Ash removal agent for steel products

Abstract

The invention relates to an ash removal agent for steel products. The ash removal agent comprises the following components in percentage by weight: 0.5-25% of a surfactant, 5-20% of an auxiliary agent, 0.5-10% of a corrosion inhibitor, 0.5-15% of an oxidizing agent, 1-25% of a dispersing agent and the balance of deionized water. The oil and dust removal device is convenient to use, the oil and dust removal functions are integrated, it is ensured that the oil and dust removal effect on workpieces is good, efficient and high-quality oil and dust removal can be conducted on the workpieces under the low-temperature or normal-temperature condition, the sizes of the workpieces cleaned through the oil and dust removal device do not deviate, re-rusting is avoided, and the oil and dust removal device is suitable for industrial production. The problem of great use limitation caused by the fact that an ash removing agent or a cleaning agent on the market cannot realize excellent oil ash removal on steel products under the condition of normal temperature or low temperature is effectively solved; and the problems that the due size of the workpiece is affected and the workpiece is re-rusted in a short time due to over-corrosion of the surface of the workpiece when the workpiece is subjected to dust removal by using strong acid or strong oxidation chemical agents in the market at present are solved.

Description

Technical Field

[0001] The invention relates to the field of precision cleaning, and in particular to a dust removing agent for steel products. Background Art

[0002] With the deepening of industrialization, various steel products and precision metal workpieces have put forward higher requirements for metal cleaning. At the same time, in order to achieve the goal of reducing costs and increasing efficiency, the cleaning agent is required to meet various mixed complex conditions and environments. In particular, the dust on the workpiece after processing is likely to affect the subsequent process and the final effect of the finished product. For example, the existence of dust on the workpiece makes the subsequent film adhesion poor, resulting in the film and paint falling off the workpiece, resulting in poor corrosion resistance of the finished workpiece.

[0003] The composition of the ash on different series of steel products is different: (1) trace metal components or impurities form oxides or scales, thus forming ash; (2) the workpiece material itself has a high carbon content. After acid etching, anodic electrolysis and other processes, part of the metal components are dissolved, and the remaining carbon components form ash; (3) the lubricating oil or rust-proof oil used in the processing of the workpiece contains carbon particles. When the oil adsorbed on the surface of the workpiece is removed, the carbon particles will be firmly adsorbed on the surface of the workpiece due to their large surface energy, forming ash; (4) after the workpiece is processed, due to the long storage time, the dust in the air is adsorbed on the oil film. When the oil film is removed, the dust is tightly adsorbed on the surface of the workpiece, forming ash.

[0004] Some of the common putty cleaning agents on the market are hydrocarbon cleaning agents or solvent-based cleaning agents with other organic solvents added. This type of cleaning agent can effectively remove putty to a certain extent, but the cleaning agent working fluid is easy to adhere to the surface of the workpiece, and the degree of removal by the organic matter itself in the short term is extremely limited, which makes the workpiece easy to be oiled again, affecting the progress and overall efficiency of the workpiece pretreatment. If other auxiliary processes for removing floating oil are added, the pretreatment cost will be increased. Another part of the cleaning agent removes ash through strong acid or strong oxidant, which has a good effect, but it is easy to over-corrode the surface of the workpiece, affect the size of the workpiece, and easily cause the workpiece to rust. And this type of cleaning agent will seriously corrode steel products due to its strong acidity, making it only suitable for removing putty from aluminum products, and it is not suitable for removing putty from steel products. In addition, other deashing agents on the market that are mainly based on surfactants have poor actual effects. They either focus on degreasing with a weak deashing effect, or focus on deashing with a weak degreasing effect. When degreasing and deashing are required, it is difficult to meet the requirements. It can often remove oil but leave a thin layer of ash. In addition, in order to achieve a good deashing effect, this type of deashing agent needs to be heated to enhance the activation performance of the deashing agent cleaning, resulting in the treatment temperature of the workpiece for degreasing and deashing to be maintained above 40°C, such as 45°C or 50°C... It is impossible to achieve excellent and efficient degreasing and deashing of steel products at room temperature or low temperature (such as 15°C), resulting in its limitation of use. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a steel product deashing agent which is efficient, environmentally friendly, compatible, and effective in both oil and dust removal.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: the steel product deashing agent is composed of the following components in weight ratio: Surfactant: 0.5-25%; Additives: 5-20%; Corrosion inhibitor: 0.5-10%; Oxidant: 0.5-15%; Diffuser: 1-25%; The balance was deionized water.

[0007] Preferably, the surfactant includes one or a mixture of two or more of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride.

[0008] By adopting the above technical solution, a surfactant composed of the above materials is added to the components so that the surfactant can directly penetrate and emulsify the putty and dirt on the metal workpiece or product (i.e., steel product) to change the interface energy between the oil particles, the oil film and the surface of the metal workpiece or product, thereby reducing the mutual attraction between the two, making them easy to separate, accompanied by multiple action processes such as saponification, emulsification, penetration, dispersion and dissolution.

[0009] Preferably, the isomeric alkyl chain R of the isomeric polyoxyethylene alcohol ester (ether) contains 6-12 carbon atoms, and the alkyl group of the polyoxyethylene sorbitan monocarboxylate contains 8-18 carbon atoms. The spatial isomerization of the surfactant with the carbon atom number in this range is liquid at both low and high temperatures, and its solubility and fluidity are relatively good, and it is non-volatile. The surfactant composed of the above materials has a different balance of emulsification, permeability, wettability and dispersibility from conventional surfactants, so that it can achieve compatibility and satisfaction for degreasing and deashing of steel products, and the effects of degreasing and deashing are both optimal. It not only solves the problem that the deashing agent with surfactant as the main body on the market is difficult to be compatible when degreasing and deashing are combined, which often leads to the problem that it can degreasing but leaving thin ash, but also solves the problem that the deashing agent or degreasing and deashing cleaning agent on the market cannot achieve excellent degreasing and deashing of steel products at room temperature or low temperature (such as 15°C), which leads to its large use limitations.

[0010] Preferably, the auxiliary agent includes one or a mixture of two or more of sodium metasilicate pentahydrate, sodium tripolyphosphate, sodium citrate, sodium gluconate, sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate.

[0011] By adopting the above-mentioned technical scheme, an alkaline auxiliary agent is added into the ingredients. The addition of the auxiliary agent mainly plays the role of complexation, alkaline buffering, wetting and saponification. Its addition can significantly change the detergency of the system, enhance the performance of the surfactant, and reduce the amount of surfactant used, thereby achieving energy efficiency improvement and cost reduction.

[0012] Preferably, the corrosion inhibitor includes one or a mixture of two or more of triethanolamine, thiourea, strontium nitrate and ethylene thiourea.

[0013] By adopting the above technical solution, a corrosion inhibitor is added into the composition. When the putty is separated from the metal workpiece or product, the surface of the metal workpiece or product will be directly in contact with the external environment and easily oxidized or corroded. The addition of the corrosion inhibitor will form a passivation protective film on the surface of the metal workpiece or product to avoid erosion by air and electrolyte, thereby achieving long-term cleaning and anti-oxidation and anti-rust effects on the surface of the metal workpiece or product, ensuring that the metal workpiece or product will not rust in a short period of time, thereby solving the problem that the working fluid of the hydrocarbon cleaning agent or the working fluid of the solvent-based cleaning agent on the market is easy to adhere to the surface of the workpiece, and the degree of removal by the volatilization of organic matter itself in a short period of time is extremely limited, causing the workpiece to rust in a short period of time.

[0014] Preferably, the oxidant comprises one or a mixture of two or more of sodium nitrate, sodium nitrite, hydrogen peroxide and iodine solution.

[0015] By adopting the above technical solution, an oxidant is added to the components, and the addition of the oxidant can accelerate the chemical reaction, thereby improving the efficiency of dust removal. At the same time, the oxidant can decompose and remove some active impurities and dust on the surface of the metal workpiece or product through oxidation, that is, the oxidant can react with the impurities and dust on the surface of the metal workpiece or product to generate products that are easy to remove, thereby promoting the dust removal process to improve the dust removal efficiency.

[0016] Preferably, the diffusant includes one or a mixture of two of sodium methylene bisnaphthalene sulfonate (NNO) and diffusant NNF.

[0017] By adopting the above technical scheme, a diffusant is added into the composition, and the diffusant can be adsorbed on the surface of various solid particles to carry out metal ion complex exchange. At the same time, because the active groups on it can produce condensation or hydrogen bond with other compounds, and because of the difference in molecular weight and functional groups, its dispersing and emulsifying properties can well disperse the putty on the surface of the metal workpiece or product into the working fluid, and can effectively prevent it from aggregating and precipitating on the workpiece surface again, so as to facilitate the subsequent cleaning of the metal workpiece.

[0018] Preferably, the working principle of the steel product deashing agent is as follows: it adopts a low-carbon chain surfactant compounded with other components in the composition, so that it has extremely strong penetration, stripping and emulsification effects. The low-carbon chain surfactant is liquid at both low and high temperatures, so that the solubility and fluidity of the product are relatively good and non-volatile. Its combination with alkaline additives is conducive to the removal of saponifiable grease. It has extremely strong wetting, adsorption, emulsification and dispersion effects on mineral oil, floating ash or hanging ash. At the same time, it is added with additives to play the role of complexation, alkaline buffering, wetting and saponification, thereby achieving energy The decontamination ability of the whole system is changed, and the performance of the surfactant is greatly enhanced, so that it can realize the degreasing and deashing functions in one at room temperature or low temperature (such as 15°C), and the degreasing and deashing effects are both optimal. It not only solves the problem that the degreasing agent based on surfactants on the market often has the problem of degreasing but leaving thin ash when it needs to be degreasing and deashing in one, but also solves the problem that the degreasing agent or degreasing and deashing cleaning agent on the market cannot achieve excellent degreasing and deashing of steel products at room temperature or low temperature, resulting in large limitations in its use. It also adds a corrosion inhibitor to the component. When the putty is separated from the workpiece, the corrosion inhibitor can form a passivation protective film on the surface of the workpiece to avoid erosion by air and electrolyte, thereby enhancing the anti-rust effect of the workpiece and preventing the workpiece from rusting in a short period of time. It effectively solves the problem that the degreasing agent or chemical cleaning agent using strong acid or strong oxidant on the market is easy to cause excessive corrosion on the surface of the workpiece, resulting in rusting of the workpiece in a short period of time. It also adds oxidants to the components to decompose and remove some active impurities and ash on the surface of metal workpieces or products, so as to greatly improve the dust removal efficiency of metal workpieces or products. The steel product dust remover made of low-carbon chain surfactants, additives, corrosion inhibitors, oxidants, diffusants and deionized water is mild overall and does not corrode the workpiece strongly to avoid affecting the proper size of the workpiece. It is particularly suitable for precision cleaning of metal workpieces or products, and solves the problem that strong acid and strong oxygen chemicals (or strong acid and strong oxygen dust removers) used in the market to clean metal workpieces are prone to corrode the workpiece and affect the size of the workpiece.

[0019] Preferably, the present invention also provides a method for preparing a dust removing agent for steel products: Step (1): first pour 2 / 3 of deionized water into a stirrer, then add the above-mentioned weight proportion of auxiliary agent, corrosion inhibitor, oxidant and diffusant into the stirrer, set the stirring speed to 50 rpm, and stir until the auxiliary agent, corrosion inhibitor, oxidant and diffusant are completely dissolved.

[0020] Step (2): Add the surfactant in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0021] Step (3): Pour the remaining 1 / 3 of the deionized water into the stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare the steel product deashing agent.

[0022] Compared with the existing deashing agents, the beneficial effects of the present invention are as follows: 1. The present invention adopts a low-carbon chain surfactant to be compounded with other auxiliary agents in the formula, so that it has extremely strong penetration, stripping and emulsification effects. At the same time, it adds an alkaline auxiliary agent to the components to facilitate the removal of saponifiable oils and fats. The combination of the surfactant and the auxiliary agent has extremely strong wetting, adsorption, emulsification and dispersion effects on mineral oils and floating ash or hanging ash, so as to achieve the two-in-one function of degreasing and deashing, and ensure that the effects of degreasing and deashing are good. The low-carbon chain surfactant also enables the present invention to achieve efficient and high-quality degreasing and deashing of metal workpieces or products at low temperature (15°C) or room temperature. It not only effectively solves the problem that the deashing agents or degreasing and deashing cleaning agents on the market cannot achieve excellent degreasing and deashing of steel products under room temperature or low temperature conditions, resulting in large limitations on their use, but also solves the problem that the deashing agents on the market with surfactants as the main body are difficult to be compatible when degreasing and deashing are required to be two-in-one, resulting in the problem that they can often remove oil but leave a thin layer of ash.

[0023] 2. The steel product deashing agent working fluid produced by the present invention does not contain separate organic hydrocarbon components, and is a water-based metal pretreatment agent that is simple and convenient to use. After degreasing and deashing treatment, there is no organic matter remaining on the surface of the workpiece, so that the degreasing and deashing effect is optimal.

[0024] 3. By adding corrosion inhibitors into the components, the addition of corrosion inhibitors will form a passivation protective film on the surface of metal workpieces or products to avoid erosion by air and electrolytes, thereby achieving long-term cleaning, anti-oxidation and anti-rust effects on the surface of metal workpieces or products, ensuring that the metal workpieces or products will not rust in a short period of time, thereby solving the problem that the working fluid of hydrocarbon cleaning agents or solvent-based cleaning agents on the market is easily attached to the surface of the workpiece, and the degree of removal by organic matter volatilization itself in a short period of time is extremely limited, which makes the workpiece easily rust.

[0025] 4. By adding a diffusant into the components, the addition of the diffusant can disperse the putty on the surface of the metal workpiece into the working fluid well, and effectively prevent it from aggregating and settling on the surface of the workpiece again, so as to facilitate the subsequent cleaning of the metal workpiece.

[0026] 5. The steel product deashing agent made of a compound of low-carbon chain surfactants, additives, corrosion inhibitors, oxidants, diffusants and deionized water is mild overall, has no strong corrosion to the workpiece, and has no effect on the required size of the workpiece, thereby solving the problem that the strong acid and strong oxygen deashing agents or cleaning agents on the market are easy to corrode the workpiece and affect the size of the workpiece when cleaning metal workpieces. DETAILED DESCRIPTION

[0027] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention. Example 1

[0028] This embodiment discloses a steel product deashing agent, which is composed of the following components in weight ratio: Surfactant: 3%; Additives: 5%; Corrosion inhibitor: 2%; Oxidant: 3%; Diffuser: 8.5%; The balance is deionized water (i.e., deionized water: 78.5%).

[0029] Specifically, the surfactant is a mixture of isomeric polyoxyethylene alcohol ester (ether) and fatty alcohol polyoxyethylene ether sodium sulfate, and the weight ratio of isomeric polyoxyethylene alcohol ester (ether) to fatty alcohol polyoxyethylene ether sodium sulfate is 1:1, wherein the isomeric alkyl chain R of the isomeric polyoxyethylene alcohol ester (ether) contains 6-12 carbon atoms.

[0030] Specifically, the auxiliary agent is sodium tripolyphosphate.

[0031] Specifically, the corrosion inhibitor is strontium nitrate.

[0032] Specifically, the oxidant is sodium nitrate.

[0033] Wherein, the diffusing agent is sodium methylene bisnaphthalene sulfonate (NNO).

[0034] The preparation method of the steel product deashing agent is as follows: step (1): firstly pour 2 / 3 of the above-mentioned deionized water into a stirrer, then add the above-mentioned auxiliary agent, corrosion inhibitor, oxidant and diffusant in the above-mentioned weight proportion into the stirrer, set the stirring speed to 50 rpm, and stir until the auxiliary agent, corrosion inhibitor, oxidant and diffusant are completely dissolved.

[0035] Step (2): Add the surfactant in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0036] Step (3): Pour the remaining 1 / 3 of the deionized water into a stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare a steel product deashing agent. Example 2

[0037] This embodiment discloses a steel product deashing agent, which is composed of the following components in weight ratio: Surfactant: 6%; Additives: 9%; Corrosion inhibitor: 4%; Oxidant: 6%; Diffuser: 10%; The balance is deionized water (i.e., deionized water: 65%).

[0038] Specifically, the surfactant is a mixture of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, alkyl alcohol amide and lauryl alcohol phosphate ester MAE, and the weight ratio of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, alkyl alcohol amide and lauryl alcohol phosphate ester MAE is 1:1:1:1, wherein the isomeric alkyl chain R of the isomeric polyoxyethylene alcohol esters (ethers) contains 6-12 carbon atoms.

[0039] Specifically, the auxiliary agent is a mixture of sodium gluconate, potassium hydroxide and sodium bicarbonate, and the weight ratio of sodium gluconate, potassium hydroxide and sodium bicarbonate is 1:1:1.

[0040] Specifically, the corrosion inhibitor is a mixture of strontium nitrate and ethylene thiourea, and the weight ratio of strontium nitrate to ethylene thiourea is 1:1.

[0041] Specifically, the oxidant is a mixture of sodium nitrate and iodine solution, and the weight ratio of sodium nitrate to iodine solution is 1:1.

[0042] Specifically, the diffusant is diffusant NNF.

[0043] The preparation method of the steel product dust removal agent is as follows: step (1): firstly, pour 2 / 3 of the above-mentioned weight proportion of deionized water into a stirrer, then add the above-mentioned weight proportion of auxiliary agent, corrosion inhibitor, oxidant and diffusant into the stirrer, set the stirring speed to 50 rpm, and stir until the auxiliary agent, corrosion inhibitor, oxidant and diffusant are completely dissolved.

[0044] Step (2): Add the surfactants in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0045] Step (3): Pour the remaining 1 / 3 of the above weight ratio of deionized water into a stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare a steel product deashing agent. Example 3

[0046] This embodiment discloses a steel product deashing agent, which is composed of the following components in weight ratio: Surfactant: 8%; Additives: 10%; Corrosion inhibitor: 5%; Oxidant: 7%; Diffuser: 12%; The balance is deionized water (ie, deionized water: 58%).

[0047] Specifically, the surfactant is a mixture of polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride, and the weight ratio of polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride is 1:1:1:1, wherein the alkyl group of polyoxyethylene sorbitan monocarboxylate contains 8-18 carbon atoms.

[0048] Specifically, the auxiliary agent is a mixture of sodium tripolyphosphate, sodium gluconate, potassium hydroxide and sodium bicarbonate, and the weight ratio of sodium tripolyphosphate, sodium gluconate, potassium hydroxide and sodium bicarbonate is 1:1:1:1.

[0049] Specifically, the corrosion inhibitor is a mixture of triethanolamine, strontium nitrate and ethylene thiourea, and the weight ratio of triethanolamine, strontium nitrate and ethylene thiourea is 1:1:1.

[0050] Specifically, the oxidant is a mixture of sodium nitrate, sodium nitrite and iodine solution, and the weight ratio of sodium nitrate, sodium nitrite and iodine solution is 1:1:1.

[0051] Specifically, the diffusing agent is sodium methylene bisnaphthalene sulfonate (NNO).

[0052] The preparation method of the steel product deashing agent is as follows: step (1): firstly pour 2 / 3 of the above-mentioned deionized water into a stirrer, then add the above-mentioned auxiliary agent, corrosion inhibitor, oxidant and diffusant in the above-mentioned weight proportion into the stirrer, set the stirring speed to 50 rpm, and stir until the auxiliary agent, corrosion inhibitor, oxidant and diffusant are completely dissolved.

[0053] Step (2): Add the surfactant in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0054] Step (3): Pour the remaining 1 / 3 of the deionized water into a stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare a steel product deashing agent. Example 4

[0055] This embodiment discloses a steel product deashing agent, which is composed of the following components in weight ratio: Surfactant: 10%; Additives: 12%; Corrosion inhibitor: 7%; Oxidant: 8%; Diffuser: 11%; The balance is deionized water (ie, deionized water: 52%).

[0056] Specifically, the surfactant is a mixture of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride, and the weight ratio of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride is 1:1:1:1:1:1:1, wherein the isomeric alkyl chain R of the isomeric polyoxyethylene alcohol esters (ethers) contains 6-12 carbon atoms, and the alkyl group of the polyoxyethylene sorbitan monocarboxylate contains 8-18 carbon atoms.

[0057] Specifically, the auxiliary agent is a mixture of sodium metasilicate pentahydrate, sodium tripolyphosphate, sodium citrate, sodium gluconate, sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate, and the weight ratio of sodium metasilicate pentahydrate, sodium tripolyphosphate, sodium citrate, sodium gluconate, sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate is 1:1:1:1:1:1:1:1:1.

[0058] Specifically, the corrosion inhibitor is a mixture of triethanolamine, strontium nitrate and ethylene thiourea, and the weight ratio of triethanolamine, strontium nitrate and ethylene thiourea is 1:1:1.

[0059] Specifically, the oxidant is a mixture of sodium nitrate, sodium nitrite, hydrogen peroxide and iodine solution, and the weight ratio of sodium nitrate, sodium nitrite, hydrogen peroxide and iodine solution is 1:1:1:1.

[0060] Specifically, the diffusing agent is a mixture of sodium methylene bisnaphthalene sulfonate (NNO) and diffusing agent NNF, and the weight ratio of sodium methylene bisnaphthalene sulfonate (NNO) to diffusing agent NNF is 1:1.

[0061] The preparation method of the steel product deashing agent is as follows: step (1): firstly pour 2 / 3 of the above-mentioned deionized water into a stirrer, then add the above-mentioned auxiliary agent, corrosion inhibitor, oxidant and diffusant in the above-mentioned weight proportion into the stirrer, set the stirring speed to 50 rpm, and stir until the auxiliary agent, corrosion inhibitor, oxidant and diffusant are completely dissolved.

[0062] Step (2): Add the surfactant in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0063] Step (3): Pour the remaining 1 / 3 of the deionized water into a stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare a steel product deashing agent. Example 5

[0064] This embodiment discloses a deashing agent, which is composed of the following components in weight ratio: Surfactant: 10%; Complexing agent: 12%; Corrosion inhibitor: 7%; Oxidant: 8%; The balance is deionized water (i.e., deionized water: 63%).

[0065] Specifically, the surfactant is a mixture of sodium dodecylbenzene sulfonate and sodium dodecyl sulfate, and the weight ratio of sodium dodecylbenzene sulfonate to sodium dodecyl sulfate is 1:1.

[0066] Specifically, the complexing agent is a mixture of sodium metasilicate pentahydrate and sodium citrate, and the weight ratio of sodium metasilicate pentahydrate to sodium citrate is 1:1.

[0067] Specifically, the corrosion inhibitor is urea.

[0068] Specifically, the oxidant is a mixture of sodium persulfate and ammonium persulfate, and the mass ratio of sodium persulfate to ammonium persulfate is 1:1.

[0069] The preparation method of the deashing agent is as follows: Step (1): firstly pour 2 / 3 of the above deionized water into a stirrer, then add the above weight proportion of complexing agent, corrosion inhibitor and oxidant into the stirrer, set the stirring speed to 50 rpm, and stir until the complexing agent, corrosion inhibitor and oxidant are completely dissolved.

[0070] Step (2): Add the surfactant in the above weight ratio into the stirrer, maintain the stirring speed at 50 rpm, and stir for 30 minutes.

[0071] Step (3): Pour the remaining 1 / 3 of the deionized water into a stirrer, maintain the stirring speed at 50 rpm, and stir for 8 minutes to prepare a deashing agent.

[0072] The method of making the steel product deashing agent produced in Examples 1-4 and the deashing agent produced in Example 5 into working fluids is as follows: first, add equal amounts of clean water to five containers respectively, then add equal amounts of the deashing agent (stock solution) produced in Examples 1-5 to each container respectively, and then add equal amounts of clean water to each container again, and stir evenly to make the deashing agent working fluid. Among them, the weight ratio of the equal amount of clean water added to each container for the first time to the equal amount of deashing agent (stock solution) added to each container is 19:1, and the weight ratio of the equal amount of clean water added to each container again to the equal amount of deashing agent (stock solution) added to each container is 1:1.

[0073] The deashing agent working fluid prepared by the above method using the weight ratio components of Examples 1-5 and conventional hydrocarbon cleaning agents and strong acid and strong oxygen chemical agents (or cleaning agents) on the market were used to remove oil and dust from the same seven iron parts (i.e. workpieces). The test results of various properties are shown in the following table:

[0074] It can be seen from the data in the above table that the weight proportion components of Examples 1-4 of the present invention are all within the required range of the steel product deashing agent disclosed in the present invention. The steel product deashing agent produced by Examples 1-4 of the present invention is a water-based treatment agent, which is easy to use. The working fluid produced by the proportion components of Examples 1-4 respectively has no organic residue and no rust on the surface of the iron parts (or workpieces) after cleaning, indicating that it is mild and does not corrode iron parts and does not affect the proper size of iron parts, and the two-in-one effects of degreasing and deashing are good; and its water solubility can maintain a uniform and transparent state under low temperature conditions of 15°C, among which Example 4 has the fastest degreasing and deashing time under low temperature conditions of 15°C. The ingredients of Example 5 use conventional surfactants, which do not contain diffusants. The water solubility of Example 5 and strong acid and strong oxygen chemicals must be above 40°C to maintain uniformity and transparency (that is, it is impossible to achieve efficient and high-quality oil and dust removal for iron parts under low or normal temperature conditions); the cleaning temperature of Example 5 and hydrocarbon cleaning agents for iron parts (or workpieces) must be established at above 40°C to prevent rust and not affect the size of the workpiece, but the surface of the iron parts (or workpieces) cleaned by them all showed water breaking (surface lipophilicity), indicating that their oil and dust removal effect is poor; and although the iron parts (or workpieces) cleaned by strong acid and strong oxygen chemicals have good oil and dust removal effects, they affect the size of the workpiece and rust will occur in a short period of time. Therefore, the steel product deashing agent made with the proportion of the components of the present invention not only has significantly improved performance in terms of oil removal, dust removal, easy rinsing and rust prevention, but also can achieve efficient and high-quality oil and dust removal of iron parts (or workpieces) under low or normal temperature conditions, so as to solve the problem that the existing deashing agents on the market can only remove dust from iron parts (or workpieces) under high temperature conditions above 40°C, and cannot achieve efficient oil and dust removal of iron parts (or workpieces) under low or normal temperature conditions.

[0075] The present invention is not limited to the above-mentioned optimal implementation mode. Any other products identical or similar to the present invention obtained by anyone under the inspiration of the present invention shall fall within the protection scope of the present invention.

Claims

1. A deashing agent for steel products, characterized in that: It is composed of the following ingredients in weight ratio: Surfactant: 0.5-25%; Additives: 5-20%; Corrosion inhibitor: 0.5-10%; Oxidant: 0.5-15%; Diffuser: 1-25%; The balance is deionized water; The surfactant includes one or a mixture of two or more of isomeric polyoxyethylene alcohol esters (ethers), sodium polyoxyethylene fatty alcohol ether sulfate, polyoxyethylene sorbitan monocarboxylate, alkyl alcohol amide, lauryl alcohol phosphate MAE and monoglyceride.

2. A steel product deashing agent according to claim 1, characterized in that: The isomeric alkyl chain R of the isomeric polyoxyethylene alcohol ester (ether) contains 6-12 carbon atoms; the alkyl chain of the polyoxyethylene sorbitan monocarboxylate contains 8-18 carbon atoms.

3. A steel product deashing agent according to claim 1, characterized in that: The auxiliary agent includes one or a mixture of two or more of sodium metasilicate pentahydrate, sodium tripolyphosphate, sodium citrate, sodium gluconate, sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate.

4. A steel product deashing agent according to claim 1, characterized in that: The corrosion inhibitor comprises one or a mixture of two or more of triethanolamine, thiourea, strontium nitrate and ethylene thiourea.

5. The deashing agent for steel products according to claim 1, characterized in that: The oxidant includes one or a mixture of two or more of sodium nitrate, sodium nitrite, hydrogen peroxide and iodine solution.

6. A steel product deashing agent according to claim 1, characterized in that: The diffusing agent includes one of sodium methylene bisnaphthalene sulfonate (NNO) and diffusing agent NNF or a mixture of the two.

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