, and the degreasing solution is cleaned by dynamic internal flushing; wherein the alkalinity of the degreasing solution is controlled to be: FAL18-30Pt, temperature: 45±5°C, time: 20-30min.

[0016] Optionally, in step S4, the steel surface is immersed in an acid solution tank to remove rust oxides, activate the crystal phase on the steel surface, and control the BF78BⅡ additive content in the pickling solution to 5-8% and the acidity HCL content to 10-20%.

[0017] Optionally, in step S5, an alkaline neutralizing solution is used to clean the inner wall of the container, and the sodium carbonate solution in the alkaline neutralizing solution is 10 to 18 g / L.

[0018] Optionally, in step S7, the exposed metal crystal phase surface is repaired by active adjustment, and the surface adjustment agent is an alkaline solution of 5 to 10 g / L.

[0019] Optionally, the thickness of the prepared oil-absorbing and corrosion-resistant phosphating film layer is not less than 8±2um.

[0020] Optionally, the hydraulic oil container is a hydraulic oil tank or a hydraulic oil tank or a hydraulic oil pipe or a hydraulic oil bag.

[0021] The beneficial effects of the present invention are as follows: the present invention immerses the hydraulic oil container in a metal phosphate solution to continuously form a high-crystalline corrosion-resistant film layer; utilizes the physical properties of tiny gaps and holes formed by the natural growth and accumulation of phosphating film-forming crystals, which are extremely easy to absorb and store oil, and adopts the anti-corrosion technical ideas and methods of the corrosion-resistant phosphating film layer to absorb oil and seal the exposed metal surface, so as to completely solve the problem of hydraulic control loss caused by corrosion of the steel substrate due to oil-soluble micro-water or the shedding of the oil-resistant organic coating caused by quality defects in the coating construction process, and the failure and shedding of the oil-resistant protective layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0024] like Figure 1 The process for preparing the surface oil absorption phosphating oil absorption corrosion resistant film layer of the hydraulic oil container shown includes:

[0025] Step (1), according to the manufacturing structure, the hidden parts of the hydraulic container such as the abdominal cavity, pipelines, inner flange, etc. are pre-cleaned by mechanical manual work for welding slag, dust, blocky oil stains and other surface contaminants, and then blown clean with pure compressed air; (For the convenience of expression, the "container" in the following content refers only to the "hydraulic container")

[0026] Step (2), hoist the container to the surface treatment production line and immerse it in the chemical degreasing tank, immerse the container in the chemical degreasing solution, and perform dynamic washing. The liquid concentration is controlled to be FAL18-30Pt, the temperature is 45±5℃, and the time is 20-30min;

[0027] Step (3), flushing the hydraulic container with water inside and outside the container under flowing pressure;

[0028] Step (4), immersing the container in an acid solution tank to remove rust oxides on the surface of the steel material, activating the crystal phase on the surface of the steel material, and controlling the BF78BⅡ additive content in the pickling solution to 5-8% and the acidity HCL content to 10-20%;

[0029] Step (5), flushing the abdominal cavity or inner and outer walls of the pipe of the container with running water, and then neutralizing and cleaning with an alkaline solution, wherein the sodium carbonate solution in the alkaline neutralization solution is 10 to 18 g / L;

[0030] Step (6), flush the inner and outer walls of the container with flowing pressurized water.

[0031] Step (7), immersing the container in a surface conditioning agent to perform active conditioning and repair on the crystal phase of the exposed metal surface of the container; wherein the alkaline solution surface conditioning agent is 5 to 10 g / L;

[0032] Step (8), preparation of oil-absorbing phosphating film layer: immersing the container in a metal phosphate solution containing Zn, Mn, N, and iFe to continuously form a high-crystalline, corrosion-resistant, oil-absorbing film layer; wherein the metal phosphate solution controls the total acidity to 35-55Pt, the free acid to 2-4Pt, the temperature to 35±5°C, and the time to 50-60min;

[0033] Step (9), water washing III: rinsing the container with water and washing with high pressure water;

[0034] Step (10), water washing IV: rinse the container with hot water; the water temperature is: 90±5°C;

[0035] Step (11), drying the container with hot air to make it completely dry;

[0036] Step (12), checking that the quality of the oil-absorbing phosphating film on the inner wall of the container is continuous and uniform, and the thickness of the film is not less than 8±2 um;

[0037] Step (13), the oil-absorbing phosphating film layer is completely infiltrated with hydraulic anti-rust oil, the oil film is continuous and uniform, and the oil absorption is full;

[0038] Step (14), using the fluorescent lamp method to comprehensively detect the oil film-free leak points;

[0039] Step (15), inspect qualified finished products, seal them with plastic film, and transport them to storage.

[0040] The hydraulic oil container mentioned above can be a hydraulic oil box, a hydraulic oil tank, a hydraulic oil pipe, a hydraulic oil bag, etc., and the above hydraulic oil containers all fall within the protection scope of the present invention.

[0041] The key technical point of the present invention is to prepare an oil-absorbing and corrosion-resistant phosphating conversion film layer on the steel surface of various hydraulic oil storage equipment, boxes, pipelines, air inclusions, etc., completely replacing the risky polymer oil-resistant coating isolation protection method, and completely eliminating the hydraulic equipment control and equipment safety problems caused by the organic polymer film layer in the hydraulic oil tank pipeline due to substrate corrosion or occasional coating shedding due to coating quality.

[0042] On the hydraulic oil contact surface, after the steel is treated with phosphating (production line chemical reaction conversion film), a firm, complete, dense, oil-absorbing, and corrosion-resistant phosphating conversion film layer can be grown on its exposed active metal surface. The chemical reaction formula is: (M(H2PO4)2→MHPO4+H3PO4, 3MHPO4→M3(PO4)2+H3PO4). The quality control of its production process is the core node of this process technology. During the film preparation process, the temperature, time, and hydrodynamics of each chemical solution of the production line should be controlled at any time, and the total alkalinity (FAL) of the degreasing solution, the total acidity (FA) of the rust removal oxide solution, the free alkalinity (TAL) of the crystal nucleus activation surface adjustment solution, and the total acid (TA), free acid (FA), and gas point (AC) of the corrosion-resistant phosphating solution should be controlled to prevent the solution from getting out of control and affecting the quality of the oil-absorbing phosphating film. Therefore, the film-forming production agent should be regularly monitored, recorded, and adjusted every shift, and the agent should be replaced and supplemented regularly according to the production control process. In order to realize the change process smoothly, the production process should strictly prevent the cross-liquid and mixing of the agents in the production line to ensure the preparation quality of the oil-absorbing phosphating anti-corrosion film layer. After the continuous oil-absorbing corrosion-resistant film layer is prepared, the film layer is fully soaked with HB infiltration-type hydraulic special anti-rust oil, so that the natural pores and gaps of the film layer are completely filled and saturated, and the special anti-rust oil is adsorbed, so that the matrix, the oil-absorbing film layer and the water-gas corrosion medium are completely isolated, forming a very stable and firm corrosion-resistant passive phosphating oil seal conversion film layer, until the equipment assembly hydraulic oil is fully injected, the corrosion-resistant oil-absorbing film layer is completely immersed in oil and sealed in the equipment, so that the corrosion-resistant film layer reaches a completely firm and stable state, and completely eliminates the process technology defects of the original oil-proof organic polymer coating or the oil dissolution and oil-resistant coating falling off, which leads to the hidden dangers and risks of safe control operation of hydraulic equipment. In addition, this process saves a lot of manpower and expenses for daily maintenance of hydraulic facilities and equipment, and has significant social benefits.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing a surface phosphating oil absorption and corrosion resistant film layer of a hydraulic oil container, characterized by: The following steps are involved: S1. Container pre-cleaning: Use pure compressed air to blow away dirt on the container surface; S2, degreasing and cleaning: immerse the container in a chemical degreasing solution for dynamic washing; S3, Water washing I: Wash the inside and outside of the container with flowing pressure water; S4, pickling: immerse the container in the pickling solution to remove rust oxides on the surface of the steel; S5, neutralization cleaning: use alkaline liquid to neutralize and rinse the inner and outer walls of the container; S6, water washing II: wash the inner and outer walls of the container with flowing pressure water; S7, crystal nucleus activation: immerse the container in the surface conditioning agent to perform active adjustment and repair on the crystal phase of the exposed metal surface of the container; S8, phosphating: immerse the container in a metal phosphate solution containing Zn, Mn, Ni, and Fe to continuously form a high-crystalline, corrosion-resistant, oil-absorbing film layer; control the total acidity: 35-55Pt, free acid 2-4Pt, temperature: 35±5℃, time: 50-60min; S9, water washing III: rinse the container with water and wash with high pressure water; S10. Water washing IV: rinse the container with hot water; the water temperature is: 90±5℃.

2. The process for preparing the surface phosphating oil absorption and corrosion resistant film layer of the hydraulic oil container according to claim 1 is characterized in that: In step S2, the hydraulic oil container is hoisted to the surface treatment production line and immersed in the chemical degreasing tank, and the degreasing solution is cleaned by dynamic internal flushing; wherein the alkalinity of the degreasing solution is controlled to be: FAL18~30Pt, the temperature is: 45±5℃, and the time is: 20~30min.

3. The process for preparing the surface phosphating oil absorption and corrosion resistant film layer of the hydraulic oil container according to claim 1 is characterized in that: In step S4, the steel surface is immersed in an acid solution tank to remove rust oxides, and the crystal phase on the steel surface is activated. The BF78BⅡ additive content in the pickling solution is controlled to be 5-8%, and the acidity HCL content is 10-20%.

4. The process for preparing the surface oil absorption phosphating film layer of the hydraulic oil container according to claim 1 is characterized by: In step S5, an alkaline neutralizing solution is used to clean the inner wall of the container, and the sodium carbonate solution in the alkaline neutralizing solution is 10 to 18 g / L.

5. The process for preparing the surface phosphating oil absorption and corrosion resistant film layer of the hydraulic oil container according to claim 1 is characterized by: In step S7, the exposed metal crystal phase surface is repaired by active adjustment, and the surface adjustment agent is an alkaline solution of 5-10 g / L.

6. The process for preparing the surface phosphating oil absorption and corrosion resistant film layer of the hydraulic oil container according to claim 1 is characterized by: The thickness of the prepared oil-absorbing and corrosion-resistant phosphating film layer is not less than 8±2um.

7. The process for preparing the surface phosphating oil absorption and corrosion resistant film layer of the hydraulic oil container according to any one of claims 1 to 6, characterized in that: The hydraulic oil container is a hydraulic oil box or a hydraulic oil tank or a hydraulic oil pipe or a hydraulic oil bag.

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