6 results about "Sodium stannate" patented technology

The present application relates to a kind of ultrasonic reinforced sodium stannate preparation method of tin oxide sheet low temperature, belong to sodium stannate preparation technical field.The present application will high-purity tin sheet be added to sodium hydroxide solution, under the condition of ultrasonic wave, control sodium hydroxide solution temperature is 20~30 ℃, slowly add hydrogen peroxide to 20~30% of preset total addition amount after continuing ultrasonic reinforced oxidation reaction 7~10min;Again, slowly add hydrogen peroxide after multiple times, continue ultrasonic reinforced oxidation reaction, the addition amount of hydrogen peroxide is 10~15% of preset total addition amount each time, ultrasonic reinforced oxidation reaction 4~8min after each hydrogen peroxide is added;Hydrogen peroxide is completely added according to preset total addition amount, continue ultrasonic reinforced oxidation reaction until tin sheet completely dissolves and obtains sodium stannate solution;Sodium stannate solution is filtered, concentrated, separated, washed, dried in turn and obtains sodium stannate product.The present application strictly controls oxidation reaction temperature to 20~30 ℃, reduces hydrogen peroxide volatilization, uses ultrasonic to reinforce hydrogen peroxide oxidation effect, improves tin dissolution effect.

The application relates to the field of coating materials, and discloses a pure titanium material coating sensor for detecting low-concentration ammonia gas as well as a preparation method and application of the sensor. The sensor comprises a pure titanium material, a micro-arc oxidation coating and an electrode; the micro-arc oxidation coating is arranged on the surface of the pure titanium material through micro-arc oxidation of a sodium silicate, sodium stannate trihydrate and zinc acetate electrolyte; and the electrode is arranged on the micro-arc oxidation coating. The SnO2 / TiO2 coating capable of being applied to the detection of low-concentration ammonia gas under a high-humidity environment is formed on the surface of the pure titanium material through micro-arc oxidation of the composite electrolyte of sodium silicate, zinc acetate and sodium stannate trihydrate; the electrode is arranged, and the oxygen adsorption-desorption principle is utilized for detection; compared with conventional gases, the sensor exhibits excellent sensitivity and selectivity to ammonia gas, and therefore can effectively, timely and simply detect ammonia gas.

This invention discloses a full-ocean-depth metal-seawater fuel cell. The metal anode material mainly comprises one or more of the following components: Mg, Sn, B, La, Ce, Pr, Nd, Dy, Sm, Ti, and Ca, with the balance being Al. The electrolyte of this invention is a mixed aqueous solution of natural seawater, sodium stannate, zinc oxide, zinc sulfate, sodium carbonate, and cerium chloride, with the pH adjusted to between 12 and 14. The metal anode of this invention, in the above electrolyte, not only significantly reduces the hydrogen evolution corrosion rate but also directionally induces product formation, thereby improving electrochemical performance. The preparation method of this metal anode and electrolyte is simple, applicable to different temperature and pressure variations and operating current densities, and can be applied to metal-seawater fuel cells under various operating conditions at full ocean depth.

The invention belongs to the technical field of surface treatment, and particularly relates to a cyanide-free lead-free cupronickel tin electroplating process which comprises the following steps: adding methionine copper, sodium stannate, potassium hydroxide, zinc oxide, potassium carbonate, conducting salt, a brightener, sodium phosphite, 3-aminobenzoic acid ethyl ester methyl sulfonate and a wetting agent to form a plating solution; starting mechanical stirring, heating to a required temperature, putting the workpiece into the plating solution, electroplating, and controlling the current density, the metal ion concentration of the plating solution and the temperature to be within a preset range. According to the copper methionine serving as a copper source, copper is coordinated and combined with amino and carboxyl of methionine to form stable inner complex salt, and the advantage of remarkable hydrolysis resistance is achieved. And multiple coordination groups of methionine anions are chelated with Cu < 2 + >, so that free Cu < 2 + > is stabilized, and refining of coating crystallization is assisted. Sodium phosphite focuses on binding with stannate ions to reduce the reduction potential of tin, and ethyl 3-aminobenzoate methyl sulfonate is preferentially chelated with Cu < 2 + > to improve the reduction potential of copper, so that the problem of large potential difference between copper and tin is solved.

This invention discloses a vermiculite-based flame-retardant and smoke-suppressing filler, its preparation method, and its application in silicone foam, belonging to the technical field of flame retardant and flame-retardant material preparation. This invention utilizes expanded vermiculite, sodium stannate, zinc sulfate, etc., as raw materials, and synthesizes zinc hydroxystannate nanoparticles on the surface of expanded vermiculite via an in-situ precipitation method, obtaining a flame-retardant and smoke-suppressing functional filler composed of zinc hydroxystannate encapsulating expanded vermiculite. The synthesis of this filler is completed in an aqueous phase, the preparation process is simple and environmentally friendly, and it exhibits good compatibility with silicone foam, effectively improving its flame-retardant and smoke-suppressing properties, showing broad application prospects in flame-retardant and smoke-suppressing silicone foam.

The invention relates to an aluminum alloy surface environment-friendly chemical passivator and a preparation method and application thereof, and belongs to the technical field of metal surface treatment. The passivating agent is in a liquid state and is prepared from the following raw materials: 60 g / L-80 g / L of potassium permanganate, 36 g / L-54 g / L of aluminum sulfate, 0.9 g / L-1. 2 g / L of a stabilizer, 100 ml / L-200 ml / L of concentrated sulfuric acid and the balance of water in each liter of solution; the stabilizer is prepared from sodium stannate, sodium pyrosulfate and 8-hydroxyquinoline; the passivator is prepared by fully mixing the raw materials. According to the application method, the aluminum alloy with the clean and dry surface is soaked in the passivating agent, and a passivation layer can be formed on the surface of the aluminum alloy; the treatment time of the application is shortened to 0.5 min-2 min, meanwhile, the applicable temperature range is expanded to 35 DEG C-50 DEG C, and the feasibility of industrial production is greatly improved.