7results about How to "Avoid excessive corrosion" patented technology

A highly efficient and environmentally friendly liquid metal degreasing agent and its preparation method are disclosed, belonging to the field of metal surface treatment technology. This degreasing agent is composed of a pH adjuster (a mixture of aminosulfonic acid and citric acid), a composite surfactant (a mixture of nonionic and anionic surfactants), a phosphorus-free chelating agent, a composite corrosion inhibitor, a defoamer, a detergent builder, and deionized water in specific weight proportions. The preparation method involves sequentially dissolving and mixing each component. This invention achieves highly efficient synergistic degreasing and rust removal under weakly acidic conditions. At room temperature, it provides excellent cleaning and corrosion protection for various metal substrates such as steel, aluminum alloys, and galvanized sheets. It is free of strong acids, phosphates, and heavy metals, making it environmentally friendly, safe, low-foaming, and stable. It is particularly suitable for automated spray production lines, comprehensively solving the problem of simultaneously achieving effective cleaning, substrate protection, and environmental protection requirements in existing technologies.

This application relates to a lead-bismuth removal cleaning solution, its preparation method, its application method, and its cleaning system. The lead-bismuth removal cleaning solution provided in this application has low volume fractions of hydrogen peroxide and acetic acid, making it mild and safe. Furthermore, by rationally proportioning the volume fractions of hydrogen peroxide and acetic acid, the solution can accelerate the dissolution of lead and bismuth. Moreover, the weakly acidic nature of the solution can prevent excessive corrosion of the materials being cleaned, thus ensuring their roughness and achieving a good lead-bismuth removal effect.

The invention belongs to the technical field of sea-island fiber treatment, and relates to a COPET / PET sea-island fiber and a control method for the splitting degree of the COPET / PET sea-island fiber. The sea phase of the COPET / PET sea-island fiber is COPET, the island phase has a skin-core structure, the base material of the island phase skin layer is PET or PTT, and the base material of the island phase core layer is PET; the COPET / PET sea-island fiber contains 0.02 wt%-0.06 wt% of a marker, and the marker has the characteristic of quantitative detection and is only dispersed in an island phase skin layer; and the mass ratio of the island facies skin layer in the island facies is not higher than 5%. The control method comprises the following steps: continuously splitting until the concentration Cm of a marker in alkali liquor used for splitting reaches 80%-98% of a reference value, and stopping splitting; the reference value is the theoretical concentration of the marker in the alkali liquor used for splitting when the splitting rate reaches 100%. According to the invention, real-time and convenient detection of the splitting degree is realized.

The application provides a composite plate structure display method, the composite plate is a composite plate of carbon steel and stainless steel, and the method comprises the following steps: surface treatment: after sampling the composite plate, polishing, cleaning and drying are performed on the surface of the sample; primary corrosion: a first corrosion solution composed of hydrogen peroxide, hexamethylenetetramine and water is used for corrosion, and cleaning and drying treatment are performed after the corrosion is completed; activation: an activation solution composed of citric acid and water is used for sample activation, and then cleaning and drying treatment are performed; secondary corrosion: a second corrosion solution composed of alcohol and nitric acid is used for corrosion, and cleaning and drying treatment are performed after the corrosion is completed; structure display: microscopic structure analysis is performed on the sample corroded for the second time under a microscope. The structure display method of the application corrodes the stainless steel and the carbon steel respectively, the carbon steel is not corroded when the stainless steel is corroded, over-corrosion of the carbon steel is avoided, and therefore the stainless steel and the carbon steel can be corroded to the right position respectively.

The invention discloses browning liquid for a printed circuit board as well as a preparation method and application of the browning liquid, and aims to solve the problems that the interlayer binding force of the printed circuit board treated by the existing browning liquid is insufficient, and the oxidation rate is not matched with the film forming rate. The browning liquid takes sulfuric acid as a main etching agent, organic acid as an auxiliary etching agent, hydrogen peroxide as a main oxidizing agent and nitrobenzenesulfonate as an auxiliary oxidizing agent, and is matched with functional components such as a buffering agent and a corrosion inhibitor. During preparation, the temperature is controlled to be 25-30 DEG C, the stirring speed is 200-300 r / min, and the materials are added And treatment is performed for 0.5-2 minutes at the temperature of 30-40 DEG Through component synergy, a browning film is compact and uniform, the peel strength is larger than or equal to 5.7 lb / in, layering and board explosion are avoided under thermal stress, the stability of the browning liquid is good, the browning liquid is suitable for precise manufacturing of high-end PCBs, and practicability and industrial value are both achieved.

The application discloses a desulfurization and mist removal integrated device based on wet flue gas desulfurization, and relates to the technical field of flue gas desulfurization.The device comprises a desulfurization tower, an oxidation reaction pool is arranged at the bottom of the inside of the desulfurization tower, an inner partition plate is arranged in the inside of the desulfurization tower, a smoke passing interval is arranged between the inner partition plate and the liquid surface of the oxidation reaction pool, a semicircular baffle is rotatably arranged at the top of the inner partition plate, a mist remover is fixedly arranged in the inside of the desulfurization tower, the mist remover is arranged above the semicircular baffle, a porous tray is fixedly arranged on one side of the bottom of the inner partition plate, and a spraying assembly is rotatably arranged in the inside of the inner partition plate.The device adopts a processing mode of first concentration and then dilution, thick smoke stays for a long time between the oxidation reaction pool and a thick smoke processing cavity, has more opportunities to fully contact with absorbents, forms more effective reactions, guarantees the removal of high-concentration sulfur dioxide, and enables the desulfurization tower to process larger-flow flue gas.

The application relates to a negative electrode sheet and application thereof, and the negative electrode sheet comprises a negative electrode current collector, a composite active layer located on at least one side of the negative electrode current collector, a protective film located on the side of the composite active layer away from the negative electrode current collector, and a passivation layer located between the negative electrode current collector and the composite active layer; the composite active layer comprises a three-dimensional skeleton with holes and a liquid alloy filled in part of the holes of the three-dimensional skeleton; the three-dimensional skeleton has a resilience rate of greater than or equal to 80%, and an average pore size of 100-200 nm; the liquid alloy has a melting point of less than or equal to 25 DEG C; the protective film comprises zero-dimensional nanocarbon materials and lithium diffusion materials; and the initial density of the protective film is greater than or equal to 85%. The negative electrode sheet has low volume expansion, the corrosion degree of the negative electrode current collector is low, and the creep of the material can be controlled to be Coble creep controlled by grain boundary diffusion, so that the cycle performance and safety of a corresponding solid-state battery are comprehensively improved.