407 results about "Corrositex" patented technology

A cost effective, two component, high-solids elastomeric coating. The coating is comprised of a chemically cross-linked resin for the purpose of substrate corrosion control, and chemical containment service. This invention may be applied by conventional application techniques including, but not limited to: brush applied, squeegee applied, roller applied, trowel applied, and both single and plural component spray applied. The coating may be optionally reinforced with fabric or fiber reinforcement layers, and the system components of the elastomeric coating to provide an engineered composite coating. The coating imparts excellent adhesive properties, in particular to: oil-contaminated substrates, a variety of low surface energy substrates, and on a variety of electronegative substrates. The invention's specific chemical resistive properties are designed such: for exposure to boiling water, resistance to brines, and resistance to a broad spectrum of solid and aqueous acids and caustics. The physical properties include excellent flexibility and the ability to elongate and contract across a broad temperature range (−100° F. to +260° F.). Performance properties of the installed coating include: weatherability, abrasion resistance, impact strength, chip resistance, and dimensional stability. Long-term aging properties of the material are exceptional.

A metallographic corrosion method for displaying a GCr15 original austenitic grain boundary comprises adding picric acid 5g into distilled water100ml and mixing continuously, then adding sodium dodecyl benzene sulfonate 5ml 50% and mixing, finally adding ferric chloride 2g, and using after placing for 24 hours. A sample is grinded roughly, grinded finely, polished, cleared, dried, immersed into caustic erodent for 2-5 minutes according to normal method under a quenching tempering condition until etched surface is changed into silver grey, cleaned up through flowing water, cleaned with alcohol 95%, and dried. If the sample is over-corroded, polishing paste W0.5-1.0 or metallographic polishing egent0.5-1.0 is added on silk polishing cloth, the sample is polished slightly with hands, then cleaned with alcohol 95%, and dried. According to practical condition, grain granularity measurement can adopt methods of picture contrast, grid, intercept, quantitative metallography, and the like, to assess according to relevant standards.

The invention relates to a metallographic corrosion method for clearly displaying the original austenite grain boundary of a NiCrMoV type rotor steel, and belongs to the field of metallographic sample preparation. The method comprises the steps of: coarse grinding, fine grinding, polishing and corroding; putting a polished sample into a corrosive liquid of 75 DEG C, wherein the formula of the corrosive liquid comprises 200ml of distilled water, 5g of picric acid, 2ml of 5% diluted hydrochloric acid and 4g of sodium dodecyl benzene sulfonate; etching for 2minutes, taking the sample out, cleaning the sample with flowing water, cleaning the sample with alcohol and drying; and observing the clear original austenite grain boundary through an optical microscope. The method has the advantages that a difficult displaying problem of the original austenite grains of the NiCrMoV type rotor steel is solved, the original austenite grain boundary can be very clearly displayed, and the method is simple and practicable.

The invention discloses a corrosive agent for displaying 9% Cr steel original austenite grain boundary and an application thereof. The corrosive agent is prepared by fully mixing the following components of: 60-80ml of H2O, 4-8ml of 36 wt% HCl, 2-4g of FeCl3, 0.2-0.5g of picric acid, and 1.0-2.0g of sodium dodecanesulphonate. The corrosive agent provided by the invention can be used as a reagent for 9% Cr steel grain boundary to clearly display the original austenite grain boundary of large crystal grain, large and small mixed crystal grain and small crystal grain of a sample. Under 100 times, it is easy to carry out grain size rating and the effect is good.

The invention discloses an organic modified hydrophobic nano silica hollow ball and a preparation method thereof. A microemulsion method is used to prepare an organic modified nano SiO2 solid ball precursor. Hydrochloric acid and other inorganic acid are used as corrosive agents. A chemical corrosion method is used to prepare a hollow nano silicon ball. A general formula OgHS can be used to express the hollow nano silicon ball, wherein Og is one or more of methyl, ethyl, propyl, vinyl, dodecyl, octyl, cetyl, naphthyl, phenyl, trifluoropropyl and pentafluorophenyl, and HS is Hollow Silica. The hollow ball has the characteristics of uniform cavity, large specific surface area, surface hydrophobization and the like, and has a broad application prospect in the aspects of drug slow-release, carrier catalysis, gas storage, pollution absorption and the like.

The present invention discloses a clean compounded ester type high-temperature chain oil and its preparation method. Its composition includes (by wt%) 40-90% of pentaerythritol compounded ester, 10-50% of benzenetetracarboxylic acid ester, 1-5% of high-temperature antioxidant, 1-5% of extreme pressure/anti-scuff agent and 0.02-0.5% of corrosion-resisting agent. Besides, said invention also provides the concrete steps of its preparation method, and provides its application range.

The invention provides high-stability magnetorheological polishing liquid for optical part processing. The high-stability magnetorheological polishing liquid consists of the following components in percentage by weight: 30-40 percent of magnetic particles, 1-3 percent of a wetting agent, 0.1-0.5 percent of a pH regulating agent, 0.1-0.5 percent of a corrosion inhibitor, 1-5 percent of a surface active agent, 0.1-1 percent of a thixotropic agent, 0.1-0.5 percent of a polishing powder and 50-60 percent of deionized water. A preparation method of the high-stability magnetorheological polishing liquid comprises the following steps: mixing and stirring the surface active agent and the deionized water in proportion for 0.5-1 hour; adding the thixotropic agent; sequentially adding the wetting agent and the corrosion inhibitor; adding the pH regulating agent to regulate the pH value to 10; then stirring the carbonyl iron powder and the polishing powder in proportion for 1 hour, adding obtainedinitial mixed magnetorheological polishing liquid in an emulsifying machine for stirring to obtain the high-stability magnetorheological polishing liquid for optical part processing. The high-stability magnetorheological polishing liquid for optical part processing, provided by the invention, is larger in magnetorheological liquid shear stress, good in re-dispersion performance and higher in material removal efficiency and can maintain long-term polishing stability on a machine tool, and the production process is simple and easy to implement, can be used for mass production and can also meetthe demands on ultra-precision machining of advanced optical parts.

The invention provides a dislocation identification method of a silicon carbide crystal. The method comprises the following steps: (1) corroding the silicon carbide crystal in an alkaline corrosive agent; and (2) after the corrosion is completed, observing the morphology of a dislocation corrosion pit so as to identify blade dislocation, screw dislocation and base plane dislocation in the siliconcarbide crystal, wherein the silicon carbide crystal comprises high-purity silicon carbide and nitrogen-doped silicon carbide, the corrosion time of the high-purity silicon carbide is 5-7 minutes, andthe corrosion time of the nitrogen-doped silicon carbide is 7-9 minutes. According to the method, the corrosion time of alkaline corrosion is optimized, and the corrosion time of high-purity siliconcarbide and nitrogen-doped silicon carbide is controlled to be less than 10 minutes so that three dislocations including edge dislocations, screw dislocations and base plane dislocations in the high-purity silicon carbide or the nitrogen-doped silicon carbide can be accurately distinguished; the corrosion time is short; and three dislocations in the crystal can be accurately identified.

The invention discloses a method capable of completely and clearly displaying the Austenite grain size of a wire rod for a prestressed steel stranded wire. The method is realized through the following steps of: preparing a test specimen to be tested: putting a 15cm-long wire rod in a muffle furnace at 860 DEG C plus or minus 10 DEG C for heating and then quenching and cooling the wire rod in cooling water at room temperature; tempering the wire rod for one hour in a furnace at approximately 200 DEG C; preparing corrosive agent: adding 6g of picric acid into 100ml of distilled water, continuously agitating, then adding five drops of cleanser essence, agitating, finally adding 3g of copper sulfate and placing for 12 hours; heating the corrosive agent to 60 DEG C, putting the test specimen to be tested in the corrosive agent to corrode the test specimen to be tested for 1.5 minutes, taking out the test specimen to be tested, repeating the corrosion and polishing steps for 3-5 times and finally conducting assessment through a comparison method against a standard map. The Austenite grain size testing method provided by the invention is a simple, convenient and high-efficiency 82B steel Austenite grain size testing method.

The invention provides a gasholder sealing oil composition with high corrosion resistance and oxidation resistance. The gasholder sealing oil composition comprises the following components in percentage by weight: 0.1 to 1.2 percent of antioxidant, 0.01 to 0.8 percent of dispersant, 0.05 to 1.0 percent of antioxidant and anti-corrosion agent, 0.01 to 1.0 percent of cleaning agent, 0.01 to 0.2 percent of demulsifier, 1 to 11 percent of viscosity index improver, 0.1 to 2 percent of pour point depressant and the balance of base oil. The gasholder sealing oil composition has excellent antioxidation stability, is suitable for various working conditions and has long service life; raw materials are reasonably mixed; and the preparation method has the advantages of simplicity, wide application range and readily available raw materials.

The invention belongs to the technical field of chemical industry, and particularly relates to an environment-friendly combustion-supporting diesel fuel additive and a preparation method thereof. Theenvironment-friendly combustion-supporting diesel fuel additive is prepared from the following raw materials in percentage by weight: 2 to 5 percent of cetane number improvers, 0.5 to 1.0 percent of ferrocene, 0.2 to 0.4 percent of rare earth metal salts, 1 to 3 percent of anti-corrosion agents, 5 to 15 percent of plant oil and the balance of aviation kerosene. The prepared environment-friendly combustion-supporting diesel fuel additive has the advantages that the preparation process is simple; the cost is low; the energy-saving environment-friendly diesel fuel additive has good cleaning and purification effects; the diesel fuel quality can be effectively improved; the hexadecane number of the diesel fuel is increased; the diesel fuel combustion efficiency is improved; the full combustionof the fuel is promoted; the oil consumption is reduced; the carbon deposit in an engine cylinder body is reduced; the engine dynamic property is improved; the discharging of harmful substances of theengine tail gas is reduced; the discharging of black smoke and particulate matters is obviously reduced; the diesel fuel is effectively saved; the tail gas exhaust is reduced; the tail gas exhaust pollution is reduced; the environment-friendly effect is promoted.

The present invention relates to the technical field of lubricating grease industry, especially to a vehicle brake branch pump guide pin lubricating grease and a preparation process thereof. The vehicle brake branch pump guide pin lubricating grease comprises, by weight, 50-70% of a base oil, 25-50% of a thickener, 0.5-3% of an antioxidant, 0.1-1% of an anti-corrosion agent, 1-5% of an extreme pressure anti-wear agent, and 0.3-1% of an anti-rust agent. The technical scheme of the present invention comprises the following steps: a, sequentially pouring base oil, antioxidant, an anti-corrosion agent, an extreme pressure anti-wear agent and an anti-rust agent into a reaction kettle to carry out stirring heating, and carrying out homogenization degassing to obtain the finished product. Compared with the vehicle brake branch pump guide pin lubricating grease in the prior art, the vehicle brake branch pump guide pin lubricating grease of the present invention has advantages of good water resistance, extremely low friction coefficient, effective noise reducing, good lubricity, good protection property, good thermal stability, high and low temperature property, colloidal stability, anti-oxidation, anti-corrosion stability and tightness.

The invention aims at providing a corrosive agent and corrosion method for a second phase of zirconium alloy. The corrosive agent is characterized by being prepared from hydrofluoric acid, nitric acidand water according to a certain proportion. By corroding the second phase in the zirconium alloy through the corrosive agent, the macroscopic distribution and the particle size of the second phase of the zirconium alloy can be clearly observed. According to the corrosive agent and corrosion method for the second phase of the zirconium alloy, the problem that a blank exists in research on the second phase of the zirconium alloy can be well solved, and work such as macroscopic distribution research and particle size statistics of the second phase of the zirconium alloy and research on the relation between the second phase of the zirconium alloy and a substrate become simple and efficient.

The invention relates to a metallographical corrosive for a medium entropy high-temperature alloy and a corrosion method and belongs to the technical field of metal functional materials. The corrosiveis prepared by mixing 5-10 g of copper sulfate, 15-30 ml of hydrochloric acid, 10-25 ml of water, 2-3 g of ferric chloride and 2-4 ml of nitric acid. The corrosion method comprises the following steps of putting a test sample in the corrosive for electrolytic corrosion, wherein a stainless steel plate is taken as a cathode, the test sample as an anode, the electrolytic voltage is 1.5-5 V, the electrolytic current is 0.1-0.3 A and electrolytic time is 20-60 s; and taking out the sample, cleaning the sample with alcohol, blow-drying the sample, and observing microstructures of the sample under a microscope. The corrosive has the advantages that microstructure and morphology of the medium entropy high-temperature alloy can be corroded relatively clearly, and the method is simple and feasible. The corrosive is suitable for displaying microstructure and morphology of the medium entropy high-temperature alloy with various components.

A waterless abrasive-free polishing solution for chemical-mechanical polishing of flexible, crisp and deliquescent crystals is characterized in that the solution comprises 0.5-40% of an organic corrosion agent, 0.5-20% of an organic corrosion inhibitor, 0.5-15% of an organic surfactant, 0.01-10% of an organic pH adjustment agent, and 30-95% of an organic solvent. The waterless abrasive-free polishing solution contains no water, so a problem of easy deliquescent cracking of the flexible, crisp and deliquescent crystals when meeting water is avoided. Simultaneously the waterless abrasive-free polishing solution which contains no abrasives has small damages to surfaces of the flexible, crisp and deliquescent crystals, allows the flexible, crisp and deliquescent crystals can have nondestructive and super-smooth surfaces to be obtained, does not precipitate, and can be preserved and used for a long time. The waterless abrasive-free polishing solution has the advantages of good stability, good fluidity, easy cleaning, and small corrosion to equipment. The waterless abrasive-free polishing solution prepared in the invention is specially used for the chemical-mechanical polishing of the flexible, crisp and deliquescent crystals, has the advantages of no water and no abrasives, and allows flexible, crisp and deliquescent materials to have high surface qualities, and the high surface quality obtaining method is simple, is easy to implement, and costs low.

The invention discloses metallographic corrosive liquid for a bimetal composite pipe with a transition layer, belonging to the technical field of detection of bimetal composite pipes. The corrosive liquid is prepared by adding ferric trichloride to a concentrated hydrochloric acid ethanol solution with the volume ratio of 35-60 percent, wherein the ferric trichloride addition amount is 0.01-0.04g/ml. The corroding method comprises the following steps of: completely immersing a polished sample to the corrosive liquid, and maintaining for 0.3-2Min. The invention provides the corrosive liquid which is suitable for daily metallographic inspection, low in cost and free of pollution and a corroding method of the corrosive liquid aiming at a metallic stainless steel and low alloy steel composite pipe which is produced by adopting a metallurgical bonding process and is provided with a wide transition layer at a bonding surface between stainless steel and low alloy steel. The corrosive liquid and the corroding method disclosed by the invention can be used for simultaneously corroding metallic tissues from the stainless steel, the low alloy steel and the wide transition layer for the purpose of detection.

The invention relates to a corrosive agent for displaying the austenite grain boundary of martensitic stainless steel and a display method. The corrosive agent comprises potassium permanganate, concentrated sulfuric acid and water, and the dosage ratio of potassium permanganate to concentrated sulfuric acid to water is (0.5-2) g: (5-15) mL: (85-95) mL; the display method comprises the steps of metallographic sample preparation, sample ultrasonic corrosion, sample observation and grain size statistics. Compared with the prior art, the corrosive agent provided by the invention requires few typesof chemicals, has the advantages of safety, no toxicity, convenience in operation, good display effect and the like, can clearly display the original austenite grains of the martensitic stainless steel sample, solves the problem that the austenite grain boundary of the martensitic stainless steel is difficult to corrode, and is suitable for displaying various low-carbon high-alloy martensitic steel original austenite boundaries which are difficult to corrode, the sample grain boundary corrosion success rate is high, the corrosive agent and the corrosion method are safe and convenient, material grain grading in the actual production process is effectively assisted, and a basis is provided for optimization of the heat treatment process.

The embodiment of the invention provides a nickel-saving austenitic stainless steel metallographic display method. A nickel-saving austenitic stainless steel sample is roughly ground, finely ground, polished, cleaned and blow-dried to prepare a metallographic sample; the prepared metallographic sample is used as an anode, and is fixed by a tweezer camp with the galvanized surface layer to be led out and connected to the positive pole of a direct-current voltage-stabilized power supply; an aluminum plate is used as a cathode and lead out to be connected to the negative pole of the direct-current voltage-stabilized power supply, the metallographic sample and the aluminum plate are kept parallel, the metallographic sample is polished to face the aluminum plate, an etchant is used as a conductive solution, the anode and the cathode are immersed in the etchant, and a wire immersed in the etchant is a metal material; the power supply is powered on, the voltage is controlled to be 20-30V, time is controlled to be 40-60s, and corrosion is finished when the corrosion surface of the metallographic sample silver gray; and the power supply is powered off, the metallographic sample is taken down, washed by distilled water, sprayed by alcohol and blow-dried, and finally a metallographic microscope is used for observation to obtain a nickel-saving austenitic stainless steel structure.

The invention provides a corrosive agent for a CdGeAs2 crystal, which is prepared from hydrochloric acid, nitric acid and pure water, wherein the volume ratio of the hydrochloric acid to the nitric acid to the pure water is 1 to 1 to 1, the mass concentration of the hydrochloric acid is between 35 and 38 percent, and the mass concentration of the nitric acid is between 65 and 68 percent. A CdGeAs2 crystal corrosion method utilizing the corrosive agent orderly comprises the following processing: (1) a step of corrosion, in which a CdGeAs2 crystal wafer is subjected to grinding and polishing and is immersed in the corrosive agent, is corroded by swinging at normal pressure and at a temperature of between 15 and 30 DEG C for 15 to 40 seconds and is taken out; (2) a step of washing, in which the CdGeAs2 crystal wafer taken out of the corrosive agent is immersed in an alkaline cleaner to stop the corrosive reaction, and is washed to be neutral by pure water; and (3) a step of drying, in which the washed CdGeAs2 crystal wafer is naturally dried or oven-dried at the normal pressure.

This invention provides a liquid composition that removes titanium nitride from a substrate without corroding tungsten or a low-k interlayer dielectric also present on said substrate. Said liquid composition has a pH between 0 and 4, inclusive, and contains the following: at least one oxidizing agent (A) selected from the group consisting of potassium permanganate, ammonium peroxodisulfate, potassium peroxodisulfate, and sodium peroxodisulfate; a fluorine compound (B); and a tungsten-corrosion preventer (C). The tungsten-corrosion preventer (C) either contains at least two different compounds selected from a group of compounds (C1) consisting of alkylamines, salts thereof, fluoroalkylamines, salts thereof, and the like or contains at least one compound selected from said group of compounds (C1) and at least one compound selected from a group of compounds (C2) consisting of polyoxyalkylene alkylamines, polyoxyalkylene fluoroalkylamines, and the like. The mass concentration of potassium permanganate in the abovementioned oxidizing agent (A) is between 0.001% and 0.1%, inclusive, and the mass concentration of the abovementioned fluorine compound (B) is between 0.01% and 1%, inclusive.

The invention relates to a metallographic detection method for rotor steel weld joint residual austenite. The used corrosive agents are divided into two corrosive agents; the formula of the corrosive agent 1# contains 100 ml of distilled water, 4 g of picric acid and 5 ml of diluted hydrochloric acid with volume fraction of 5 percent; the formula of the corrosive agent 2 contains 100 ml of distilled water, 10 g of pyrosulfurous acid and 5-6 drops of hydrochloric acid solution with volume fraction of 5 percent. The used corrosion process is divided into two steps: step one, a polished sample is immersed in the prepared corrosive agent 1# and a face to be corroded is kept vertically downward and is slightly oscillated to etch for 1.5 min; step two, the sample is cleaned, blow-dried and immersed in the prepared corrosive agent 2#, and a face to be corroded is kept vertically downward to etch for 10 min. White spots observed under a metallographic microscope are residual austenite, and the content of the residual austenite can be tested by introducing a metallograph of a proper multiple into Image-ProPlus software. The method can be used for comprehensive analysis of the size, the shape, the distribution and the content of the residual austenite in a rotor steel weld joint, and is simple and feasible in technical implementation.

The invention relates to the technical field of metallographic corrosion, in particular to a metallographic corrosive agent of a high-strength titanium alloy and a preparation method of the high-strength titanium alloy metallographic sample. The metallographic corrosive agent is prepared from the following components in parts by volume of 4-5 parts of hydrofluoric acid, 12-14 parts of concentratednitric acid, 5-8 parts of dilute hydrochloric acid, 0.24-0.4 parts of hydrogen peroxide and 60 parts of water. Fluorine ions, nitrate ions and chloride ions in dilute hydrochloric acid, concentratednitric acid and hydrofluoric acid in the metallographic corrosive agent can be rapidly and stably combined with alloy metal ions with ultrahigh negative potential in a titanium alloy sample, so that concave grooves are corroded at the grain boundary, and the metallographic structure can appear at a stable and relatively high speed; hydrogen peroxide can play a role in delaying the corrosion speedof the metal and improve the controllability of the corrosion; and the relatively good metallographic sample can be conveniently and quickly prepared. Moreover, the metallographic corrosive agent is environmentally friendly, low in cost, safe and high in corrosion-resistant metallographic success rate.

The invention belongs to metallographic corrosion technologies, and relates to a metallographic corrosive agent and method for nickel-vanadium alloy. The metallographic corrosive agent for the nickel-vanadium alloy comprises, by volume, 10-15% of hydrogen peroxide of 30-50 wt%, 10-15% of nitric acid of 65-68 wt%, and 70-80% of hydrochloric acid of 36-38 wt%. The metallographic corrosive method includes the steps of blending, heating, soaking, washing, wiping, drying and the like. By means of the metallographic corrosive agent and method, crystalline phases in the nickel-vanadium alloy can be easily distinguished, and the quality of nickel-vanadium alloy products can be easily evaluated. Moreover, the metallographic corrosive agent for the nickel-vanadium alloy can prevent a pollution layer from being formed on the surface of a sample, and prevent the crystalline phases in the nickel-vanadium alloy from being badly corroded. Meanwhile, the corrosive liquid can corrode out the metallographic structure of the sample rapidly and efficiently.