34 results about "Metalworking fluid" patented technology

The invention discloses server base integrated machining equipment for die casting production, and relates to the technical field of base machining, the server base integrated machining equipment comprises a workbench and a movable sliding block, a sliding rail is arranged at the top end of the outer wall of the workbench, the movable sliding block is arranged on the sliding rail, and a nozzle at the top end of the movable sliding block sprays metal working fluid to a base to be machined; the base to be processed is arranged on a polyurethane buffer plate, a rubber buffer plate is arranged below the polyurethane buffer plate, a filter frame is arranged between the polyurethane buffer plate and the rubber buffer plate, the rubber buffer plate is fixed on a workbench, and the workbench is connected with a waste liquid box through a funnel arranged at the bottom end. According to the device, the workbench, the sliding rails, the movable sliding blocks, the sliding wheels, the storage box, the spray heads and a polyurethane buffer plate are installed, lubricating, cooling and cleaning of a server base before machining, during machining and after machining are achieved through movable spraying, manual intervention is greatly reduced, and the production efficiency and the process consistency are improved.

The invention discloses a botanical fungicide for metal working fluid, which is prepared from the following raw materials in parts by weight: malus hupehensis extract, wolf thorn extract and melia azedarach extract according to the mass ratio of 1: (2-4): (2-4). The bactericide is natural in raw materials, can effectively inhibit bacteria, fungi and anaerobic bacteria, has a broad-spectrum bactericidal effect, is good in stability, can effectively avoid the problem of spoilage of the metal working fluid, is good in compatibility with the metal working fluid, is not liable to generate a precipitation reaction with other additives in the working fluid, is not liable to generate drug resistance, and is safe and reliable. The skin irritation risk when workers make contact with the disinfectant can be remarkably reduced, the disinfectant has good biodegradability, is easily decomposed by microorganisms in the natural environment, does not leave lasting chemical residues like traditional bactericides, and is beneficial to achieving the zero emission target.

The invention relates to the technical field of metal working fluids, in particular to a magnesium alloy cutting fluid and a preparation method thereof. The magnesium alloy cutting fluid is prepared from the following components in parts by mass: 6 to 10 parts of alcohol amine, 3 to 6 parts of organic phosphonic acid, 2 to 4 parts of ether carboxylic acid, 1 to 3 parts of waterborne polyether, 2 to 4 parts of phosphate, 1 to 3 parts of special amine, 0.5 to 2 parts of siloxane ketone, 0.5 to 2 parts of waterborne silicone oil, 0.5 to 2 parts of chelating agent, 1 to 3 parts of polyethylene polyamine, 0.1 to 0.5 part of waterborne graphene extreme pressure agent, 0 to 1.2 parts of auxiliary agent and 65 to 85 parts of water. By compounding various lubricants and extreme pressure agents such as alcohol amine, ether carboxylic acid, water-based polyether, phosphate, siloxane ketone, water-based silicone oil and a water-based graphene extreme pressure agent, an effective lubricating film is formed in the cutting process, friction is reduced, cutting force is reduced, formation of built-up edges is inhibited, and the service life of a cutter is prolonged.

Provided is a water-soluble metalworking oil agent which contains two or more amine compounds (A) having a volatilization rate of 20% or less as calculated by formula (i) when heated at 50 DEG C for 48 hours, and a fatty acid (B), and in which the content of an amine compound (X) not belonging to component (A) is less than 5.0 parts by mass relative to 100 parts by mass of component (A) in total. Formula (i): Volatilization rate (%) = ([mass of amine compound before heating]-[mass of amine compound after heating 48 hours]) / [mass of amine compound before heating] * 100.

The utility model relates to the field of metal working fluid cooling, in particular to a metal working fluid cooling device which comprises a cooling box, a box body is fixedly connected to the top of the cooling box, an adjusting assembly is fixedly installed on the left side of the box body, and a discharging pipe is fixedly connected to the bottom of one side of the cooling box. The air cylinder is opened, the air cylinder pushes the connecting plate to move left and right, the connecting plate drives the toothed plate to move left and right, the toothed plate drives the gear to rotate, the gear drives the air guide plate to rotate, the air inlet pipe is fixedly connected to the top of the other side of the cooling box, the air inlets are formed in the tops of the two sides of the box body, and the air outlet is formed in the bottom of the box body. The air direction adjusting effect can be achieved, air can be blown to different positions in the cooling box, the cooling effect of metal working fluid is effectively improved, the requirements of users are met, and the problems that an existing cooling device does not have the air direction control function and can only conduct air blowing cooling in the fixed direction are solved.

The invention relates to metalworking process wherein a metalworking tool processes a workpiece at a processing area of a metalworking machine; a fully synthetic metalworking fluid is supplied to at least one of the metalworking machine, the metalworking tool and the workpiece; the fully synthetic metalworking fluid takes up tramp oil, thus forming a used, tramp oil containing fully synthetic metalworking fluid; the used, tramp oil containing fully synthetic metalworking fluid is collected in a container; one or more quaternary ammonium salts of formula [N+(R1)(R2)(R3)(R4)]n Xn-, wherein residues R1, R2, R3 and R4 are selected from araliphatic and aliphatic hydrocarbon residues, with the proviso that two of residues R1, R2, R3 and R4 are hydrocarbon groups with 1 to 4 carbon atoms and the other two of these residues are hydrocarbon residues with 6 to 20 carbon atoms, Xn- being an n-valent anion, and n being 1, 2 or 3, are added to the used metalworking fluid, thus breaking the emulsion of emulsified tramp oil forming free tramp oil; the free tramp oil accumulates at an air-metalworking fluid interface and is removed thereof. Moreover, the invention relates to a method of removing emulsified tramp oil from its emulsion in a fully synthetic metalworking fluid; and the use of the specific quaternary ammonium salts in such removal step to remove emulsified tramp oil from the fully synthetic metalworking fluid. Furthermore, the invention relates to a fully synthetic metalworking fluid containing said quaternary ammonium salt.

The invention relates to the technical field of metal working fluids, in particular to a polyether amide lubricant, a synthesis method and application of the polyether amide lubricant in the metal working fluids, the synthesis method of the polyether amide lubricant comprises the following steps: carrying out dehydration condensation reaction on dimer acid and polyether amine under the action of a catalyst to obtain a product 1; adding diethylenetriamine into the product 1 for reaction to obtain a product 2; dehydrating the product 2, adding ethylene oxide, and carrying out an alkoxylation reaction to obtain a product 3; and dehydrating the product 3, and carrying out an alkoxylation reaction on the dehydrated product 3 and epoxypropane under the action of a catalyst to obtain the polyether amide lubricant. The prepared polyether amide lubricant is added into a metal working fluid, and the prepared metal working fluid has good lubricity, hydrolysis resistance, defoaming performance, hard water resistance and anti-rust performance.

The invention provides an emulsion lubricant as well as a preparation method and application thereof, and relates to the technical field of emulsion lubricants. The preparation raw materials of the emulsion lubricant provided by the invention comprise an oil phase and a water phase, the water phase comprises triethanolamine borate and water, and the oil phase is sulfurized isobutylene; the mass fraction of the triethanolamine borate in the water phase is 10-40%, and the volume ratio of the oil phase to the water phase is (10: 1)-(1: 1). According to the invention, sulfurized isobutylene is used as an oil phase, triethanolamine borate is used as a surfactant, water is used as a continuous phase, and the ratio of the components is controlled to form a stable emulsion lubricant. The emulsion lubricant is good in stability, not only shows excellent lubricating performance, anti-attrition and wear-resistant performance and biocompatibility, but also has extremely low lung toxicity of aerosol to a natural lung surfactant, can be used as a metal working fluid for metal cutting, forming and other processes, can be used as a drilling fluid for oil field drilling and exploitation operation, and has wide application prospects. As a lubricant, the lubricant is used for lubrication and maintenance of mechanical equipment.

Metal working fluid decontamination apparatus (10) includes: an intake arrangement (40) for metal working fluid (42); a pump (16) for providing, in use, flow pressure to the metal working fluid (42); a decontaminator (50) for reducing contamination in the metal working fluid (42); and an outlet arrangement (34) for the metal working fluid. The metal working fluid (42) is a fully synthetic metal working fluid, which comprises water and a water soluble synthetic concentrate which does not comprise oil.

The present technology relates generally to metalworking fluid compositions including a compound of Formula (I) where R1, R2, R3, and R4 are each independently H or Ci-Ce unsubstituted alkyl; provided at least one of R1, R2, R3, and R4 is not H; and provided that the compound has 4, 5, 6, 7, 8, 9, or 10 carbon atoms. For example, including a compound of Formula I in a metalworking fluid having a pH of at least about 7 may enhance the metalworking fluid's lubricating, cleaning, and / or handling properties by providing multi-metal corrosion inhibition, maintaining pH control, and / or stabilizing the metalworking fluid. When including a biocide, it may act synergistically with the biocide to inhibit microbial growth and disrupt existing biofilms, resulting in extended metalworking fluid life, reduced equipment wear, consistent part quality, and lower environmental load from fluid disposal.

The utility model discloses a material processing roller hanging bracket assembly, and belongs to the technical field of metal processing. Comprising a support, and hoisting connecting pieces are arranged on the two sides of the top of the support; a first rotating shaft assembled and positioned at the bottom of the cross beam is horizontally arranged at the top end in the bracket; two sides of the first rotating shaft are connected with first chain wheels; a hanging bracket mechanism is arranged at the bottom end in the support, a hanging basket is detachably installed in the hanging bracket mechanism, the two ends of the hanging bracket mechanism and the support side plates are assembled and positioned through second rotating shafts, and the second rotating shafts are sleeved with second chain wheels. And the driving mechanism drives the first rotating shaft to rotate. According to the material processing roller hanging bracket assembly, the hanging basket is installed in the hanging frame, then the hanging frame is lifted through the U-shaped frame, the moving stability of the hanging basket is guaranteed, meanwhile, the hanging basket is driven by the rotating mechanism to rotate, metal pieces are processed in the processing pool in a rolling mode, metal processing liquid is made to make full contact with the metal pieces, and the processing efficiency is guaranteed.

The present invention describes an aqueous semi-synthetic metalworking fluid comprising a base oil, an organic acid, an emulsifier, an additive concentrate, water, and a microbial growth control agent comprising a polyfunctional cyclic amine.

The application relates to the technical field of detection equipment, in particular to a metal processing liquid rapid detection box which comprises a box body with an open top and a box cover which can be downwardly buckled at the open top of the box body, a constant-temperature box and a storage box are arranged in the box body in sequence along the horizontal direction, the top of the storage box is provided with a plurality of storage cavities, bacteria detection tablets or rust prevention test boxes are arranged in the storage cavities, the top of the constant-temperature box is provided with a plurality of constant-temperature cavities; the bottom of the box cover is rotationally connected with a rotating plate which can be turned over in the vertical plane, the two ends of the rotating plate are located above the storage cavities and the constant-temperature cavities respectively and can be turned over to above the rotating axis of the rotating plate, the bottom of the rotating plate is slidably connected with a plurality of counterweight units; the counterweight units are rotationally connected with buckling covers which can be turned over in the vertical plane, the bacteria detection tablets and the rust prevention test boxes are slidably connected to the buckling covers through limiting units and can be separated from the buckling covers through self gravity. The application can improve the detection efficiency of the metal processing liquid.

The invention provides environment-friendly magnesium alloy working fluid and a preparation method thereof, and relates to the technical field of metal working fluid. The magnesium alloy working fluid comprises naphthenic mineral oil, an antirust agent, graphene oxide modified fatty acid amide, a glucose gemini surfactant, an emulsifier, an organic corrosion inhibitor, a phosphate corrosion inhibitor, an anti-wear reagent at extreme pressure, a pH stabilizer, a defoaming agent, a bactericide, a lubricant and water. The preparation method comprises the following steps: heating water, sequentially adding the antirust agent, the organic corrosion inhibitor, the pH stabilizer, the naphthenic mineral oil, the graphene oxide modified fatty acid amide, the glucose type bimolecular surfactant and the emulsifier, and continuously stirring; adding other components except the defoaming agent in sequence; slowly adding a defoaming agent, and stirring at a low speed; and stopping heating, stirring and cooling to obtain the product. On the basis of the naphthenic mineral oil and the water, a microemulsion type system is constructed, and a high-temperature environment required by combustion of the magnesium chips is eliminated from the source, so that the safety of the processing process is greatly improved.

This invention belongs to the field of metalworking fluid technology, specifically relating to a water-based cutting fluid and its preparation method. The preparation method of the water-based cutting fluid of this invention includes the following steps: S1, adding composite modified graphene, molybdenum disulfide, and a dispersant to deionized water for homogeneous dispersion to obtain a dispersion; S2, adding a lubricant, a metal rust inhibitor, a corrosion inhibitor, benzotriazole, and tetrasodium diaminetetraacetate to the dispersion, heating and stirring, and cooling to room temperature to obtain the water-based cutting fluid; the composite modified graphene is prepared by using graphene oxide and cerium chloride heptahydrate as raw materials to prepare cerium-doped graphene, and then modifying the cerium-doped graphene with dopamine hydrochloride to obtain the composite modified graphene. This invention can effectively improve the resistance to damp heat and friction of water-based cutting fluids and achieve a good corrosion resistance rating.

To provide a lubricating oil composition having improved extreme pressure performance.SOLUTION: The lubricating oil composition contains a lubricating base oil, a sulfur-containing compound and a metal soap. The lubricant composition according to claim 1, wherein the metallic soaps are one or more selected from the group consisting of aliphatic acid metallic salts represented by the following general formula (2-1), aliphatic acid borate metallic salts represented by the following general formula (2-2), and amine ligand metallic complex compounds of the aliphatic acid metallic salts and amine compounds (M21 and M22 are each independently Li, Na, K, Mg, Ba, Bi, Cu, Pb, Zn, Zr or Co). ).SELECTED DRAWING: None

The utility model relates to a kind of metalworking cooling liquid filtration systems, including primary water tank, secondary water tank, magnetic separation device, vortex separator, refrigerating unit, magnetic lift pump and vortex lift pump, the bottom of primary water tank is conical, primary water tank bottom is also equipped with blowdown, magnetic lift pump is used to pump the cooling liquid in the primary water tank into the magnetic separation device, the liquid outlet of the magnetic separation device is communicated with the secondary water tank, vortex lift pump is used to pump the cooling liquid in the secondary water tank into the vortex separator, vortex separator includes clean liquid outlet, the clean liquid after the vortex separator filtration enters the secondary water tank by the clean liquid outlet. The bottom of primary water tank is conical, and is equipped with blowdown, impurity deposited in the bottom of primary water tank can naturally slide under the action of its gravity and converge to the blowdown at the lowest point of cone bottom, solve the problem of the hidden corner that is difficult to clean of traditional rectangular water tank.

The utility model discloses a metal working fluid feeding device which comprises a tank body, and a motor is arranged on the top of the tank body. The bottom of the motor is connected with the inner end of a rotating rod through a bevel gear set, the middle of the rotating rod is rotationally arranged on a storage groove in a penetrating mode, the storage groove is formed in the top of the tank body, a first spring is nested in the inner end of the rotating rod, and the outer end of the first spring is connected to the top of the tank body; the inner end of the first spring is connected to the outer end of the bevel gear set, a sealing plate is fixed to the middle of the rotating rod, and the outer wall of the sealing plate is attached to the inner wall of the storage tank to form a sealing mechanism. The metal working fluid feeding device is provided with the sealing plate, the rotating rod is driven by the motor to rotate, so that the rotating rod can drive the sealing plate to rotate, then the purpose of quantitatively feeding materials in the storage tank can be achieved through the sealing plate, the machining efficiency is improved, and the use convenience is further improved.

The utility model discloses a cooling device for producing metal working fluid, which relates to the technical field of metal working fluid production and comprises a cooling device body for cooling metal working fluid and a cooling component. The cooling device body comprises a fan body, an air inlet pipe, an air outlet pipe and a support frame; the air inlet pipe is fixedly arranged at the air inlet end of the fan body; the air outlet pipe is fixedly arranged at the air outlet end of the fan body, and a plurality of air outlets are formed in the air outlet pipe; the two supporting frames are symmetrically and fixedly arranged on the air inlet pipe and the air outlet pipe; the cooling assembly is arranged on the air outlet of the air outlet pipe; the cooling assembly comprises a cooling block and a cooling groove; the cooling block is fixedly arranged on the air outlet of the air outlet pipe; according to the cooling device for producing the metal working fluid, the structure is simple and reasonable, the design is ingenious, the cooling efficiency of the metal working fluid can be improved by converting normal-temperature air into cold air, the metal working fluid is cooled in a mechanical mode, and the durability of the cooling device body can be improved.

The utility model discloses an aqueous metal working fluid stock solution stability detection device, which is characterized in that a heating table is provided with a plurality of heat conduction areas at the position of a cavity, the heating table is provided with heat conduction plates at the positions of the heat conduction areas, and semiconductor heating sheets and semiconductor refrigeration sheets are arranged in the heating table and on the lower surfaces of the heat conduction plates; the lower surface of the heating table is connected with the upper surface of the aluminum alloy radiating fin through bolts, fins are uniformly arranged on the lower surface of the aluminum alloy radiating fin, and the plurality of radiating fans are respectively connected with the lower surface of the aluminum alloy radiating fin. When the semiconductor heating sheet is used for heating, the operation stability and the service life of the device are guaranteed, meanwhile, the cooling fan is used for direct supporting, a support does not need to be built, cost and time are saved, the stability of multiple products can be detected at the same time, and efficiency is greatly improved.

The utility model provides a metal working fluid multistage circulating filtering device which comprises a filtering frame shell, a filtering net cylinder and a filtering net plate, the filtering net cylinder and the filtering net plate are both connected to the side wall of an inner cavity of the filtering frame shell, the filtering net cylinder is arranged above the filtering net plate, and the filtering net plate is arranged above the filtering net cylinder. The filter screen cylinder and the filter screen plate are used for performing multi-stage filtration on the metal working fluid; and the metal working fluid can be scattered through the scattering assembly, and the contact area of the metal working fluid and the filter screen cylinder is increased. According to the metal working fluid filtering device, the metal working fluid can be filtered in a multi-stage mode through the filtering net cylinder and the filtering net plate, the filtering effect is good, the metal working fluid can be scattered through the scattering assembly, the metal working fluid can make more comprehensive contact with the filtering net cylinder, and the filtering efficiency of the filtering net cylinder can be effectively improved.

This invention provides a metalworking fluid suitable for long-term magnesium ion accumulation conditions, its preparation method, and its application. The metalworking fluid comprises a basic lubricating component, functional additives, a surfactant, a pH adjuster, a corrosion inhibitor, and water. The functional additives include any one or a combination of at least two compounds with the structure shown in Formula I. The metalworking fluid provided by this invention establishes a synergistic mechanism between magnesium ion regulation and metal surface corrosion inhibition by introducing an additive structure with synergistic functions of chelating and corrosion-inhibiting ends. This allows the fluid to maintain relatively stable corrosion inhibition performance and system state during long-term cyclic use, thereby extending the effective service life of the fluid and reducing the risk of corrosion and hydrogen evolution.

The invention relates to the technical field of metal working fluids, in particular to a special cutting fluid for aluminum alloy and a preparation method thereof. The special cutting fluid for the aluminum alloy comprises the following components in parts by weight: 10-20 parts of a synthetic ester lubricant, 3-8 parts of a composite corrosion inhibitor, 5-12 parts of a surfactant, 2-5 parts of a coupling agent, 1-3 parts of a metal deactivator, 3-8 parts of a pH regulator, 0.5-2 parts of a preservative, 0.1-0.5 part of a defoaming agent and 50-80 parts of deionized water. The prepared cutting fluid can form a compact molecular protective film on the surface of the aluminum alloy, and pitting corrosion and discoloration phenomena caused by moisture, oxygen and machining stress are effectively prevented.

The utility model relates to a metal working fluid cooling device, which belongs to the technical field of metal working fluid cooling and comprises a hollow tank body, a cooling pipe is arranged inside the hollow tank body, a water inlet and an air outlet are arranged above the outside of the hollow tank body, a water outlet and an air inlet are arranged at the lower end of the outside of the hollow tank body, and a liquid inlet and a liquid outlet which are communicated with the cooling pipe are arranged on the outer side of the hollow tank body. Through combination of water cooling and air cooling, the metal working fluid in the cooling pipe is rapidly and efficiently cooled, the cooling time is effectively shortened, and the situation that the cooling time of the metal working fluid is interfered by the temperature outside the outer tank body is effectively eradicated through a hollow layer formed by the inner tank body and the outer tank body.

The application discloses a detection device with impurity filtering function for metal processing liquid production, and relates to the technical field of metal processing liquid detection.The detection device comprises a shell, a temperature adjusting device, a test device and a filter screen, the shell is provided with a temperature adjusting cavity and a detection cavity, the temperature adjusting device is arranged in the temperature adjusting cavity, the test device is connected with the detection cavity, the temperature adjusting cavity and the detection cavity are arranged in sequence along the conveying direction of the metal processing liquid, and the filter screen is connected with the temperature adjusting device.The shell serves as a main installation base, the produced metal processing liquid is guided into the temperature adjusting cavity during the production and processing of the metal processing liquid, and is automatically temperature adjusted first to prevent temperature fluctuation from affecting the detection precision of lubricity;after the automatic temperature adjustment, the metal processing liquid is sent into the detection cavity, the lubricity of the metal processing liquid is automatically detected through the test device, the filter screen is fixed through the temperature adjusting device, and thus the metal processing liquid is automatically filtered, so that impurities are prevented from entering the detection cavity and affecting the detection precision of lubricity.

The invention relates to the technical field of metal processing lubrication, in particular to a biological stable multifunctional cutting fluid and a preparation method thereof. The biological stable multifunctional cutting fluid is specifically prepared from the following components in parts by weight: 20 to 30 percent of base oil, 10 to 20 percent of vegetable oil, ethylene oxide and propylene oxide segmented copolymer, 5 to 10 percent of lubricating agent, 2 to 5 percent of extreme pressure anti-wear agent, 4 to 10 percent of antirust agent, 0.3 to 2 percent of antibacterial agent, 0.6 to 1 percent of nano additive, 0.1 to 0.3 percent of antioxidant, 0.1 to 0.5 percent of triethanolamine and the balance of water. By adding all the components, the synergistic effect can be achieved, the overall performance of the cutting fluid is improved, an efficient and stable lubrication-emulsification synergistic system is formed through compounding, a super-strong lubricating film is constructed in situ in a metal working fluid, and meanwhile the excellent emulsification stability, cooling performance, biological stability and biodegradability are considered.

This application provides an environmentally friendly microemulsion cutting fluid, relating to the field of metalworking fluid technology. This cutting fluid aims to solve the problems of poor environmental performance, low safety, easy corrosion of certain metals, and short service life caused by the presence of harmful substances such as boron, chlorine, and formaldehyde in existing cutting fluids. The environmentally friendly microemulsion cutting fluid provided in this application, by weight percentage, consists of the following components: base oil 10-15%; emulsifier 5-10%; triethanolamine 10.5-16%; dodecanoic acid 1-5%; extreme pressure anti-wear agent 1-5%; rust inhibitor 1-5%; bactericide 1-2%; defoamer 0.5-1%; deionized water: balance; wherein the cutting fluid does not contain boron, chlorine, or formaldehyde. Through a scientific formulation system, this invention achieves excellent lubrication and extreme pressure performance, multi-metal corrosion resistance, and long-lasting antibacterial stability without containing boron, chlorine, or formaldehyde, solving the technical problem of traditional cutting fluids corroding aluminum alloys. It has the advantages of being environmentally friendly and safe, having excellent performance, wide material compatibility, and long service life.

To provide a metalworking oil agent gelling inhibition method which can well inhibit a metalworking oil agent from gelling.SOLUTION: A metalworking oil agent gelling inhibition method includes a step of mixing water, an unsaturated hydrocarbon compound having an HLB of 8.0 or less, and an oil agent including a saturated hydrocarbon compound, where the content of the water is 5.0 wt.% or more and 7.0 wt.% or less.SELECTED DRAWING: None

The invention provides a low-spontaneous-combustion-risk water-based cutting fluid concentrated solution for aluminum alloy multi-wire cutting and a method, and belongs to the technical field of metal working fluids. The scheme aims to solve the problems of spontaneous combustion risk of high-activity aluminum powder in aluminum alloy multi-wire cutting and high cost and unstable operation in the prior art. The concentrated solution comprises an aqueous base solution and a synergistic composite passivation system, wherein the system is composed of an inorganic synergistic passivator group A and an organic synergistic passivator group B; the component A is selected from phosphate, silicate or borate; and the component B is selected from C6-C12 saturated dicarboxylic acid or salt thereof and hydroxy carboxylic acid or salt thereof. The method comprises the step of supplying the water-based cutting fluid formed by diluting the concentrated solution to a cutting area. Through the synergistic effect of the inorganic passivator and the organic passivator, a compact composite protective film is formed on the surface of the aluminum powder, spontaneous combustion can be efficiently inhibited, the cost is reduced, and the operation stability is guaranteed.

The present invention relates to a use of an aqueous solution for the reduction or the prevention of corrosion, in particular staining, on metal surfaces, which are at least partially made of aluminum and / or at least one kind of an aluminum alloy, characterized in that the solution contains, besides water, at least one polyol comprising at least three hydroxyl groups, wherein at least one hydroxyl group thereof is a primary hydroxyl group and the polyol comprises no or essentially no nitrogen atoms, and wherein the aqueous solution does not or essentially does not comprise mono alcohols, diols and polyols comprising nitrogen atoms, a metal working fluid composition comprising inter alia said polyol, a method for processing substrates with at least one metal surface which is at least partially made of aluminum and / or at least one kind of an aluminum alloy, by making use of at least one metalworking tool, wherein the method makes use of the aqueous solution or of the metal working fluid composition, and a processed substrate obtainable by this method.