66results about How to "Avoid over corrosion" patented technology

The invention discloses a detergent and a cleaning method for a complete air-conditioner, which not only can uniformly and completely remove dirt but also cannot strongly corrupt components and parts such as aluminum, copper and stainless steel, are time-saving and labor saving, safe and reliable, and pollution-free, and have low cost. Raw materials of the detergent are at least two compositions of citric acid, inorganic weak acid and inorganic strong acid; a non-ionic surfactant or a non-ionic surfactant is mixed with an anionic surfactant; and the detergent comprises an oxygen solvent, an acid corrosion inhibitor, and the balance being water. The cleaning method comprises: disassembling a motor and a fan, and taking off the motor and the fan for independent cleaning; preparing the detergent into an aqueous solution according to the proportion of between 10 and 15 percent, hanging the complete air-conditioner after disassembly of the motor and the fan into a cleaning tank, soaking the complete air-conditioner for 30 minutes at normal temperature, and starting ultrasonic waves to clean for 10 to 30 minutes; placing the complete air-conditioner into a washing tank, and using a high-pressure water gun to spray the surface and the inside of the air-conditioner; and using hot blast to dry the air-conditioner at a temperature of 80 DEG C.

The invention discloses a polishing solution for chemically and mechanically polishing a cobalt barrier layer structure and applications thereof. The polishing solution comprises the following components in percentage by weight: 0.01 to 20 wt% of grinding particles, 0.01 to 10 wt% of oxidant, 0.01 to 10 wt% of metal complexing agent, 0.005 to 5 wt% of metal corrosion inhibitor, 0.001 to 1 wt% of surfactant, and the balance being water. The polishing solution can form a layer of protective passivation film on the surface of cobalt and copper so as to prevent over-corrosion during the polishing process, can reduce the removal rates of cobalt and copper materials, and obtains the removal rate selectivity of an adjustable material.

The invention discloses a stainless steel surface scale removal method and a pickling solution adopted by the same. The pickling solution is a water solution composed of 100-300 ml/L dilute sulfuric acid, 1-5 g/L auxiliary acid, 1-5 g/L surfactant, 1-5 g/L brightening agent and 1-5 g/L corrosion inhibitor. The auxiliary acid is one of citric acid, oxalic acid, nicotinic acid and phytic acid. The surfactant is coconut oil fatty acid and/or nonylphenol polyethenoxy ether. The brightening agent is sodium hexametaphosphate or ethylenediamine tetraacetic acid. The corrosion inhibitor is one of sulfosalicylic acid, thiocarbamide, urotropine and urea. The pickling solution is environment-friendly, can prevent the stainless steel base from over corrosion, and especially can simultaneously remove grease on the stainless steel surface.

The invention discloses a copper cleaning agent and a preparation method thereof. The copper cleaning agent disclosed by the invention consists of an inorganic acid, an organic acid, a surfactant, a penetrating agent, an emulsifier, a defoaming agent, a complexing agent and water. The inorganic acid and the organic acid are compounded, the hazards to health of cleaning workers caused by individual use of the inorganic acid in the traditional cleaning agent are avoided, over etching of a copper workpiece is also avoided, the copper cleaning agent is an environmental-friendly cleaning agent and has a certain oiliness, an effect of cleaning dirt such as oil attached to the surface of a copper part is improved by using the cleaning agent, the cleaning agent solution is acidic, and the oxide skin on the surface of the copper part can be well removed. The cleaning agent prepared by the invention is simple in using method, the copper part only needs to be soaked at normal temperature for 2-5 minutes so as to be cleaned, no greasy dirt residue is left on the cleaned copper part, the color of the surface of the copper part is the copper base color, and the cleaning effect is obvious. The copper cleaning agent disclosed by the invention is simple in preparation method, low in cost and obvious in effect and is suitable for industrial production and application.

The present invention provides method of raising binding force of chemical coating on the surface of NdFeB permanent magnet. The NdFeB permanent magnet is pre-coated in alkaline plating solution under ultrasonic action, and by means of the activation, cavitation and stirring of ultrasonic wave, one homogeneous and compact initial deposited layer is formed on the surface of the magnet, so as to raise the binding force of chemical nickel-base coating on the surface of the magnet obviously and reduce pores in the coating. The present invention also provides the technological process including deoiling and pickling to activate before plating, the ultrasonic pre-plating and the conventional chemical plating. The formed coating has high corrosion resistance, raised binding to the substrate and perfect protection on the NdFeB permanent magnet.

The invention discloses an alkaline cleaner for removing simple substance mercury in a natural gas separator and a cleaning technique thereof, which can thoroughly remove residual paraffin in the separator, converts the simple substance mercury into non-volatile compound, avoids corrosion for carbon steel and stainless steel, and has the advantages of low cost and no pollution. The alkaline cleaner contains the raw materials by weight percent: at least two of 1-40% of sodium sulfide, 0.1-15% of sodium polysulfide and 1-35% of sodium thiosulfate, at least one of 0.1-10% of sodium nitrate, sodium phosphate and sodium sulfate, at least one of 0.1-15% of sulfuric acid and phosphoric acid, 0.5-20% of non-ionic surface active agent, 0.5-10% of anion surface active agent, 0.5-15% of oxygen-containing solvent, 0.1-10% of inhibiter and less than or equal to 90% of water; and the pH value is more than 10.0.

The present invention relates to a comprehensive treatment agent, which comprises, by mass, 25.0-30.0% of phosphoric acid, 1.0-3.0% of zinc oxide, 0.1-0.5% of sodium molybdate, 4.0-7.0% of zinc dihydrogen phosphate, 0.3-1.2% of potassium chlorate, 0.3-1.2% of a surfactant, 0.0-2.3% of triethanolamine, 0.8-2.3% of citric acid, 0.1-0.3% of thiourea, and 58.0-62.6% of water. According to the present invention, the treatment agent can be recycled, a treatment cost is low, and pollution on the environment can not be generated.

The invention discloses a hot galvanizing process. The hot galvanizing process is characterized in that thiourea with concentration being 0.12% is added during pickling, wherein a picking temperature is 50 DEG C, so that a workpiece can be prevented from being over-etched, and hydrogen absorption capacity of ferro matrix can be reduced; an ultrasonic cleaning agent with concentration being 7.5% is added during ultrasonic cleaning, so that greasy dirt and corrosion on the surface of a workpiece can be quickly removed; the ultrasonic cleaning agent is trichloro ethylene which does not contain phosphate, is harmless to aquatic life, is harmless to a human body and is free of stimulation on skin; the cooling comprises the following two steps: a first step, slow cooling, wherein a cooling speed is 10 DEG C/S, and the workpiece is cooled to a temperature of 650 DEG C; and a second step, quick cooling, wherein the workpiece is cooled by a cooling fan, and is cooled to a temperature of 445 DEG C, so that the structure of the workpiece can be prevented from being damaged; pure aluminum with concentration being 0.02% is added into a zinc pot before galvanizing, so that mobility, at a relatively low temperature, of a hot galvanizing solution is improved, a coating is prevented from being thickened, and the appearance of the coating is improved; a bearing produced by adopting the method has the advantages of corrosion resistance, great bonding strength of a galvanized coating and long usage time, is great in market potential and is wide in prospect.

The present invention relates to a multifunctional preparation for rust prevention and corrosion inhibition, which is prepared by the following method: 1) first add 597g of water into a 1000ml beaker, then add 217g of metal corrosion inhibitor, and stir for 3-4 hours at room temperature; 2) add 83g of borate coupling agent, stirred at room temperature for 1-1.5 hours; 3) Finally, 103g of titanate coupling agent was added, stirred for 2-3 hours to obtain the antirust and corrosion inhibitor. The antirust performance of the present invention is carried out according to the antirust test standard, and there is no rust on the inner metal surface within 24 hours, and there is no change on the surface. After using the present invention, the paint adhesion is significantly enhanced. According to the cross-cut test standard of GB/T 9286-1998 paint and varnish paint film, the paint film adhesion grade is 0 grade. The invention has excellent corrosion inhibition function, and the pure hydrochloric acid is added in a ratio of 0.3-0.5%, which can effectively prevent metal over-corrosion.

The invention discloses stainless steel electrochemical polishing liquid and a polishing process, and relates to the technical field of surface electrochemical polishing of stainless steel equipment or products, in particular to the stainless steel electrochemical polishing liquid and the polishing process. The stainless steel electrochemical polishing liquid comprises compositions including, by weight, 15%-25% of sulfuric acid, 20%-35% of citric acid, 3%-10% of ethylene glycol, 1%-3% of ethylene diamine tetraacetic acid, 0.1%-0.5% of polyvinylpyrrolidone and the balance water. According to the stainless steel electrochemical polishing liquid and the polishing process, the sulfuric acid is a strong inorganic acid, has good dispersibility, can be completely ionized in the solution, helps toimprove the conductivity, dispersing ability and anode current efficiency of the polishing liquid and uniformly polishes the surface of the stainless steel; the citric acid has low acidity and high viscosity to prevent corrosion of the stainless steel; and the ethylene glycol is absorbed on the surface of the anode, formation of a diffusion layer is promoted, a film can be formed on the surface of the stainless steel together with citric acid to prevent over-corrosion of the stainless steel, and the polished stainless steel surface is bright and meticulous, and the reflectivity is greater than 98%.

The invention discloses an alkaline chemical milling machining and polishing method for aluminum alloy. The method comprises the steps of chemical degreasing, alkaline corrosion treating, deoxidation treating, protection glue applying, drying, curing, carving, alkaline chemical milling machining, polishing treating, cleaning and drying. According to the method, a bright and smooth surface can be obtained on the surface of 2,000-series aluminum alloy, a protection film capable of effectively preventing over corrosion can be formed on the surface of a substrate after chemical milling machining and polishing treatment is conducted, and the surface is not liable to be oxidized after being cleaned. A polishing solution is easy and convenient to prepare, low in cost, environmentally friendly and capable of preventing over corrosion.

The invention discloses a copper detergent which is composed of the following raw materials: 15-20 parts of metatitanic acid, 15-20 parts of thiosulfuric acid, 15-20 parts of phosphorous acid, 20-25 parts of fluoboric acid, 8-10 parts of zinc hydroxide, 5-10 parts of aluminum sulfate, 15-18 parts of phosphoric acid, 5-10 parts of tartaric acid, 8-10 parts of oxalic acid, 3-5 parts of cocooctyl phenol polyethenoxy ether, 5-6 parts of fatty alcohol polyethenoxy ether, 5-8 parts of isoalcohol polyethenoxy ether, 4-5 parts of diethylene glycol aether, 5-7 parts of glycol ether acetate, 6-8 parts of propylene glycol methyl ether acetate, 6-8 parts of emulsified silicone oil, 8-10 parts of polydimethylsiloxane, 6-8 parts of glycerol, 3-5 parts of ethylene glycol monophenyl ether, 4-5 parts of sodium alginate, 5-6 parts of ammonium citrate and 200-250 parts of deionized water. The copper detergent lowers the consumption of three industrial strong acids, lowers the health hazard to the operating personnel and avoids generating over etching on the copper substrate. After being cleaned by the copper detergent and flushed with distilled water, the copper part has the advantages of uniformly distributed surface water film and no oil stain residue.

The invention provides a pretreatment method for plating or chemically plating tungsten alloy and a chrome plating method for the tungsten alloy. According to the pretreatment method for plating or chemically plating the tungsten alloy, the pretreatment method of chemical degreasing, strong corrosion and nickel preplating is adopted, and an appropriate solution formula and technological parameters are selected; under the condition that a base body is not corroded, oil on the surface of the tungsten alloy is removed, an oxide film and a natural passive film are removed uniformly, and an excellent base body surface is obtained; in addition, a compact nickel layer is formed on the surface of the tungsten alloy through an appropriate preplating solution and technological parameters, the follow-up obtained binding force of a plating layer is increased, and the properties such as high binding force, abrasion resistance and oxidation resistance of chrome or other metal are ensured; the pretreatment method is stable, not only suitable for the chrome plating treatment of the tungsten alloy material, but also suitable for other plating pretreatment and chemical plating pretreatment of the tungsten alloy material; the plating layer is obtained after plating, and the phenomena of peeling and shedding of the plating layer are not existed.

The invention provides a washing agent for electrical copper braided wire. The washing agent comprises the following chemical components in percentage by weight: 20 to 25% of scale and corrosion inhibitor, 1 to 5% of sodium tripolyphosphate, 0.5 to 3% of sodium citrate, 2 to 5% of trichloroethane, 10 to 20% of polyacrylic acid, 15 to 30% of phosphoric acid, 10 to 18% of fatty acid glyceride, 5 to 12% of osmotic agent, 3 to 5% of emulsifier, 2 to 6% of antifoaming agent, and the balance being water. The washing agent is nontoxic and environment-friendly, can effectively wash off the copper scales on the surface of electrical copper braided wires after oxidation, and can form a protective film on the surface of electrical copper braided wires after washing, because the film is uniform and compact and is hard to peel off, the electrical copper braided wire has a very good performance on preventing fading and oxidation therefore, the preservation time and service life of electrical copper braided wire are both prolonged, and the production cost is reduced.

The invention discloses a treatment process before plating an environment-friendly copper alloy. The treatment process comprises the following four steps: (i) using a water-based cleaning agent to deoil; (ii) rinsing the copper alloy in cold water; (iii) ultrasonically immersing the copper alloy in phytic acid; and (iv) ultrasonically rinsing the copper alloy in deionized water. The invention adopts the phytic acid for the ultrasonic using treatment process before plating the copper alloy, not only can thoroughly remove an oxide film on the surface of a basal body of a plating article and activates the basal body, but also can avoid over eroding the basal body of the plating article, achieve the environmental-protection requirement in aspects of operation environment, sewage drain, and the like and greatly decrease the production cost.

The invention discloses an air conditioner aluminum fin weak alkaline cleaner which can evenly and thoroughly remove dirt, cannot generate high corrosion on aluminum fins, saves time and labor, and islow in cost, safe, reliable and free of pollution. The air conditioner aluminum fin weak alkaline cleaner comprises raw materials including, by mass percent, 1%-5% of citric acid, 0.1%-15% of sodiummetasilicate pentahydrate, 0.1%-5% of sodium carbonate, 0.1%-10% of sodium gluconate, 0.5%-20% of a non-ionic surface active agent, 0.5%-10% of a cationic surface active agent, 0.5%-15% of an oxygen bearing solvent and the balance water; and the pH value is 10.0-10.5. The cleaning method includes the following steps that the aluminum fins on an air conditioner in a train are detached; the cleaneris prepared into an aqueous solution according to the mass percent being 10%-15%, the detached aluminum fins are hoisted into a cleaning tank, soaking is carried out for 30 min at the normal temperature, ultrasonic cleaning is started to last for 10 min-30 min; the aluminum fins of the air conditioner are placed into a washing tank, a water torch is used for spraying and cleaning the surfaces of gaps of the aluminum fins of the air conditioner; and the aluminum fins are placed to be dried.