Surface treatment method for improving wear resistance and corrosion resistance of steel component

Abstract

The invention relates to the technical field of surface treatment, and discloses a surface treatment method for improving wear resistance and corrosion resistance of a steel member, which comprises the following steps: (1) pretreating the member, including alkali washing, primary rinsing, acid pickling, secondary rinsing, drying and preheating; (2) performing permeation treatment on the component treated in the step (1) by using a carbon-nitrogen-lanthanum-yttrium ion permeation agent; (3) activating the component treated in the step (2) by using a lanthanum-yttrium activating permeating agent; (4) performing permeation treatment on the component treated in the step (3) by using an oxygen ion permeation agent; and (5) after the component treated in the step (4) is cooled and cleaned, sealing treatment is conducted through a sealing agent, and oil immersion is conducted. According to the surface treatment method provided by the invention, the treatment temperature is mild, a component matrix cannot deform in the treatment process, a compound layer and a diffusion layer with certain thicknesses are formed, and the component is composed of a carbon-nitrogen compound of metal elements and a solid solution of nitrogen in iron, so that the component has relatively high hardness and corrosion resistance.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment, in particular to a surface treatment method for improving the wear resistance and corrosion resistance of steel components. Background Art

[0002] In industrial applications, the corrosion resistance and wear resistance of steel components are key performance indicators that determine their service life and reliability. - ), acidic media (such as H2SO4, HCl) and high-temperature oxidation environments. For example, it needs to withstand sliding friction (such as gears, bearings), abrasive wear (such as mining machinery) or impact wear (such as molds) and other working conditions. Based on this, the current nitriding treatment is mostly used to form a high-hardness nitride layer on the surface of the steel component to achieve the performance requirements of improving wear resistance and corrosion resistance. However, the specific corrosion resistance and wear resistance of existing steel components have certain limitations. Summary of the invention

[0003] Technical problems solved by the present invention:

[0004] It is used to solve the current problem of poor corrosion resistance and wear resistance of steel components.

[0005] The technical solution adopted by the present invention is:

[0006] In view of the above technical problems, the purpose of the present invention is to provide a surface treatment method for improving the wear resistance and corrosion resistance of steel components. The specific contents are as follows:

[0007] A surface treatment method for improving the wear resistance and corrosion resistance of a steel component comprises the following steps:

[0008] (1) Pretreatment of the components, including alkali washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating;

[0009] (2) infiltrating the component treated in step (1) with a carbonitride lanthanum yttrium ion infiltrator;

[0010] (3) activating the component treated in step (2) with a lanthanum-yttrium activating infiltration agent;

[0011] (4) treating the component treated in step (3) with an oxygen ion infiltrator;

[0012] (5) After cooling and cleaning the components treated in step (4), they are sealed with a sealing agent and immersed in oil.

[0013] According to some preferred embodiments, in step (1), the alkaline cleaning is ultrasonic cleaning with an alkaline cleaning solution. Specifically, the alkaline cleaning solution includes 5-15 parts of sodium carbonate, 1-5 parts of sodium lignin sulfonate, 1-5 parts of polyepoxysuccinic acid, 1-5 parts of polyaspartic acid, 1-3 parts of sodium tripolyphosphate, 1-5 parts of sodium hydroxide, and 15-35 parts of deionized water. Ultrasonic cleaning: 45-65°C, 5-15 minutes.

[0014] According to some preferred embodiments, in step (1), a single rinse may be performed using countercurrent deionized water, using water at a temperature not lower than 50° C., for 1 to 3 minutes.

[0015] According to some preferred embodiments, in step (1), the pickling is carried out by using an acidic cleaning solution, the acidic cleaning solution comprises 1-5 parts of citric acid, 1-5 parts of phosphoric acid, 0.5-2 parts of hexamethylenetetramine, and 0.5-1 parts of fatty alcohol polyoxyethylene ether; the concentration of citric acid is 5%, and the concentration of phosphoric acid is 3%. Ultrasonic cleaning: 45-65°C, 5-10 min.

[0016] According to some preferred embodiments, in step (1), the pickled component is rinsed twice, and after the deionized water rinse, it is rinsed with water not less than 50° C. for 1 to 3 minutes. It is then dried with hot air and then subjected to subsequent nitriding treatment.

[0017] According to some preferred embodiments, in step (1), after hot air drying, preheating treatment is performed, and the preheating treatment is performed by heating the temperature to 380-400° C. at a rate of 5° C. / min for 40-50 min.

[0018] According to some preferred embodiments, in step (2), the components of the carbonitride lanthanum yttrium ion infiltration agent include 25-30 parts of KOCN, 30-35 parts of NaHCO3, 5-10 parts of Sr(OH)2, 5-15 parts of KCl, 5-10 parts of NaCl, 3-5 parts of K2SO4, 1-3 parts of ErCl3·6H2O, 5-10 parts of Li2B4O7, 1-3 parts of Ce(NO3)3·6H2O, 0.01-0.02 parts of YbCl3, 0.05-0.1 parts of YCl3, and 0.5-1.0 parts of La2(CO3)3.

[0019] According to some preferred embodiments, in step (2), the infiltration treatment adopts a gradient infiltration treatment, that is to say:

[0020] The first stage: 390-480℃, 30-60min;

[0021] The second stage: 450-550℃, treatment for 15-45min;

[0022] The third stage: 390-480℃, treatment for 30-60min.

[0023] According to some preferred embodiments, in step (3), the components of the lanthanum-yttrium activated infiltration agent include 30-40 parts of KOCN, 10-15 parts of NaHCO3, 5-15 parts of K2S, 14-25 parts of NaCl, 5-8 parts of Na2SiO3·9H2O, 1-3 parts of K2SO3, 1-3 parts of Ce(NO3)3·6H2O, 0.01-0.02 parts of YbCl3, 5-10 parts of Li2B4O7, 3-5 parts of KCl, 0.3-1 parts of YCl3, and 1-1.5 parts of La2(CO3)3.

[0024] According to some preferred embodiments, in step (3), the activation temperature is 390-500° C. and the activation time is 50-70 min.

[0025] According to some preferred embodiments, in step (4), the components of the oxygen ion permeating agent include 25-35 parts of NaOH, 15-25 parts of NaNO2, 30-40 parts of KCl, 10-20 parts of NH4Cl, and 30.5-1.0 parts of La2(CO3).

[0026] According to some preferred embodiments, in step (4), the infiltration temperature is 380-430° C., and the infiltration time is 30-40 min.

[0027] According to some preferred embodiments, in step (5), the components of the sealant include 35 to 40 parts of petroleum solvent (CAS.NO64742-57-0), 40 to 50 parts of hydrogenated heavy base oil (CAS.NO: 64742-52-5), and 14 to 20 parts of calcium sulfonate (CAS.NO68603-42-9).

[0028] Second, the present invention provides a steel component obtained by the above-mentioned surface treatment method.

[0029] The steel component comprises a component matrix and a composite infiltration layer covering the surface and the interior of the component matrix.

[0030] The material of the component matrix is ​​carbon steel or alloy steel, including 45# steel, 25Cr2Ni4WA and 30CrMnTiA.

[0031] The composite infiltration layer includes a first soft nitriding layer, a second soft nitriding layer, and a third soft nitriding layer that penetrate into the component matrix from the outside to the inside. Specifically, the first soft nitriding layer is formed by the oxygen ion infiltration agent penetrating into the surface of the component matrix. The second soft nitriding layer is formed by the carbon nitrogen lanthanum yttrium ion infiltration agent penetrating into the surface of the component matrix, and the third soft nitriding layer is formed by the lanthanum yttrium ion infiltration agent penetrating into the surface of the component matrix.

[0032] The technical mechanism and beneficial effects adopted by the present invention are as follows:

[0033] (1) The surface treatment method provided by the present invention sequentially adopts carbon-nitrogen lanthanum-yttrium ion infiltrant for infiltration treatment, lanthanum-yttrium activation infiltrant for activation treatment, and oxygen ion infiltrant for infiltration treatment. First, it can make the effective ions in the infiltrant diffuse into the interior of the component matrix, thereby forming a compound layer and diffusion layer with a certain thickness, which is composed of carbon-nitrogen compounds of metal elements and a solid solution of nitrogen in iron, and has high hardness, corrosion resistance and anti-sticking properties. In the present invention, KCl and K2SO4 are added to the carbon-nitrogen lanthanum-yttrium ion infiltrant, which can improve the reaction efficiency and make the infiltration layer more uniform. Second, it can promote the metal ions and non-metallic ions lanthanum-yttrium to diffuse deeper into the component matrix to increase the thickness of the composite infiltration layer, thereby improving the fatigue resistance of the component. In the present invention, K2S and K2SO4 are added to the lanthanum-yttrium activation infiltrant, which can improve the activity of the infiltrant and shorten the production cycle. Third, the carbon-nitrogen-lanthanum-yttrium ion infiltrant remaining on the surface of the component matrix reacts with the lanthanum-yttrium activated infiltrant to form a diffusion layer in which oxygen dissolves into the compound lattice in the form of gaps, and another part of the oxygen forms a metal oxide layer on the surface, thereby further improving the hardness and corrosion resistance of the component. The formation of a compound layer and a metal oxide layer on the surface of the component not only greatly improves the corrosion resistance of the component matrix, but also the treated components have good mechanical properties, high cost performance, and no pollution to the environment. Compared with the prior art, the addition of KCl to the oxygen ion infiltrant in the present invention has almost zero emissions after the reaction, which is more environmentally friendly.

[0034] (2) The surface treatment method provided by the present invention uses a gradient nitriding treatment method while the carbon-nitrogen-lanthanum-yttrium ion infiltrant is infiltrated, and utilizes the formed gradient infiltration layer structure to improve the corrosion resistance and wear resistance of the infiltration layer, thereby making the bonding strength between the infiltration layer and the component matrix high. By adopting gradient treatment at different temperatures and utilizing the formation of temperature difference, a nitrogen layer and a composite nitriding layer that is tightly bonded to the nitriding layer can be obtained, which is convenient for the subsequent introduction of other infiltration layers.

[0035] (3) The surface treatment method provided by the present invention performs a pretreatment process before the infiltration treatment to remove oil and clean the surface of the component substrate. Through the alkaline washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating treatment provided by the present invention, oil stains, passivation layers, and impurities on the surface of the component can be removed, thereby improving the structural strength of the nitriding layer and the component substrate, increasing the thickness of the nitriding layer, and thus facilitating further improvement of wear resistance and corrosion resistance.

[0036] (4) The surface treatment method provided by the present invention, the alkaline washing liquid and the pickling liquid provided, utilize the synergistic effect between the components, that is, through the combination of polyepoxysuccinic acid, polyaspartic acid, sodium lignin sulfonate, sodium carbonate, sodium tripolyphosphate, and sodium hydroxide, the surface of the component is strongly decontaminated, and then the sodium lignin sulfonate is used to help suspend the pollutants after cleaning, so as to facilitate the high cleanliness of the subsequent rinsing process, thereby avoiding the pollutants from remaining on the surface of the component matrix, thereby avoiding blocking the penetration of nitrogen atoms. The combination of components of the pickling liquid facilitates the removal of the oxide layer on the surface of the component matrix, thereby also facilitating the provision of more surface active sites, promoting the adsorption and diffusion of nitrogen, and also avoiding the defects of peeling of the nitrided layer and increased brittleness caused by the residue of the oxide layer. Then, by preheating the base component, oxides are generated on the surface of the component matrix, releasing hydrogen, thereby promoting the penetration of the nitriding agent, increasing the nitride content and distribution uniformity on the surface of the matrix, thereby improving the corrosion resistance and wear resistance. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0038] Example 1

[0039] This embodiment provides a surface treatment method for improving the wear resistance and corrosion resistance of steel components, comprising the following steps:

[0040] The material of the component base is 45# steel.

[0041] (1) Pretreatment of the components, including alkali washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating;

[0042] The alkaline cleaning solution includes 10 parts of sodium carbonate, 3 parts of sodium lignin sulfonate, 3 parts of polyepoxysuccinic acid, 3 parts of polyaspartic acid, 2 parts of sodium tripolyphosphate, 2 parts of sodium hydroxide, and 30 parts of deionized water. Ultrasonic cleaning: 60°C, 10 minutes.

[0043] For one rinse, use countercurrent deionized water for rinsing, use water not lower than 50℃ for rinsing for 2 minutes.

[0044] Pickling is a cleaning process using an acidic cleaning solution, which includes 3 parts of citric acid, 2 parts of phosphoric acid, 1 part of hexamethylenetetramine, and 1 part of fatty alcohol polyoxyethylene ether. The concentration of citric acid is 5%, and the concentration of phosphoric acid is 3%. Ultrasonic cleaning: 60°C, 8 minutes.

[0045] The pickled components are rinsed twice. After rinsing with deionized water, they are rinsed with water not lower than 50°C for 2 minutes and then dried with hot air.

[0046] Preheating: heating to 400°C at a rate of 5°C / min for 40 min.

[0047] (2) infiltrating the component treated in step (1) with a carbonitride lanthanum yttrium ion infiltrator;

[0048] The carbonitride lanthanum yttrium ion infiltration agent includes the following components in parts by weight: 27 parts of KOCN, 32 parts of NaHCO3, 7 parts of Sr(OH)2, 10 parts of KCl, 5%-10 parts of NaCl, 4 parts of K2SO4, 2 parts of ErCl3·6H2O, 7 parts of Li2B4O7, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 0.075 parts of YCl3, and 0.75 parts of La2(CO3)3.

[0049] The infiltration treatment adopts gradient infiltration treatment, that is to say:

[0050] The first stage: 390℃, 60min;

[0051] The second stage: 450℃, 30min;

[0052] The third stage: 390℃, treatment for 60min.

[0053] (3) activating the component treated in step (2) with a lanthanum-yttrium activating infiltration agent;

[0054] The lanthanum-yttrium activated infiltrant includes the following components in percentage by mass: 35 parts of KCNO, 12 parts of NaHCO3, 10 parts of K2S, 20 parts of NaCl, 6 parts of Na2SiO3·9H2O, 2 parts of K2SO3, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 8 parts of Li2B4O7, 4 parts of KCl, 0.6 parts of YCl3, and 1.2 parts of La2(CO3)3.

[0055] The activation temperature was 410°C and the activation time was 50 min.

[0056] (4) treating the component treated in step (3) with an oxygen ion infiltrator;

[0057] The oxygen ion permeating agent includes the following components in parts by weight: 30 parts of NaOH, 20 parts of NaNO2, 35 parts of KCl, 15 parts of NH4Cl, and 30.75 parts of La2(CO3).

[0058] The temperature of oxygen ion infiltration treatment is 380°C and the time is 30 minutes.

[0059] (5) After cooling and cleaning the components treated in step (4), they are sealed with a sealing agent and immersed in oil.

[0060] The sealing agent comprises the following components in percentage by weight: 37 parts of petroleum solvent, 45 parts of hydrogenated heavy base oil, and 17 parts of calcium sulfonate.

[0061] The sealing temperature was 160°C and the sealing time was 30 min.

[0062] The solvent for oil immersion is 10# engine oil, and the oil immersion time is 30 minutes.

[0063] Example 2

[0064] This embodiment provides a surface treatment method for improving the wear resistance and corrosion resistance of steel components, comprising the following steps:

[0065] The material of the component matrix is ​​25Cr2Ni4WA.

[0066] (1) Pretreatment of the components, including alkali washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating;

[0067] The alkaline cleaning solution includes 10 parts of sodium carbonate, 3 parts of sodium lignin sulfonate, 3 parts of polyepoxysuccinic acid, 3 parts of polyaspartic acid, 2 parts of sodium tripolyphosphate, 2 parts of sodium hydroxide, and 30 parts of deionized water. Ultrasonic cleaning: 60°C, 10 minutes.

[0068] For one rinse, use countercurrent deionized water for rinsing, use water not lower than 50℃ for rinsing for 2 minutes.

[0069] Pickling is a cleaning process using an acidic cleaning solution, which includes 3 parts of citric acid, 2 parts of phosphoric acid, 1 part of hexamethylenetetramine, and 1 part of fatty alcohol polyoxyethylene ether. The concentration of citric acid is 5%, and the concentration of phosphoric acid is 3%. Ultrasonic cleaning: 60°C, 8 minutes.

[0070] The pickled components are rinsed twice. After rinsing with deionized water, they are rinsed with water not lower than 50°C for 2 minutes and then dried with hot air.

[0071] Preheating: heating to 400°C at a rate of 5°C / min for 40 min.

[0072] (2) infiltrating the component treated in step (1) with a carbonitride lanthanum yttrium ion infiltrator;

[0073] The carbonitride lanthanum yttrium ion infiltration agent includes the following components in parts by weight: 27 parts of KOCN, 32 parts of NaHCO3, 7 parts of Sr(OH)2, 10 parts of KCl, 5%-10 parts of NaCl, 4 parts of K2SO4, 2 parts of ErCl3·6H2O, 7 parts of Li2B4O7, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 0.075 parts of YCl3, and 0.75 parts of La2(CO3)3.

[0074] The infiltration treatment adopts gradient infiltration treatment, that is to say:

[0075] The first stage: 480℃, 40min;

[0076] The second stage: 550℃, 20min;

[0077] The third stage: 480℃, 40min treatment.

[0078] (3) activating the component treated in step (2) with a lanthanum-yttrium activating infiltration agent;

[0079] The lanthanum-yttrium activated infiltrant includes the following components in percentage by mass: 35 parts of KCNO, 12 parts of NaHCO3, 10 parts of K2S, 20 parts of NaCl, 6 parts of Na2SiO3·9H2O, 2 parts of K2SO3, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 8 parts of Li2B4O7, 4 parts of KCl, 0.6 parts of YCl3, and 1.2 parts of La2(CO3)3.

[0080] The activation temperature is 500°C and the activation time is 50 min.

[0081] (4) treating the component treated in step (3) with an oxygen ion infiltrator;

[0082] The oxygen ion permeating agent includes the following components in parts by weight: 30 parts of NaOH, 20 parts of NaNO2, 35 parts of KCl, 15 parts of NH4Cl, and 30.75 parts of La2(CO3).

[0083] The temperature of oxygen ion infiltration treatment is 400°C and the time is 30 minutes.

[0084] (5) After cooling and cleaning the components treated in step (4), they are sealed with a sealing agent and immersed in oil.

[0085] The sealing agent comprises the following components in percentage by weight: 37 parts of petroleum solvent, 45 parts of hydrogenated heavy base oil, and 17 parts of calcium sulfonate.

[0086] The sealing temperature was 200°C and the sealing time was 40 min.

[0087] The solvent for oil immersion is 10# engine oil, and the oil immersion time is 40 minutes.

[0088] Example 3

[0089] This embodiment provides a surface treatment method for improving the wear resistance and corrosion resistance of steel components, comprising the following steps:

[0090] The material of the component matrix is ​​30CrMnMoTiA.

[0091] (1) Pretreatment of the components, including alkali washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating;

[0092] The alkaline cleaning solution includes 10 parts of sodium carbonate, 3 parts of sodium lignin sulfonate, 3 parts of polyepoxysuccinic acid, 3 parts of polyaspartic acid, 2 parts of sodium tripolyphosphate, 2 parts of sodium hydroxide, and 30 parts of deionized water. Ultrasonic cleaning: 60°C, 10 minutes.

[0093] For one rinse, use countercurrent deionized water for rinsing, use water not lower than 50℃ for rinsing for 2 minutes.

[0094] Pickling is a cleaning process using an acidic cleaning solution, which includes 3 parts of citric acid, 2 parts of phosphoric acid, 1 part of hexamethylenetetramine, and 1 part of fatty alcohol polyoxyethylene ether. The concentration of citric acid is 5%, and the concentration of phosphoric acid is 3%. Ultrasonic cleaning: 60°C, 8 minutes.

[0095] The pickled components are rinsed twice. After rinsing with deionized water, they are rinsed with water not lower than 50°C for 2 minutes and then dried with hot air.

[0096] Preheating: heating to 400°C at a rate of 5°C / min for 40 min.

[0097] (2) infiltrating the component treated in step (1) with a carbonitride lanthanum yttrium ion infiltrator;

[0098] The carbonitride lanthanum yttrium ion infiltration agent includes the following components in parts by weight: 27 parts of KOCN, 32 parts of NaHCO3, 7 parts of Sr(OH)2, 10 parts of KCl, 5%-10 parts of NaCl, 4 parts of K2SO4, 2 parts of ErCl3·6H2O, 7 parts of Li2B4O7, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 0.075 parts of YCl3, and 0.75 parts of La2(CO3)3.

[0099] The infiltration treatment adopts gradient infiltration treatment, that is to say:

[0100] The first stage: 420℃, 50min;

[0101] The second stage: 470℃, 30min;

[0102] The third stage: 420℃, treatment for 50min.

[0103] (3) activating the component treated in step (2) with a lanthanum-yttrium activating infiltration agent;

[0104] The lanthanum-yttrium activated infiltrant includes the following components in percentage by mass: 35 parts of KCNO, 12 parts of NaHCO3, 10 parts of K2S, 20 parts of NaCl, 6 parts of Na2SiO3·9H2O, 2 parts of K2SO3, 2 parts of Ce(NO3)3·6H2O, 0.015 parts of YbCl3, 8 parts of Li2B4O7, 4 parts of KCl, 0.6 parts of YCl3, and 1.2 parts of La2(CO3)3.

[0105] The activation temperature is 440°C and the activation time is 50 min.

[0106] (4) treating the component treated in step (3) with an oxygen ion infiltrator;

[0107] The oxygen ion permeating agent includes the following components in parts by weight: 30 parts of NaOH, 20 parts of NaNO2, 35 parts of KCl, 15 parts of NH4Cl, and 30.75 parts of La2(CO3).

[0108] The temperature of oxygen ion infiltration treatment is 380°C and the time is 35 minutes.

[0109] (5) After cooling and cleaning the components treated in step (4), they are sealed with a sealing agent and immersed in oil.

[0110] The sealing agent comprises the following components in percentage by weight: 37 parts of petroleum solvent, 45 parts of hydrogenated heavy base oil, and 17 parts of calcium sulfonate.

[0111] The sealing temperature was 180°C and the sealing time was 35 min.

[0112] The solvent for oil immersion is 10# engine oil, and the oil immersion time is 30 minutes.

[0113] Comparative Example 1

[0114] The difference between this comparative example and Example 3 is that no oxygen ion permeating agent is used for treatment.

[0115] Comparative Example 2

[0116] The difference between this comparative example and Example 3 is that no sealing agent is used for sealing treatment, and oil immersion is performed directly.

[0117] Comparative Example 3

[0118] The difference between this comparative example and Example 3 is that the carbon-nitrogen-lanthanum-yttrium ion infiltration agent does not contain KCl and K2SO4.

[0119] Comparative Example 4

[0120] The difference between this comparative example and Example 3 is that the pretreatment process includes alkaline washing, one rinsing, drying and preheating.

[0121] Comparative Example 5

[0122] The difference between this comparative example and Example 3 is that the pretreatment process includes pickling, secondary rinsing, drying and preheating.

[0123] Comparative Example 6

[0124] The difference between this comparative example and Example 3 is that the pretreatment process includes alkaline washing, primary rinsing, acid washing, secondary rinsing and drying.

[0125] Comparative Example 7

[0126] The difference between this comparative example and Example 3 is that in step (2), the infiltration treatment is: 420° C., 130 min.

[0127] Test example

[0128] The components obtained by processing in Examples 1-3 and Comparative Examples 1-7 were used as samples to carry out performance measurement. The results are shown in Table 1.

[0129] Table 1 Test results

[0130]

[0131] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A surface treatment method for improving the wear resistance and corrosion resistance of steel components, characterized in that: The steps include: (1) Pretreatment of the components, including alkali washing, primary rinsing, acid washing, secondary rinsing, drying, and preheating; (2) treating the component treated in step (1) with a carbonitride lanthanum yttrium ion infiltration agent; (3) activating the component treated in step (2) with a lanthanum-yttrium activating infiltration agent; (4) treating the component treated in step (3) with an oxygen ion infiltrator; (5) After cooling and cleaning the components treated in step (4), they are sealed with a sealing agent and immersed in oil.

2. The surface treatment method for improving the wear resistance and corrosion resistance of steel components according to claim 1, characterized in that: The components of carbonitride lanthanum yttrium ion infiltration agent include 25-30 parts of KOCN, 30-35 parts of NaHCO3, 5-10 parts of Sr(OH)2, 5-15 parts of KCl, 5-10 parts of NaCl, 3-5 parts of K2SO4, 1-3 parts of ErCl3·6H2O, 5-10 parts of Li2B4O7, 1-3 parts of Ce(NO3)3·6H2O, 0.01-0.02 parts of YbCl3, 0.05-0.1 parts of YCl3, and 0.5-1.0 parts of La2(CO3)3.

3. The surface treatment method for improving the wear resistance and corrosion resistance of steel components according to claim 1, characterized in that: The components of the lanthanum-yttrium activated infiltration agent include 30-40 parts of KOCN, 10-15 parts of NaHCO3, 5-15 parts of K2S, 14-25 parts of NaCl, 5-8 parts of Na2SiO3·9H2O, 1-3 parts of K2SO3, 1-3 parts of Ce(NO3)3·6H2O, 0.01-0.02 parts of YbCl3, 5-10 parts of Li2B4O7, 3-5 parts of KCl, 0.3-1 parts of YCl3, and 1-1.5 parts of La2(CO3)3.

4. The surface treatment method for improving the wear resistance and corrosion resistance of a steel component according to claim 1, characterized in that: In step (3), the activation temperature is 390-500° C. and the activation time is 50-70 min.

5. The surface treatment method for improving the wear resistance and corrosion resistance of steel components according to claim 1, characterized in that: The components of the oxygen ion permeating agent include 25-35 parts of NaOH, 15-25 parts of NaNO2, 30-40 parts of KCl, 10-20 parts of NH4Cl, and 30.5-1.0 parts of La2(CO3).

6. The surface treatment method for improving the wear resistance and corrosion resistance of a steel component according to claim 1, characterized in that: In step (4), the infiltration temperature is 380-430° C., and the infiltration time is 30-40 min.

7. The surface treatment method for improving the wear resistance and corrosion resistance of a steel component according to any one of claims 1 to 6, characterized in that: The preprocessing in step (1) includes at least one of the features (1-1) to (1-5): (1-1) Alkaline cleaning is an ultrasonic cleaning treatment using an alkaline cleaning solution, wherein the alkaline cleaning solution includes 5 to 15 parts of sodium carbonate, 1 to 5 parts of sodium lignin sulfonate, 1 to 5 parts of polyepoxysuccinic acid, 1 to 5 parts of polyaspartic acid, 1 to 3 parts of sodium tripolyphosphate, 1 to 5 parts of sodium hydroxide, and 15 to 35 parts of deionized water; (1-2) One rinse is performed with countercurrent deionized water, using water not less than 50°C; (1-3) Pickling is a cleaning process using an acidic cleaning solution, wherein the acidic cleaning solution includes 1 to 5 parts of citric acid, 1 to 5 parts of phosphoric acid, 0.5 to 2 parts of hexamethylenetetramine, and 0.5 to 1 part of fatty alcohol polyoxyethylene ether; the concentration of citric acid is 5%, and the concentration of phosphoric acid is 3%; (1-4) The pickled component is rinsed with deionized water for a second time; (1-5) Preheating: heating to 380-400°C at a rate of 5°C / min for 40-50 min.

8. The surface treatment method for improving the wear resistance and corrosion resistance of a steel component according to any one of claims 1 to 6, characterized in that: In step (2), the infiltration treatment adopts gradient infiltration treatment.

9. The surface treatment method for improving the wear resistance and corrosion resistance of steel components according to claim 8, characterized in that: Infiltration treatment includes: The first stage: 390-480℃, 30-60min; The second stage: 450-550℃, treatment for 15-45min; The third stage: 390-480℃, treatment for 30-60min.

10. A steel component obtained by the surface treatment method according to any one of claims 1 to 9, the steel component comprising a component substrate and a composite nitriding layer covering the surface and the interior of the component substrate; the composite nitriding layer comprises a first soft nitriding layer, a second soft nitriding layer, and a third soft nitriding layer which penetrate into the component substrate from the outside to the inside.

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