Phosphating process for surface of elevator guide rail

Abstract

The invention discloses a phosphating process for the surface of an elevator guide rail. The phosphating process comprises the steps of cleaning, phosphating, water washing, drying and optional anti-rust oil coating and film pasting. The phosphating solution is composed of diammonium hydrogen phosphate, zinc nitrate, sodium fluoride and other components, and a rare earth element additive is specially added to optimize the performance of a phosphating film. In the process, the preparation steps and process parameters of the phosphating solution, such as temperature, time and the like, are described in detail. And after phosphorization, washing, drying and anti-rust oil coating are performed to form a uniform phosphating film, so that the corrosion resistance and the wear resistance of the elevator guide rail are enhanced. The process can effectively improve the surface quality of the elevator guide rail and prolong the service life, and is suitable for the field of elevator manufacturing and maintenance.

Description

Technical Field

[0001] The invention belongs to the field of phosphating treatment technology, and specifically discloses a phosphating treatment technology for the surface of an elevator guide rail. Background Art

[0002] In the field of elevator manufacturing, the surface treatment of elevator guide rails has always been an important part of improving the overall performance of elevators and extending their service life. Although traditional elevator guide rail surface treatment methods, such as painting and electroplating, provide protection to a certain extent, they have many shortcomings.

[0003] Although spray painting can form a protective coating on the surface of elevator guide rails, its corrosion resistance is relatively weak, especially in a humid environment, it is easy to peel off, causing the substrate to be directly exposed to the corrosive environment. In addition, the organic solvents used in the spray painting process may also cause environmental pollution, which does not meet modern environmental protection requirements.

[0004] Electroplating is a process that deposits a layer of metal or alloy on the surface of the elevator rail to improve its corrosion resistance and wear resistance. However, the electroplating process is not only energy-intensive and costly, but also has the risk of heavy metal pollution, posing a potential threat to the environment and human health. In addition, the adhesion and uniformity of the electroplating layer are difficult to ensure, and localized shedding or blistering is prone to occur.

[0005] In view of the above shortcomings, phosphating technology has gradually become the preferred solution for the surface treatment of elevator guide rails due to its advantages such as environmental protection, high efficiency and low cost. Phosphating can form a dense phosphate conversion film on the metal surface. The film has good corrosion resistance, wear resistance and adhesion, and can effectively improve the surface quality and service life of the elevator guide rails. However, the existing phosphating process and phosphating solution formula still have some shortcomings. For example, some phosphating solution formulas have a single component, and the formed phosphating film has limited performance, which is difficult to meet the requirements of elevator guide rails for high corrosion resistance, high adhesion and high wear resistance. Summary of the invention

[0006] Based on the shortcomings of the prior art, the present invention discloses a phosphating treatment process for the surface of an elevator guide rail. By optimizing the phosphating solution formula and preparation process, rare earth element additives, nanomaterials, organic corrosion inhibitors and other modifiers are introduced to further improve the performance of the phosphating film and meet the high requirements of the elevator guide rail on the surface quality.

[0007] The present invention includes the following technical solutions:

[0008] A phosphating treatment process for the surface of an elevator guide rail comprises cleaning, phosphating, water washing, drying and optional anti-rust oil coating and film laminating steps, wherein the phosphating solution comprises phosphate, nitrate, nitrite, sulfite and sodium tungstate components, and the temperature of the phosphating solution is controlled between 50-75°C, and the phosphating time is 30-60min.

[0009] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the phosphating solution is made of the following raw materials in parts by weight:

[0010]

[0011] Among them, diammonium hydrogen phosphate ((NH4)2HPO4): as the main source of phosphate, it provides the phosphorus element required for the phosphating reaction; zinc nitrate (Zn(NO3)2): introduces zinc ions to form a phosphating film together with phosphorus elements, enhancing the corrosion resistance and adhesion of the film; sodium fluoride (NaF): as an accelerator, it promotes the phosphating reaction speed, and at the same time helps to refine the phosphating grains and improve the quality of the film layer; sodium nitrite (NaNO2): as an oxidant, it participates in the phosphating reaction and helps to form a dense phosphating film; citric acid (C6H8O7): as a complexing agent, it prevents metal ions from precipitating too quickly and maintains the stability of the solution; sodium tungstate (Na2WO4): as a special additive, it can improve the hardness and wear resistance of the phosphating film; organic corrosion inhibitors can form a protective film on the metal surface to effectively prevent the metal from being further corroded. They can enhance the corrosion resistance and oxidation resistance of the phosphating film, and at the same time improve the bonding strength between the film layer and the substrate; the addition of nanomaterials can significantly improve the microstructure and performance of the phosphating film. Nanoparticles can fill the micropores and defects in the phosphate film, improve the density and hardness of the film, and thus enhance its wear and corrosion resistance; rare earth elements can improve the crystal morphology and distribution of the phosphate film, making it more uniform and dense. Composite additives usually have multiple functions and can simultaneously improve the corrosion resistance, wear resistance and adhesion of the phosphate film.

[0012] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the organic corrosion inhibitor is benzotriazole (BTA) or its derivatives.

[0013] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the nano material is a mixture of nano silicon dioxide and nano aluminum oxide.

[0014] Furthermore, in the above-mentioned phosphating process for the surface of an elevator guide rail, the mass ratio of the nano-silicon dioxide to the nano-aluminum oxide is 1:2.

[0015] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the surfactant is sodium dodecylbenzene sulfonate.

[0016] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the rare earth element additive consists of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:2.

[0017] Furthermore, in the above-mentioned phosphating treatment process for the surface of an elevator guide rail, the phosphating solution is prepared by the following steps:

[0018] 1) Add deionized water into the reactor and heat to 50-60°C;

[0019] 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring while adding:

[0020] 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 min;

[0021] 4) Using sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0;

[0022] 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed;

[0023] 6) Stop heating, wait for the solution to cool to room temperature, filter and remove insoluble matter to obtain a phosphating solution.

[0024] Furthermore, the above-mentioned phosphating treatment process for the surface of an elevator guide rail comprises the following steps:

[0025] Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities;

[0026] Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min;

[0027] Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface;

[0028] Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film;

[0029] Step S5: coating a layer of anti-rust oil on the surface of the phosphating film and applying a protective film to further improve the anti-corrosion performance of the elevator guide rail.

[0030] The invention also discloses an elevator guide rail which is processed by any one of the above processing processes.

[0031] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0032] The invention discloses a phosphating treatment process for the surface of an elevator guide rail

[0033] Through the carefully designed phosphating liquid formula, which contains multiple ingredients such as phosphates, nitrates, nitrites, sulfites and sodium tungstate, as well as the introduction of rare earth element additives, nanomaterials and organic corrosion inhibitors, the phosphating film is made denser and more uniform, which significantly improves the corrosion resistance of the elevator guide rails and extends their service life; the addition of nanomaterials (such as nano-silicon dioxide and nano-alumina) improves the hardness and wear resistance of the phosphating film and reduces the wear of the elevator guide rails during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Comparative test of the thickness (μm) of the phosphating film in Examples 1-3 and Comparative Examples 1-3;

[0035] Figure 2 Comparative test of the discoloration time (s) of the phosphate film in Examples 1-3 and Comparative Examples 1-3;

[0036] Figure 3 Comparative test of neutral salt spray test (h) in Examples 1-3 and Comparative Examples 1-3;

[0037] Figure 4 Wear loss (mg / cm 2 ) comparison test. DETAILED DESCRIPTION

[0038] A phosphating treatment process for the surface of an elevator guide rail comprises the following steps:

[0039] Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities;

[0040] Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min;

[0041] Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface;

[0042] Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film.

[0043] The phosphating solution is made of the following raw materials by weight:

[0044]

[0045]

[0046] The organic corrosion inhibitor is benzotriazole (BTA);

[0047] The nano material is a mixture of nano silicon dioxide and nano aluminum oxide, and the mass ratio of the nano silicon dioxide to the nano aluminum oxide is 1:2;

[0048] The surfactant is sodium dodecylbenzene sulfonate;

[0049] The rare earth element additive is composed of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:2;

[0050] The phosphating solution is prepared by the following steps:

[0051] 1) Add deionized water into the reactor and heat to 50-60°C;

[0052] 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring while adding:

[0053] 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 min;

[0054] 4) Using sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0;

[0055] 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed;

[0056] 6) Stop heating, wait for the solution to cool to room temperature, filter and remove insoluble matter to obtain a phosphating solution.

[0057] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Example 1

[0059] A phosphating treatment process for the surface of an elevator guide rail comprises the following steps:

[0060] Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities;

[0061] Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min;

[0062] Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface;

[0063] Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film.

[0064] The phosphating solution is made of the following raw materials by weight:

[0065]

[0066] The organic corrosion inhibitor is benzotriazole (BTA);

[0067] The nano material is a mixture of nano silicon dioxide and nano aluminum oxide, and the mass ratio of the nano silicon dioxide to the nano aluminum oxide is 1:2;

[0068] The surfactant is sodium dodecylbenzene sulfonate;

[0069] The rare earth element additive is composed of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:2;

[0070] The phosphating solution is prepared by the following steps:

[0071] 1) Add deionized water into the reactor and heat to 50-60°C;

[0072] 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring while adding:

[0073] 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 min;

[0074] 4) Using sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0;

[0075] 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed;

[0076] 6) Stop heating, wait for the solution to cool to room temperature, filter and remove insoluble matter to obtain a phosphating solution.

[0077] Example 2

[0078] A phosphating treatment process for the surface of an elevator guide rail comprises the following steps:

[0079] Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities;

[0080] Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min;

[0081] Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface;

[0082] Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film.

[0083] The phosphating solution is made of the following raw materials by weight:

[0084]

[0085] The organic corrosion inhibitor is benzotriazole (BTA);

[0086] The nano material is a mixture of nano silicon dioxide and nano aluminum oxide, and the mass ratio of the nano silicon dioxide to the nano aluminum oxide is 1:2;

[0087] The surfactant is sodium dodecylbenzene sulfonate;

[0088] The rare earth element additive is composed of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:2;

[0089] The phosphating solution is prepared by the following steps:

[0090] 1) Add deionized water into the reactor and heat to 50-60°C;

[0091] 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring while adding:

[0092] 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 min;

[0093] 4) Using sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0;

[0094] 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed;

[0095] 6) Stop heating, wait for the solution to cool to room temperature, filter and remove insoluble matter to obtain a phosphating solution.

[0096] Example 3

[0097] A phosphating treatment process for the surface of an elevator guide rail comprises the following steps:

[0098] Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities;

[0099] Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min;

[0100] Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface;

[0101] Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film.

[0102] The phosphating solution is made of the following raw materials by weight:

[0103]

[0104] The organic corrosion inhibitor is benzotriazole (BTA);

[0105] The nano material is a mixture of nano silicon dioxide and nano aluminum oxide, and the mass ratio of the nano silicon dioxide to the nano aluminum oxide is 1:2;

[0106] The surfactant is sodium dodecylbenzene sulfonate;

[0107] The rare earth element additive is composed of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:2;

[0108] The phosphating solution is prepared by the following steps:

[0109] 1) Add deionized water into the reactor and heat to 50-60°C;

[0110] 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring while adding:

[0111] 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 min;

[0112] 4) Using sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0;

[0113] 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed;

[0114] 6) Stop heating, wait for the solution to cool to room temperature, filter and remove insoluble matter to obtain a phosphating solution.

[0115] Comparative Example 1

[0116] Compared with Example 2, the phosphating solution in this comparative example does not contain nanomaterials, that is:

[0117] The phosphating solution is made of the following raw materials by weight:

[0118]

[0119] Comparative Example 2

[0120] Compared with Example 2, the phosphating solution in this comparative example does not contain rare earth element additives, that is:

[0121] The phosphating solution is made of the following raw materials by weight:

[0122]

[0123] Comparative Example 3

[0124] Compared with Example 2, the phosphating solution in this comparative example does not contain both nanomaterials and rare earth element additives, that is:

[0125] The phosphating solution is made of the following raw materials by weight:

[0126]

[0127] Test Case

[0128] The surface of the Q355B carbon steel elevator guide rail was phosphating treated using the processes of the above-mentioned Examples 1-3 and Comparative Examples 1-3.

[0129] This test example uses GB11376-89 to evaluate the appearance of the phosphate film; GB4956 regulations are used to test the film thickness of the phosphate film; GB6807-86 copper sulfate drip method is used to test the corrosion resistance of the phosphate film; GB6458-86 neutral salt spray test is used to test the corrosion resistance of the phosphate film;

[0130] Use the following method to test its hardness and wear resistance: Wear resistance: Under a pressure of 1kg, a 3cm×5cm guide rail steel plate test piece is polished back and forth 30 times on 1000 mesh 27cm long sandpaper, and then the wear amount is measured as the basis for wear resistance evaluation.

[0131] The results are shown in Table 1 and Figure 1-4 Shown

[0132] Table 1 Phosphate coating performance comparison test

[0133]

[0134] It can be seen that after using the treatment process of the present invention, especially after adding the rare earth element additive, the phosphating film has a delicate appearance, increased film thickness, excellent corrosion resistance and anti-corrosion performance. After further adding nanomaterials, under the joint action of nanomaterials and rare earth element additives, the wear resistance of the phosphating film can be greatly improved, the surface quality of the elevator guide rails can be effectively improved, and the service life can be extended. It is suitable for the field of elevator manufacturing and maintenance.

[0135] The above are only a few preferred embodiments of the present invention, which are described in a more specific and detailed manner, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A phosphating process for the surface of an elevator guide rail, characterized in that: The method comprises cleaning, phosphating, washing, drying and optional anti-rust oil coating and film laminating steps. The phosphating solution contains phosphate, nitrate, nitrite, sulfite and sodium tungstate components. The temperature of the phosphating solution is controlled between 50-75°C and the phosphating time is 30-60 minutes.

2. The phosphating treatment process for the surface of an elevator guide rail according to claim 1, characterized in that: The phosphating solution is made of the following raw materials by weight: 100 parts of diammonium hydrogen phosphate Zinc nitrate 30-40 parts Sodium fluoride 3-10 parts 3-6 parts of sodium nitrite 10-20 parts of citric acid Sodium tungstate 5-10 parts 5-10 parts of organic corrosion inhibitor 4-8 parts of nanomaterials Surfactant 15-20 parts Rare earth element additives 4-8 parts 500-1000 parts of deionized water.

3. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The organic corrosion inhibitor is benzotriazole (BTA) or its derivatives.

4. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The nano material is a mixture of nano silicon dioxide and nano aluminum oxide.

5. The phosphating treatment process for the surface of an elevator guide rail according to claim 4, characterized in that: The mass ratio of the nano silicon dioxide to the nano aluminum oxide is 1:

2.

6. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The surfactant is sodium dodecylbenzene sulfonate.

7. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The rare earth element additive is composed of cerium nitrate, rhenium chloride and praseodymium acetate in a mass ratio of 3:2:

2.

8. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The phosphating solution is prepared by the following steps: 1) Add deionized water into the reactor and heat to 50-60°C; 2) Add diammonium phosphate, zinc nitrate, sodium fluoride, sodium nitrite, citric acid and sodium tungstate, stirring as you add: 3) Continue to add organic corrosion inhibitor, nanomaterial, surfactant and rare earth element additive, and stir at 200-300 rpm for 10-20 minutes; 4) Use sodium hydroxide and sodium carbonate to adjust the pH value of the solution to between 7.0 and 8.0; 5) Continue stirring for 20-40 minutes to ensure that the solution is fully mixed; 6) Stop heating, wait for the solution to cool to room temperature, filter out insoluble matter, and obtain phosphating solution.

9. The phosphating treatment process for the surface of an elevator guide rail according to claim 2, characterized in that: The following steps are involved: Step S1: Clean the surface of the elevator guide rail workpiece to remove oil, oxide scale and rust to ensure that the surface is clean and free of impurities; Step S2: placing the cleaned elevator guide rail workpiece in a phosphating solution for phosphating treatment; controlling the temperature of the phosphating solution to be between 50-75° C. and the phosphating time to be 30-60 min; Step S3: washing the phosphating elevator guide rail workpiece with water to remove the phosphating solution remaining on the surface; Step S4: drying the washed elevator guide rail workpiece to remove surface moisture and form a uniform phosphating film; Step S5: Optionally, a layer of anti-rust oil is applied on the surface of the phosphating film, and the film is applied for protection to further improve the anti-corrosion performance of the elevator guide rail.

10. An elevator guide rail, characterized in that: The method is treated by the treatment process according to any one of claims 1 to 9.

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