62results about How to "Short passivation time" patented technology

The invention relates to a non-chromium passivation technique and passivation solution of an aluminum pipe. The aluminum pipe is used for evaporators of ice refrigerators and ice chests. The invention belongs to the aluminum material surface treatment technical field. The invention aims at promoting the corrosion resistance of the aluminum pipe for evaporators of ice refrigerator and ice chest, etc. The continuous extrusion shape aluminum pipe is cooled off and quickly passivated in the passivation solution under the temperature from 20 DEG C to 90 DEG C. A tier of passivated film is formed on the surface of the aluminum pipe through airing and solidifying. The passivation solution contains passivant alkyl phosphate ester. The mass concentration of the passivant alkyl phosphate ester is from 1 percent to 15 percent. The mass concentration of the silane coupler is from 0.1 percent to 0.5 percent. The mass concentration of the sodium silicate is from 0.01 percent to 0.15 percent. The rest of the passivation solution is water. The passivated aluminum pipe is dried through wind under 20 DEG C to 60 DEG C and packed through the turn plate. The technique of the invention has the advantages of simple process, low cost and high speed, and the corrosion resistance of the passivated aluminum pipe is greatly promoted, and pharmaceuticals and passivation process has the performance of safety and environmental protection.

A continuous annealing and acid washing method for medium-chromium ultrapure ferrite stainless steel comprises the process flow of cold rolling, annealing heat treatment, acid washing, final water washing, drying, flattening and packaging, and is characterized in that in the acid washing process flow, the acid washing solution is prepared from 120-150g/L of 65% nitric acid, 2-4g/L of 40% hydrofluoric acid and water. According to the invention, in the chemical acid washing stage, reasonable concentration ratio of nitric acid to hydrofluoric acid is adopted and proper acid washing speed is controlled to carry out acid washing on medium-chromium ferrite stainless steel. As a result, on one hand, the performance of a medium-chromium ferrite stainless steel passivation film is obviously improved, and the corrosion resistance of the surface of a medium-chromium ferrite stainless steel 2B board is significantly improved, and on the other hand, the process flow of the existing production factory is not needed to be changed, a special passivation treatment procedure is not needed, and the production cost is significantly lowered.

The invention discloses a ferrous sulfide gas phase passivation device. The gas phase passivation device contains a steam supply part, an oxygen supply part and a sealing part. The gas phase passivation device is connected with a tail gas treatment device and a data analysis device respectively to perform gas phase passivation to a petrochemical device. The steam supply part contains a water softener, a steam generator, a steam flowmeter and an oxygen valve. The oxygen supply part contains a compressed oxygenized air bottle, a gas flowmeter, an oxygen inlet valve and an oxygen valve. The sealing part contains a packed tower, a tail gas valve and a gathering tank valve. Compared with the liquid phase passivation method in the prior art, the phase passivation method of the invention mainly uses oxygenized air, is convenient to use and has lower cost. Waste gas is easy to treat. The waste gas which is easily treated through gas phase passivation can meet the emission standard. The treatment time is short; and passivation can be performed evenly and the channeling phenomenon does not exist.

The invention discloses an environment-friendly composite colorful passivating solution and a preparation method thereof and belongs to the technical field of surface treatment of metal materials. Thepassivating solution comprises the components of 17-22 g/L of sodium silicate, 4-8 g/L of sodium molybdate, 6-10 g/L of sodium nitrate, 3-7 mL/L of hydrogen peroxide, 1-3 g/L of potassium fluoride, 2-6 mL/L of nitrilotrimethylene triphosphonic acid, 2-4 g/L of sodium gluconate, 2-4 mL/L of tartaric acid and the balance water, wherein the pH value of the passivating solution is 2.0-2.5. The preparation method of the passivating solution comprises the steps that the sodium silicate, the sodium molybdate, the sodium nitrate, the potassium fluoride, the nitrilotrimethylene triphosphonic acid, thesodium gluconate, the tartaric acid and the hydrogen peroxide are sequentially added into deionized water to be evenly mixed; the water with the constant volume is added to the needed volume; and sulfuric acid is used for adjusting the pH value to be 2.0-2.5, and thus environment-friendly composite colorful passivating solution is obtained. A galvanized layer passivated film treated by the passivating solution is colorful, bright in color, even in film forming and excellent in corrosion resistant performance; the passivating solution does not contain trivalent chromium, hexavalent chromium and other harmful substances and is environmentally friendly, free of pollution, simple in passivating process and high in passivating efficiency, and the corrosion resistance of a film layer is good.

The invention discloses a surface plasma treatment process for a tooth roller of a flour mill. The surface plasma treatment process comprises the following steps of (1) surface polishing, (2) grease removing treatment, (3) washing treatment, (4) passivating treatment, (5) washing and drying and (6) plasma treatment. According to the surface plasma treatment process, the surface of the tooth roller is subjected to passivating treatment first, added modified nano diatomaceous earth and nano silicon dioxide improve the evenness, compactness and stability of a passivation film, and meanwhile a good antibacterial effect is achieved by the passivation film; plasma treatment is conducted after passivating treatment so that fusing of the passivation film and a substrate of the tooth roller can be improved and the hardness and the corrosion resistance of grinding teeth of the tooth roller can also be improved, and the finally the treated tooth roller has excellent strength, corrosion resistance and antibacterial and antirust performance. Compared with an existing tooth roller, the service life is prolonged by 10-12 times, flour yield is improved by about 30%, the power consumption of each ton of flour is reduced by 15-18 KW.h, and the economic benefit is obviously improved.

The invention discloses a reduction method of a copper-based catalyst for hydrogen production from methanol reforming. The reduction method comprises the following steps: firstly, taking heat-conduction oil as a heating source, taking air with a heating space velocity of 100-500 h<-1> as a heat carrier, heating a catalyst bed layer in a converter to 160 DEG C, then heating the catalyst bed layer in the converter to 230 DEG C by using water vapor, and reducing the catalyst by using a methanol water mixed solution with a methanol mass concentration of 2-3%. The reduction method is used to solvethe technical problem that a conventional method is complex in process, large in investment cost, and long in heating time. The invention further discloses a passivation method of the copper-based catalyst for hydrogen production from methanol reforming. The passivation method comprises the following steps: the temperature in the converter is kept at 150-160 DEG C by using saturated water vapor under a normal pressure condition; a proper amount of an air passivation catalyst is added into gas in the convertor under a condition that the temperature in the converter is maintained to be not higher than 160 DEG C; and after the gas is completely converted to air, the temperature is reduced to room temperature, so that the passivation of the catalyst is realized. The passivation method is usedto solve a technical problem that a conventional N2-air passivation method is difficult to control and time consumption is large.

The invention discloses a silicate blue-white passivation solution and a preparation method thereof, and belongs to the technical field of metal material surface treatment. The silicate blue-white passivation solution consists of 26-34g/L of sodium silicate, 2-4g/L malic acid, 8-12g/L sodium fluoride, 9-14mL/L hydrogen peroxide, 8-13mL/L amino trimethylene phosphonic acid and the balance water, and the pH of the silicate blue-white passivation solution is 3.0-3.5. The preparation method of the silicate blue-white passivation solution comprises the steps that sodium silicate, malic acid, sodiumfluoride, amino trimethylene phosphonic acid and hydrogen peroxide are sequentially added to deionized water and are mixed uniformly, water is added for constant volume treatment till the required volume is reached, and the pH is adjusted to 3.0-3.5 by adopting sulfuric acid, thus the silicate blue-white passivation solution is obtained. A zinc coating passivation film after the treatment by thesilicate blue-white passivation solution is blue-white, and is bright in color, the film forming is uniform, and the corrosion resistance is excellent; the silicate blue-white passivation solution isfree of trivalent chromium, sexavalent chrome and other hazardous materials, so that the silicate blue-white passivation solution is environment-friendly and pollution-free; a passivation technology is simple; the passivation efficiency is high; and the film layer corrosion resistance is good.

The invention provides a corrosion resistant natural color passivation solution for an aluminum alloy die pressed casting. The passivation solution is prepared from the following components in percentage by mass: 1 to 10 percent of trivalent chromium salt, 1 to 8 percent of zirconium salt compound, 0.1 to 5 percent of mixed accelerant, 0.01 to 0.05 percent of surfactant and the balance of water, wherein the mixed accelerant is a mixture of cobalt salt, sodium fluoride and sodium nitrate with a mass ratio of (0.5 to 2) to (0.5 to 2) to (5 to 15). The invention also provides a preparation methodof the passivation solution and a method for performing corrosion resistant natural color passivation treatment on the surface of the aluminum alloy die pressed casting. A film obtained by the methodhas natural color, is uniform and dense, has strong corrosion resistance and good conductivity and does not affect natural color metal texture of die-cast aluminum.

The invention discloses a gas-phase passivation system for a petrochemical device. The gas-phase passivation system comprises a gas-phase passivation device, a tail gas treatment device and a data analysis device, wherein the tail gas treatment device is connected with the gas-phase passivation device and is used for treating harmful gases generated in a passivation process; the tail gas treatment device further comprises a lye tank in which 10 percent sodium hydroxide solution is accommodated, a tail gas valve and an exhausting valve; the data analysis device is connected with the gas-phase passivation device and is used for detecting data of combustible gases before gas-phase passivation and linearly detecting the concentration of sulfur dioxide (SO2) generated by passivation in a gas-phase passivation process; and the data analysis device further comprises a gas drying apparatus, a gas chromatograph, a metering machine, an air inlet monitoring valve and an air outlet monitoring valve. By the passivation system, waste gases are easy to treat, and the waste gases generated by gas-phase passivation can meet the discharge standard after being treated simply.

The invention discloses an environment-friendly composite color passivation solution and a preparation method thereof, and belongs to the technical field of surface treatment of metal materials. The passivation solution comprises the components of 5-8g/L of tannic acid, 4-8mL/L of titanium trichloride, 4-7mL/L of nitric acid, 15-20mL/L hydrogen peroxide, 2-5mL/ L concentrated sulfuric acid, 8-12mL/L of phosphoric acid, 2-7g/L of sodium silicate, 6-10g/L of potassium fluoride, 2-5mL/L of ascorbic acid, 4-7mL/L of aminotrimethylene fork phosphonic acid, and the balance water, and the pH value is1.5-2.0. A zinc plating coating passivation film treated by the passivation solution is bright in color, uniform in color and film thickness and excellent in corrosion resistance; and the passivationsolution has no trivalent chromium, hexavalent chromium and other harmful substances, environmental protection and no pollution are achieved, the passivation process is simple, the passivation efficiency is high, and corrosion resistance of the film is good.

The invention discloses recipe design for enabling an aluminum alloy spraying oil removal groove and chromate-free passivation groove chemical to be compatible. The recipe design thoroughly solves theproblems that a 1# oil removal groove and a 4# chromate-free passivation groove are not stable, fluorine-containing sludge is generated on the groove bottom easily, and toxic and dangerous waste needs to be cleared manually. Stable ingredients of groove liquid in a traditional oil removal groove and a chromate-free passivation groove are insufficient and are decomposed and deposited easily; and ingredients of oil removing liquid is brought into the 4# chromate-free passivation groove through a 3# water washing groove, and incompatibility is caused. By means of the design for enabling the ingredients of the 1# oil removing groove and the ingredients of the 4# chromate-free passivation groove to be compatible, the oil removing liquid does not consume chromate-free passivation groove chemical and can supplement ingredients, and the production cost is reduced. By means of addition of a corrosion inhibitor, a chelating agent and bonderite, and chelation with positive ions, generation of fluoride and hydroxide is eradicated, it is ensured that the groove liquid is not turbid or deposited, and aluminum alloy powder spraying chromate-free passivation pre-treatment stable production is achieved.

The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel electrolytic passivator, a preparation method and application thereof. The stainless steel electrolytic passivator is prepared from the following raw materials: sulfuric acid, manganese sulfate, a corrosion inhibitor, a wetting agent and water. Compared with an existing passivator,the stainless steel electrolytic passivator is more environment-friendly in components, faster in electrolytic passivation efficiency under the action of a specific current and thicker in passivationfilms on the surface of stainless steel after passivation, higher corrosion resistance requirements are met, and the service life of stainless steel products is prolonged.