148 results about "Chromic acid" patented technology

A solid electrolyte includes: LiaAbEc(SO4)dJeXfHh, A is selected from alkaline earth metals and alkali metals other than Li, E is selected from Al, Ga, In, Sc, Y, Ti, Zr, Hf, and lanthanides, J is selected from OH, BO2, BO3, BO4, B3O6, B4O7, CO3, NO3, AlO2, SiO3, SiO4, Si2O7, Si3O9, Si4O11, Si6O18, PO3, PO4, P2O7, P3O10, SO3, SO5, S2O3, S2O4, S2O5, S2O6, S2O7, S2O8, BF4, PF6, BOB, (COO)2, N, AlCl4, CF3SO3, CH3COO, CF3COO, OOC—(CH2)2—COO, OOC—CH2—COO, OOC—CH(OH)—CH(OH)—COO, OOC—CH(OH)—CH2—COO, C6H5SO3, OOC—CH═CH—COO, OOC—CH═CH—COO, C(OH)(CH2COOH)2COO, AsO4, BiO4, CrO4, MnO4, PtF6, PtCl6, PtBr6, PtI6, SbO4, SeO4, TeO4, HCOO, and O, X is selected from F, Cl, Br, and I, 0.5≤a<6, 0≤b<6,0<c<2,0.1<d≤6.0, 0<e≤6.0, 0<f≤6.1, and 0≤h≤0.2, and a peak is observed at a diffraction angle 2θ=22.3°±1.0° in an X-ray diffraction pattern in which Cu-Kα is used as a line source.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The present invention provides a method for producing a molybdenum-vanadium-aluminum-chromium alloy with high uniformity. The composition of the molybdenum-vanadium-aluminum-chromium alloy is as follows: Mo 25% - 28%, V 24% - 27%, Cr 28% - 31%, with the balance being Al, O ≤ 0.05%, C ≤ 0.05%, and the segregation of the main content being < 0.6%. It relates to the field of metallurgical technology. The technological steps are as follows: (1) Prepare an ammonium molybdate-ammonium dichromate-ammonium metavanadate precursor by hydrothermal method using sodium molybdate, sodium metavanadate, sodium dichromate, and ammonium chloride; (2) Perform high-temperature treatment on the precursor to obtain a MoO3 / V2O5 / CrO3 composite material; (3) Mix the MoO3 / V2O5 / CrO3 composite material, refined aluminum powder, and calcium oxide in proportion, load them into a furnace and ignite to undergo a thermite reaction to obtain a molybdenum-vanadium-aluminum-chromium alloy ingot. Compared with the molybdenum-vanadium-aluminum-chromium alloy produced by the traditional thermite method, the uniformity of the present invention is greatly improved, and it can be used for the production of titanium alloys such as TB2, TB9, TB15, and TB16.

The invention provides a method for detecting dichromate radicals based on surface enhanced Raman spectroscopy, and belongs to the technical field of analytical chemistry. Comprising the following steps: mixing a to-be-detected sample with a sulfydryl-containing compound solution, and adjusting to an acidic condition, so that dichromate Cr (VI) and the sulfydryl-containing compound are subjected to an oxidation-reduction reaction; constructing an SERS substrate, namely preparing a ZnO / Ag heterostructure substrate; mixing the suspension of the ZnO / Ag heterostructure substrate with a reaction system to obtain a mixed solution, so that the ZnO / Ag heterostructure substrate adsorbs a sulfydryl-containing compound and enhances a Raman signal; dropwise adding the mixed solution to the surface of a solid carrier, acquiring a Raman spectrum signal by using a Raman spectrometer, and quantifying the Cr (VI) concentration through the change of signal intensity. The method realizes rapid and high-sensitivity detection of Cr (VI), has strong selectivity and anti-interference capability, and is suitable for detection in the fields of environmental monitoring, food safety, pharmaceutical analysis and the like.

The invention discloses a fully automatic chemical oxygen demand analyzer based on a dichromate method, comprising: a digestion module, a condensation module, a lower liquid addition module, an upper liquid addition module, a stirring module and a titration module, which automatically realizes the digestion, condensation, liquid addition, stirring and titration of a sample. The fully automatic chemical oxygen demand analyzer based on a dichromate method provided by the invention realizes the fully automatic detection of CODCr, and the detection conditions are stable and the applicability is strong.

The invention belongs to the technical field of precision part machining, and discloses a precision part corrosion-resistant coating process, electrochemical treatment is chromic acid treatment, coating materials comprise epoxy resin coating, polyurethane coating and polytetrafluoroethylene coating, and a spraying technology comprises electrostatic spraying, air spraying and airless spraying. Hydrochloric acid is used for removing oxides on the surface of steel, phosphoric acid is used for removing rust on the surface of metal, through cooperation of acid pickling, passivation and electroplating, acid pickling and passivation can remove the surface oxides, the hardness and friction resistance of the surface of the metal can be improved, and electroplating can improve the surface hardness of parts, improve abrasion resistance and prevent corrosion; a protective film is formed through passivation treatment, further oxidation is prevented, chromate passivation soaking time is 10-30 minutes, phosphate passivation soaking time is 5-15 minutes, nitric acid passivation soaking time is 5-10 minutes, and durability, corrosion resistance and surface hardness of the precision part are improved.

The invention discloses a surface treatment method of a copper foil, an antioxidant copper foil and a negative electrode of a lithium battery. The anti-oxidation copper foil comprises a copper foil base material and an anti-oxidation layer formed on the copper foil base material. The anti-oxidation layer has a chromium element and is derived from a chromic acid compound, and the anti-oxidation layer has a nitrogen element which is at least partially derived from an aminotetrazole compound and a nitrogen-containing heterocyclic compound. The anti-oxidation copper foil has the following characteristics: (a) the chromium content of the anti-oxidation layer measured by XRF (X-Ray Fluorescence) is 5-35 [mu] g / m < 2 >; (b) the nitrogen content of the anti-oxidation layer measured by XPS is 0.1-10% by mass; (c) analyzing the antioxidant copper foil by headspace-MS (Mass Spectrometry) to determine a C-N signal; and (d) the color difference [Delta] E of the antioxidant copper foil baked at 250 DEG C for 10 minutes is not more than 8. Therefore, the antioxidant copper foil disclosed by the invention has more outstanding heat resistance, so that the antioxidant copper foil is more suitable for being used as a negative electrode material of a lithium battery.

The invention discloses an ultrahigh-burning-speed double-layer ignition sheet in the technical field of thermal batteries, and the ultrahigh-burning-speed double-layer ignition sheet is prepared by the following steps: step 1, slurry preparation: using distilled water to immerse loose asbestos paper until the loose asbestos paper is soft, then crushing the loose asbestos paper, adding zirconium powder, and uniformly mixing to obtain a zirconium powder paper pulp solution; respectively adding barium chloride and potassium chromate into the zirconium powder paper pulp solution in a stirring state to obtain a turbid liquid containing the loose asbestos, the zirconium powder and the barium chromate, performing suction filtration to obtain a mixture containing the barium chromate, the zirconium powder and the loose asbestos, dispersing the mixture in an adhesive, and uniformly stirring to obtain slurry; wherein the mass ratio of the loose asbestos to the barium chloride to the zirconium powder to the potassium chromate is (1-10): (35-45): (15-20): (25-35); and secondly, the slurry prepared in the first step is sprayed on an ultra-high-burning-rate Al-Ni film, drying is conducted for 1.5-2.5 h under the condition of 120-180 DEG C in argon shielding gas, and the ultra-high-burning-rate double-layer ignition sheet is obtained. Compared with the prior art, the ultrahigh-burning-speed double-layer ignition sheet prepared by the invention is higher in burning speed.

The invention relates to the technical field of getters, and discloses a getter for a vacuum insulated panel and a preparation method of the getter. The getter for the vacuum insulated panel comprises the following components in percentage by mass: 55-65% of calcium oxide, 12-18% of activated aluminum oxide, 6-8% of manganese dioxide, 4-6% of copper oxide, 3-5% of yttrium oxide, 5-7% of zirconium dioxide and 1-2% of chromium powder. The preparation method of the getter comprises the following steps: S100, carrying out ball milling treatment on calcium oxide, activated aluminum oxide, manganese dioxide, copper oxide, yttrium oxide, zirconium dioxide and chromium powder to obtain powder, and drying the powder; s200, mixing the dried powder with deionized water and polyvinyl alcohol, and drying to prepare porous spherical particles; s300, after gradient sintering is conducted on the porous spherical particles, rapid cooling is conducted, and particles of a multi-stage pore channel structure are obtained; and S400, dipping the particles with the hierarchical porous structure in a chromic acid solution, and drying to obtain the getter. According to the technical scheme, the technical problems of low efficiency and insufficient adsorption capacity of a getter in the prior art are solved.

A method of selectively metallizing a multi-component molded plastic part. The multi-component molded plastic part comprises at least one first region to be metallized formed of a first plastic and at least one second region that is not to be metallized formed of a second plastic. The method includes the steps of (a) contacting the multi-component molded plastic part with a chromic acid-free etchant, wherein the chromic acid-free etchant comprises manganese sulfate; (b) optionally, neutralizing the manganese sulfate to Mn2+ ions; (c) activating surfaces of the plastic part with an activator; (d) contacting the activated surfaces of the plastic part with an accelerator; and (e) depositing an electroless plating layer on the surfaces of the multi-component molded plastic part with an electroless plating electrolyte comprising nickel and copper to form an electroless copper-nickel layer on substantially only the first region formed of the first plastic.

The present invention discloses a multifunctional ionic porous organic cage material, its preparation method and chromium adsorption application, belonging to the technical field of porous organic materials. In the present invention, a porous organic cage material NKPOC-PH is synthesized using tetraaldehyde m-cyclocucurbit[4]arene and pyridine-3,5-dicarboxylic dihydrazide as reaction monomers, and then it is modified with methyl iodide to obtain ionic NKPOC-PH(I)Me. The present invention uses an easily modified porous organic cage as the substrate to construct triple synergistic adsorption sites of redox, coordination and electrostatics. Pyridine groups in the material are used as the introduction points of electrostatic sites, hydrazide linking groups as redox sites, and nitrogen-rich sites to adsorb dichromate ions through coordination. The obtained ionic porous cage can achieve an ultra-high chromium adsorption performance with a saturated adsorption capacity exceeding 1.3 g / g under acidic (pH = 3-4) aqueous phase conditions. The ionic porous organic cage material described in the present invention provides a new solution for adsorbing dichromate ions under aqueous phase conditions.

The present invention provides a heat exchanger capable of stably and continuously recovering heat over a long period of time, even when the target gas for heat recovery is an extremely corrosive gas, and an exhaust gas treatment device using such a heat exchanger. [Solution] The heat exchanger of the present invention is characterized by comprising a partition plate (14) made of refractory castable material that divides the inside of the casing (12) so that the low-temperature side fluid (LF) and the high-temperature side fluid (HF) flow in countercurrents, and a plurality of solid heat transfer rods (16) made of at least one ceramic selected from the group consisting of alumina, zirconia, silicon carbide, silicon nitride, molybdenum silicide, and lanthanum chromite, which are arranged to airtightly penetrate the front and back surfaces of the partition plate (14) and cross the flow paths of the low-temperature side fluid (LF) and the high-temperature side fluid (HF).

The present invention relates to the field of C23F technology, and more specifically, to a non-phosphating polishing liquid for aluminum alloy, a preparation method and a polishing process thereof. The non-phosphating polishing liquid for aluminum alloy comprises, by weight, 20-40 parts of sulfuric acid, 0.01-0.1 parts of sulfate, 1-5 parts of organic acid salt, and 0.05-0.1 parts of surfactant. The present application adopts the theory of chemical polishing mucosal layer, and abandons toxic and harmful components under the condition of meeting the appearance requirements of customers for gloss, flow marks, roughness, etc., and adopts chemical components without chromic acid, phosphoric acid, and nitric acid to develop an aluminum alloy chemical polishing liquid, which has good environmental protection, good stability, and can maintain good polishing performance for a long time. In addition, the LC4 workpiece obtained by using the polishing liquid is not only free of scratches, lines, orange peel, matte and other problems, but also has a neat surface of the workpiece and good bright effect.

The invention provides a method and a system for recovering chromium and aluminum from a waste chromium catalyst. The method comprises the following steps: carrying out alkali fusion reaction on the waste chromium catalyst and sodium hydroxide to obtain alkali fusion clinker; mixing the alkali fusion clinker with water, pulping, leaching, and carrying out solid-liquid separation to obtain a water leaching solution containing Na2CrO4 and NaAlO2 and a filter cake containing Al2O3; adding a barium salt solution or solid into the aqueous extract containing Na2CrO4 and NaAlO2, reacting to generate a BaCrO4 precipitate, and carrying out solid-liquid separation to obtain a BaCrO4 filter cake and a sodium metaaluminate filtrate; reacting the BaCrO4 filter cake with an inorganic acid, and carrying out solid-liquid separation to obtain a chromic acid solution and a barium sulfate precipitate; and adding an acid solution into the sodium metaaluminate filtrate, adjusting the pH value to 7-8, and carrying out solid-liquid separation to obtain an Al (OH) 3 filter cake. According to the method, Cr (III) in the waste catalyst is directionally converted into Cr (VI) through an alkali fusion oxidation process, then the solubility difference of sodium chromate and sodium metaaluminate in an aqueous solution is fully utilized, the high-selectivity separation characteristic of barium chromate precipitation is combined, the chromium-aluminum separation problem is fundamentally solved, and the finally obtained product is excellent in purity.

The application discloses a high-strength steel unqualified zinc-cadmium alloy plating layer stripping method, and its stripping process is as follows: 80-150 g / L of sodium nitrite, 50-100 g / L of ammonium bicarbonate, 50-100 g / L of ammonium chloride, the pH of the stripping solution is 6-8, and normal temperature operation is adopted. The sodium nitrite is used as an oxidizing agent and a steel base inhibitor for the zinc-cadmium alloy plating layer, the ammonium bicarbonate is used as a complexing agent for zinc ions and cadmium ions and a pH buffer for the plating solution, and the ammonium chloride is used as a complexing agent for zinc ions and cadmium ions and a promoter for dissolving the zinc-cadmium alloy plating layer. When the pH of the stripping solution is too high, dilute nitric acid is used to reduce the pH, and when the pH is too low, sodium carbonate solution is used to increase the pH. The technical scheme of the application is used to replace the chromium acid stripping method, and the high pollution problem caused by the use of the chromium acid is overcome.

The present disclosure relates to a coating, comprising a phosphate salt, a colloidal silica and a chromic acid compound, wherein the phosphate salt comprises magnesium dihydrogen phosphate and aluminum dihydrogen phosphate, and wherein a molar ratio of element Al to element Mg in the phosphate salt is 0.02 to 0.15. The present disclosure also relates to a grain-oriented silicon steel sheet, comprising: a substrate; and a coating layer on a surface of the substrate, wherein the coating layer is formed from the coating according to the present disclosure. The present disclosure further relates to a method for manufacturing a grain-oriented silicon steel sheet, comprising the steps of: applying the coating onto the surface of the substrate, and then performing a sintering treatment, wherein the substrate has a temperature, at which the sintering treatment is performed, of 800 to 880° C. The coating layer formed from the coating according to the present disclosure can impart higher tension and more excellent heat resistance to the grain-oriented silicon steel sheet, and has good promotion prospects and application effects.

The invention discloses an alloy material resistant to chloride molten salt corrosion and a preparation method and application thereof. The alloy material resistant to chloride molten salt corrosion comprises a chromium-containing alloy material matrix and a magnesium chromite-containing protective layer covering the surface of the chromium-containing alloy material matrix. The preparation method comprises the following steps: 1) mixing lithium carbonate-sodium carbonate-potassium carbonate molten salt and a magnesium source to prepare a mixture; and 2) covering the surface of a chromium-containing alloy material matrix with the mixture to carry out oxidation reaction, and then washing and drying. The surface of the alloy material is covered with the protection layer containing magnesium chromite, the preparation process of the protection layer is simple, the stability of the protection layer in a high-temperature chloride molten salt environment is good, and corrosive impurities in chloride molten salt can be effectively prevented from making contact with an alloy matrix; the corrosion of the chloride molten salt on key components such as a storage tank and a heat exchanger in the CSP system under a high-temperature condition is avoided, and the efficient, stable and safe operation of the CSP system is ensured.

To provide a pretreatment cleaning agent for electroless plating and a method for forming electroless plating using the same that eliminate the need of surface roughening to a substrate with a strong acid such as a chromic acid or permanganic acid, can perform cleaning of the surface of a substrate and coupling treatment at the same time, and can form metal plating having a flat contact surface to a substrate.SOLUTION: A pretreatment cleaning agent for electroless plating includes an inorganic alkali, a cleaning agent including a surfactant, and a silane coupling agent and can perform cleaning of the surface of a substrate and coupling treatment at the same time.SELECTED DRAWING: Figure 1

The invention relates to the technical field of biomedical detection and functional organic fluorescent materials, in particular to synthesis and application of a single-molecule probe combining BODIPY (boron dipyrromethene) and a semi-cyano dye. Comprising the following steps: preparing an intermediate 1: reacting 4-hydroxybenzaldehyde with 2, 4-dimethyl pyrrole to generate BDP-OMe, and then reacting with pyridinium chlorochromate to obtain the intermediate 1; preparation of an intermediate 2: carrying out reflux reaction on 2, 3, 3-trimethyl-3H-indole and 2-bromoethanol in ethanol to obtain the intermediate 2; and synthesizing a final product: heating the intermediate 1 and the intermediate 2 in toluene to react, and performing post-treatment and column chromatography purification to obtain the probe CyB-C. The bimodal detection capability enables the probe to simultaneously distinguish the microenvironment difference between normal cells and cancer cells and monitor diseases related to viscosity abnormity.

A thermoplastic composition is described. A thermoplastic composition may include (a) a copolymer having units derived from a vinyl aromatic monomer and a vinyl nitrile monomer; (b) a rubber-modified thermoplastic polymer; (c) a polar polymer comprising a carboxylic acid, an alcohol, or a combination thereof; and (d) optionally, a processing additive. A metal-plated article comprising the thermoplastic polymer composition is also described. The thermoplastic composition may have an improved yellowness index (YI) compared to similar compositions that do not contain the polar polymer.

The invention discloses a recovery method of a catalyst containing platinum, silver, chromium, vanadium, molybdenum and aluminum, which comprises the following steps: uniformly mixing a waste catalyst, caustic alkali and iron powder, reacting at high temperature, cooling to obtain a melt, dissolving the melt, and filtering to obtain a first filter residue and a first filtrate; dissolving the first filter residue with nitric acid, and filtering to obtain platinum-containing waste filter residue and second filtrate; adding a sodium chloride solution into the second filtrate, and filtering to obtain silver chloride filter residues and third filtrate which contains chromic nitrate; adding a barium chloride solution into the third filtrate, reacting at room temperature, and filtering to obtain barium chromate solid filter residues and fourth filtrate; adjusting the pH value of the first filtrate to 7-8 by using an acid, reacting at room temperature, and filtering to obtain activated aluminum oxide filter residues and a fifth filtrate; adding ammonium chloride into the fifth filtrate, reacting at room temperature, and filtering to obtain ammonium vanadate filter residues and sixth filtrate; and adjusting the pH value of the sixth filtrate to be less than 1 by using sulfuric acid, reacting at room temperature, and filtering to obtain molybdic acid filter residues and a seventh filtrate.

The valve comprises a valve body, a convex ring is arranged outside the valve body, the part, located at the bottom of the convex ring, of the valve body is wedge-shaped, a plurality of L-shaped locking blocks are arranged on the convex ring, one side of each locking block is in sliding connection with the convex ring, a magnetizer is fixed to the other side of each locking block, and the magnetizers and the locking blocks form a U-shaped structure. The valve electroplating process comprises the following steps: step 1, immersing a product into a cleaning furnace in which a deoiling agent is mixed with water, and leaching with clear water; 2, immersing in a nitric acid solution, and leaching with clear water; step 3, immersing into a cyanogen copper cylinder containing cuprous cyanide, sodium cyanide and potassium sodium tartrate, and rinsing with clear water; step 4, immersing into an acid copper cylinder containing copper sulfate, sulfuric acid and chloride ions, and rinsing with clear water; step 5, immersing into a bright nickel cylinder containing nickel sulfate, nickel chloride and boric acid, and rinsing with clear water; step 6, immersing in a cylinder containing chromic acid and chromium sulfate, and rinsing with clear water; and 7, the electroplating quality is inspected. The valve has the beneficial effect that the surface of the valve is not easy to corrode and rust.

The invention provides oleanolic acid, and a preparation method of the oleanolic acid comprises the following steps: S1, dissolving 5g of arginic acid in 500ml of dichloromethane, adding 7g of pyridinium dichlorochromate, stirring at room temperature for 18 hours, and detecting the reaction degree by thin-layer chromatography; s2, after the reaction is completed and vacuum concentration is carried out, a sample is mixed with 200-300-mesh silica gel, the mixture is volatilized to be dry and then placed on a silica gel column, column chromatography separation is carried out, petroleum ether / ethyl acetate is selected as a mobile phase, 2.87 g of oleanolic acid is obtained, the molecular formula is C30H46O3, and the yield is 57.6%. The oleanolic acid provided by the invention can be used for preparing medicines for treating oligospermia and medicines for improving dyszoospermia. The oleanolic acid provided by the invention is a natural product or an artificially synthesized product, is low in toxicity and small in side effect, and has good effects of improving dyszoospermia and promoting fertility.

An acidic treatment liquid processing apparatus includes: a tank having an interior space; a diaphragm permeable to a metal cation and separating the interior space of the tank into a first chamber and a second chamber; a first electrode disposed in the first chamber; a second electrode disposed in the second chamber; a power supply configured to apply a voltage while using the first electrode as an anode and the second electrode as a cathode; a first liquid passing part configured to pass an acidic treatment liquid containing a dichromate ion and a metal cation into the first chamber; and a second liquid passing part configured to pass an acid aqueous solution into the second chamber.

The utility model discloses chromic acid recycling evaporation concentration equipment which comprises a tank body, the top of the tank body is fixedly connected with a detection meter, the front side of the tank body is fixedly communicated with a flange base, the front side of the flange base is rotatably connected with a turning cover through a rotating shaft, the bottom of the tank body is fixedly communicated with a discharging pipe, and the bottom of the tank body is fixedly communicated with a discharging pipe. The top of the discharging pipe is fixedly connected with a valve, and the top of the tank body is fixedly connected with a motor. By arranging the tank body, the detection meter, the flange base, the turning cover, the discharging pipe, the valve, the motor, the cleaning device, a threaded rod, a storage ring, a connecting block, a support, a cavity, a telescopic assembly, an electric cylinder, an extension arm, a cleaning wheel, a water injection assembly, a ring pipe, a supporting frame, a water outlet pipe, a water injection pipe and a control valve which are used in cooperation, the problem that the chromic acid solution is prone to damage due to the fact that the viscosity of the chromic acid solution is large is solved. And deposition and blockage in the equipment are easily caused, so that secondary corrosion or damage to the equipment is caused.

The invention discloses a preparation method of a lead chromate photo-anode catalyst rich in oxygen vacancies. The method comprises the following steps: by taking Pb (NO3) 2 and Cr (NO3) 3 as raw materials, urea as a surfactant and 2-methoxyethanol as a solvent, carrying out ultrasonic treatment to uniformly mix the raw materials to obtain a precursor solution, and then repeatedly spin-coating and annealing on FTO (Fluorine-doped Tin Oxide) to prepare the lead chromate photo-anode catalyst rich in oxygen vacancies. The preparation method is low in cost, simple and controllable in process and good in repeatability, the obtained product is uniform and compact, the photocurrent density of the product is as high as 1.7 mA / cm < 2 >, and rich oxygen vacancies can effectively increase the carrier concentration and promote separation and transmission of photogenerated charges, so that the photoelectrochemical water decomposition performance is improved.

The invention discloses a carbon dot corrosion inhibitor with excellent corrosion inhibition and tracing performance, a preparation method and application, and relates to the technical field of corrosion inhibition of metal materials. The technical problems that in the prior art, a carbon dot corrosion inhibitor is prone to aggregation and instability in a high-temperature and strong-acid environment, and application is single are solved. The method comprises the following steps: firstly, taking citric acid and propargyl-PEG2-amine as raw materials, and dissolving the raw materials in deionized water to obtain a mixed solution; the mixed solution is placed in a high-pressure reaction kettle to be subjected to a hydrothermal reaction, and citric acid carbon dots modified by propargyl-PEG2-amine are prepared; sequentially carrying out centrifugation, dialysis and freeze drying treatment on the citric acid carbon dots modified by the propargyl-PEG2-amine, so as to obtain the citric acid carbon dots modified by the propargyl-PEG2-amine. The prepared carbon dot corrosion inhibitor can be used as a corrosion inhibition material in a high-temperature-resistant strong-acid environment, and can also be used for in-situ monitoring of dichromate ions in industrial wastewater and in-situ monitoring of iron ions and ferrous ions in underground water, surface water and drinking water so as to judge whether the content of the iron ions and the ferrous ions exceeds the standard or not.

The invention discloses a preparation method of a chromic acid anodized film layer for resisting a damp-heat test, which comprises the following steps: (1) carrying out chromic acid anodizing treatment on an aluminum alloy part, and controlling the technological parameters as follows: the voltage is 45-50V, the time is 53-58 minutes, and the thickness of the film layer reaches 4-5 microns; and (2) the part subjected to chromic acid anodizing is clamped in a suspension mode in a damp-heat test, and direct contact between the part and a contact surface is avoided. The two parameters of voltage and time required in the chromic acid anodizing process are controlled through a control variable method, the optimal chromic acid anodizing parameter is explored, and a chromic acid anodizing film layer meeting the requirement of a damp-heat test is achieved. The optimal clamping mode is obtained by further changing the clamping mode of the part in the damp heat test process.

The invention relates to the technical field of hazardous waste disposal and utilization, in particular to a technological method for co-disposal of chromic anhydride waste and waste zinc phosphide, which comprises the following steps: dissolving chromic anhydride waste in a dissolving tank according to a certain solid-to-liquid ratio, and hydrolyzing chromic anhydride to generate chromic acid; the method comprises the following steps: adding a certain proportion of an inorganic acid solution into a chromic acid solution, and combining chromate ions with hydrogen ions to generate dichromate ions under an acidic condition; transferring the solution into a closed first-stage reactor, and slowly stirring; according to the method, firstly, the method is suitable for chromic anhydride waste and zinc phosphide waste, waste chromate, dichromate waste and aluminum phosphide waste can be used, harmless treatment of the hazardous waste can be completed, secondly, reagents used in the treatment process only need phosphoric acid, hydrogen peroxide and sodium hydroxide, ferrous sulfate is not used as a reducing agent, and the method is environmentally friendly. The production of a large amount of iron mud is avoided, and finally, the produced secondary waste can be recycled, so that the aim of turning waste into wealth is fulfilled.

The invention relates to a chromic acid recovery device and a control method thereof, and belongs to the technical field of alkali corrosion machine auxiliary equipment.The chromic acid recovery device comprises a floor plate, a corrosion machine is arranged at the upper end of the floor plate, a chromic acid recovery tank is arranged below the floor plate, and a chromic acid recovery pipe is arranged between the lower portion of the corrosion machine and the upper end of the chromic acid recovery tank; a recovery host is arranged at the lower end of the chromic acid recovery tank, and a liquid level sensor communicated with the recovery host through a circuit is arranged on the corrosion machine. The chromic acid recovery tank comprises an outer tank body, and an inner tank container fixedly attached to the outer tank body is arranged in the outer tank body. Through structural innovation, material upgrading, automatic control and circulating purification, the pain point of a traditional technology is effectively solved, efficient recovery and resource utilization of chromic acid are achieved, and remarkable economic and environment-friendly values are achieved.