125results about How to "Improve the effect of cathodic protection" patented technology

The invention discloses a rare earth aluminum alloy wire for thermal spraying, which belongs to the technical field of thermal spraying. The wire contains aluminum, zinc, magnesium and the like, and also contains two or more than two rare earth metal elements, and the total weight of rare earth metal elements accounts for 0.51-5.00% of the total weight of the wire. The invention has the advantages that the processing and manufacturing process is convenient and the product coat cost is moderate; and the metal thermal spraying coating made from the wire has good adhering capability, good physical and mechanical property, good corrosion-resistant property, and moderate construction cost, and is favorable for popularization and application.

There is disclosed a system for reducing drag and/or vortex induced vibration of a structure, the system comprising a fairing defining a plurality of perforations, wherein the fairing is suitable for placement around the structure, the perforations defining a porosity of the fairing of at least 1%.

The invention relates to a nano composite cold galvanized coating and a preparation method thereof and belongs to the field of nano coatings. The nano composite cold galvanized coating is prepared from the following raw materials in parts by weight: 2-25 parts of acrylic resin, 0.1-5 parts of an assistant, 75-98 parts of zinc powder and 1-70 parts of a solvent, wherein the zinc powder is a mixture of micro-scale zinc powder and nano-scale zinc powder modified by a fluorosilane coupling agent, so that the dispersity of the zinc powder is increased; the compatibility with resin is improved; the coat made of the nano composite cold galvanized coating has high hydrophobic property; the water contact angle is greater than or equal to 135 degrees; the porosity of the cold galvanized coating is significantly reduced; the corrosion resistance of the coating is improved; the nano composite cold galvanized coating disclosed by the invention can be widely applied to anti-corrosion engineering with a novel steel structure, old and new hot-dip galvanizing structures and an electric galvanized steel structure; and the difficulty in corrosion maintenance of transmission and substation facilities and substation equipments can be conveniently and rapidly solved.

The invention provides a preparation method of a CdSe/CdS quantum dot sensitized TiO2 nanometer tube composite film, which relates to a nanometer tube composite film. A titanium foil is used as a substrate, ammonium fluoride is dissolved into deionized water, glycerin is added for carrying out calcination after the anode oxidation, CdS quantum dos are firstly deposited on the surface of a TiO2 nanometer tube array film, Cd(NO3)2 ethanol solution and Na2S methanol solution are respectively used as reaction solution, firstly, TiO2 nanometer tube array film samples are soaked in Cd<2+> ethanol solution, then, ethanol is used for flushing, next, the samples are soaked into methanol solution containing S<2-> and are than flushed by the ethanol, CdS/TiO2 composite films are obtained, the obtained CdS/TiO2 composite films are placed into mixed solution consisting of Na2SeSO3, Cd(NO3)2 and Na3NTA solution for carrying out deposition reaction, and the CdSe/CdS quantum dot sensitized TiO2 nanometer tube composite film is obtained.

The invention provides a thin-coating two-component anticorrosive coating for the surface of a precise steel structural part, wherein the two-component anticorrosive coating is composed of a componentA and a component B. The component A is composed of an epoxy resin liquid, graphene slurry, a zinc powder, flaky pigments and fillers, an auxiliary agent and a diluent. The component B is composed ofa polyamide curing agent and a mixture of xylene, n-butanol and cyclohexanone. The component A and the component B are evenly mixed according to the weight ratio of (5-15):1. The graphene slurry is prepared by adding powdery graphene and a dispersant into a mixed solvent under a stirring state, and dispersing in an ultrasonic oscillator to obtain the stable dispersed slurry. A coating layer has excellent cathodic protection effect, can be thin-coated to about 10-15 microns, still has good corrosion resistance, and can partly replace traditional phosphorization and oxidation processes.

A metal ceramic anticorrosive paint mainly includes kaolin, nanometer aluminium powder, nano alumina, silicon carbide, nano quartz powder, ceramic powder, asbestos powder, graphite powder, a pigment, a filler, epoxy resin, an additive and a mixed organic solvent. The solid powders are subjected to nano ultrafine treatment to reach a granularity of 20-200 nm. The paint provided by the invention is a single-component paint, which is simple in manufacturing process, economical and environment-friendly. The coating of the paint does not require a primer and can be used alone without adding special finish. The coating has excellent wear resistance, corrosion resistance, impact resistance, stability, strong adhesion, compactness and stability, and can effectively prevent erosion by acid, alkali, salt and seawater. In addition, the paint can be widely applied to oil pipeline, oil storage tank, chemical equipment, ships, bridges, offshore platforms and other steel structure buildings.

The invention discloses a multicomponent alloy composite anticorrosive coating for a metal pipe/pipe fitting, which comprises a Zn-Al-Mg-RE multicomponent alloy layer and a hole-sealing finishing layer, wherein the hole-sealing finishing layer is coated on the surface of the Zn-Al-Mg-RE multicomponent alloy layer, the Zn-Al-Mg-RE multicomponent alloy layer comprises the following components by weight percentage: 56-83% of Zn, 16-41% of Al, 0.05-2.0% of Mg and 0.05-1.0% of Re, and the hole sealing finishing layer is an organic or inorganic coating layer. The multicomponent alloy composite anticorrosive coating disclosed by the invention has the advantages of low porosity, good anticorrosive property and the like.

The present invention provides a heavy-duty graphene primer for ocean ships and a preparation method thereof. The primer is prepared by mixing a plurality of antirust pigments, fillers and solvents, such as modified epoxide resin, additives, nanoscale graphene, zinc powder and diphenyl guanidine chromate, with a modified amine and a polyamide, and has long-term corrosion resistance and also advantages unmatched by other graphene primers, including wide scope of application, convenience in construction, excellent electrical conductivity, and good self-repair performance and hydrophobic and oleophobic properties of the coating. In addition, the primer is air-dried at normal temperature, thereby saving energy and facilitating industrialization thereof.

The invention provides hot dipping steel and a manufacturing method thereof. The hot dipping steel comprises a steel substrate and a zinc-aluminum-magnesium coating formed on the steel substrate. The zinc-aluminum-magnesium coating comprises, by the total weight of the coating, 1%-4% of Mg, 1%-4% of Al, 0.01%-0.1% of Ca and/or Ba, 0.1%-0.4% of Li, 0.1%-10% by volume of Zn-Mg phase and/or Zn-Mg-Al phase. According the hot dipping steel and the manufacturing method thereof, in order to avoid coating flow lines and blackening defects, a small number of other alloy elements are added to a plating bath, so that cathode protection ability is improved, and the hot dipping process is optimized. Therefore, the hot dipping steel which has good cathode protection performance for an aluminum plate and a good coating appearance is obtained, and the corrosion resistance is improved to a certain extent.

The invention relates to the coating field, in particular to a water-based heavy-duty anti-corrosive coating and a preparation method thereof. The water-based heavy-duty anti-corrosive coating comprises a component A and a component B in the weight ratio being (2-6):1. The component A comprises, in parts by weight, 12-40 parts of zinc powder, 0.2-5 parts of graphene slurry, 20-65 parts of an antirust pigment and 8-25 parts of a hydrophilic epoxy curing agent. A layered netted conductive structure can be formed in the coating by adding uniformly dispersed graphene, the zinc powder can be fullyand effectively utilized, the cathodic protection function of the zinc powder can be improved, the protection of the coating for a base material is strengthened, the shielding performance of a coatingfilm is improved, and the usage amount of the zinc powder is substantially reduced.

The invention discloses a MnS/TiO2 composite nanotube array film for photo-induced cathodic protection and preparation and an application thereof, and relates to a composite nanotube photo-anode. The method includes the following steps: 1) substrate pretreatment: selecting a titanium foil as a substrate, carrying out ultrasonic cleaning successively in acetone, absolute ethyl alcohol and deionized water; 2) preparation of a TiO2 nanotube array thin film: adopting a two-step anodic oxidation method, with a platinum sheet as a counter electrode, in a working fluid, carrying out oxidization and calcination treatment on a titanium sheet, and generating a regular-morphology TiO2 nanotube array thin film on the substrate surface; and 3) preparation of the MnS/TiO2 composite film: adopting a continuous ionic layer adsorption reaction method, modifying TiO2 with MnS, and then carrying out calcination treatment to obtain the MnS/TiO2 nanotube array composite photo-anode. The method can significantly reduce the corrosion potential of 304 stainless steel, and has the characteristics of simple, feasible, safe and reliable operations, and high photoelectric conversion efficiency and stable performance of the product.

The invention relates to a preparation method of a TiO2/SnO2 semiconductor two-layer composite film photo anode and relates to a semiconductor photo anode. The invention provides the preparation method of the TiO2/SnO2 semiconductor two-layer composite film photo anode with an efficient photo-induced cathodic protection effect. The preparation method comprises the following steps: 1) by using stainless steel as a matrix sample, grinding the surface of the matrix sample to a mirror surface, and then cleaning; 2) dissolving SnCl2.2H2O in water, then adding NaNO3 and nitric acid to prepare an electrolyte solution, and then adding water to fix the volume to 1000mL; by using platinum as a counter electrode and saturated mercurous chloride as a reference electrode and the matrix sample as a working electrode, in the electrolyte solution, electro-depositing and drying, namely electro-depositing a SnO2 film layer on the surface of the matrix sample; and 3) sputtering a TiO2 film on the surface of the SnO2 film layer obtained in the step 2), and then thermally treating to obtain the TiO2/SnO2 semiconductor two-layer composite film photo anode. The photo-induced cathodic protection effect on metals by a TiO2 nano thin film in dark state is improved.

The invention discloses a preparation method of an energy storage tungsten trioxide/strontium titanate/titanium dioxide nanometer composite film photoanode, and relates to a photoanode. A titanium foil is used as a basal body for ultrasonic operation in acetone, anhydrous ethanol and de-ionized water; a titanium basal body sample is used as an anode; a platinum piece is used as a cathode; after the anode is oxidized, a prepared sample is cleaned and dried to obtain a TiO2 nanotube array film; the TiO2 nanotube array film is put in a polytetrafluoroethylene reaction kettle; mixed solution containing Sr(COOH)2 and KOH is added for hydrothermal reaction; the sample is taken out to dip in HCl solution for cleaning, drying and calcining; and a SrTiO3/TiO2 composite film is obtained. The SrTiO3/TiO2 composite film is used as a working electrode; the platinum piece and a saturated calomel electrode are used as an auxiliary electrode and a reference electrode; constant potential is applied to an electrolytic cell for electric deposition to prepare WO3 on the surface of the SrTiO3/TiO2 composite film; and the sample is flushed by de-ionized water, and is calcined after drying to obtain the photoanode.

The invention discloses a waterborne epoxy graphene zinc anticorrosive coating. The waterborne epoxy graphene zinc anticorrosive coating comprises a first component and a second component, wherein thefirst component is prepared from the following components in parts by weight: 5-10 parts of a waterborne epoxy resin curing agent, 0.5-1 part of a dispersant, 1-3 parts of an anti-settling agent, 1-3parts of a coalescing agent, 10-15 parts of body pigment, 42-65 parts of zinc powder and 4.5-5 parts of graphene dispersion slurry. The second component is prepared from the following components in parts by weight: 30-40 parts of aqueous epoxy emulsion, 1-2 parts of an anti-flash rust agent, 5-15 parts of water and 0.2-0.8 part of a defoaming agent. The waterborne epoxy graphene zinc anticorrosive coating has high utilization rate of zinc powder and is easy to prepare, and the formed coating has excellent comprehensive properties, such as good compactness, excellent cathodic protection performance and shielding performance, anticorrosive performance is remarkably improved, and the waterborne epoxy graphene zinc anticorrosive coating has wide application prospects in the field of marine equipment anticorrosion.

The invention relates to a pulse width modulation based cathode protection method. The pulse width modulation based cathode protection method comprises the following steps: firstly, connecting a buried pipeline facility by adopting a pulse width modulation polarization power supply; secondly, setting a cathode protective potential to a predetermined value; thirdly, generating a pulse width modulation signal according to cathode protective potential value; fourthly, driving the pulse width modulation polarization power supply by the pulse width modulation signal; fifthly, measuring output voltage of the pulse width modulation polarization power supply, measuring output current of the pulse width modulation polarization power supply; sixthly, measuring cathode protective potential, relative to a reference electrode, of the buried pipeline facility; a pulse width modulation based cathode protection device is characterized in that the pulse width modulation polarization power supply is connected with an output current measuring device and an output voltage measuring device, the pulse width modulation polarization power supply is connected with a buried facility, an auxiliary anode and an on-off controller, a control circuit is connected with a feedback signal controller by virtue of a protective potential setting device, and a cathode protective potential measuring device is connected with a buried reference electrode by virtue of a copper sulphate reference electrode impedance converter, so that size is small and control accuracy is high.

The invention relates to a nanotube composite membrane and particularly relates to a preparing method of a graphene sensitized CdSe/TiO2 nanotube composite membrane. The method includes: a step of performing anodic oxidation and then calcination by adopting titanium foil as a substrate, adopting a hydrofluoric acid solution as an electrolyte solution and adopting platinum as a counter electrode so as to prepare a TiO2 nanotube array membrane on the surfaces of titanium; a step of depositing graphene quantum dots onto the surfaces of the TiO2 nanotube array membrane by adoption of a cyclic voltammetry deposition method, namely a step of depositing graphene onto the surfaces of the TiO2 nanotube array membrane to prepare a graphene/TiO2 composite membrane by adopting a prepared graphene oxide solution as an electrolyte solution, adopting platinum as a counter electrode and adopting a saturated calomel electrode (SCE) as a reference electrode; and a step of depositing CdSe quantum dots onto the surfaces of the prepared graphene/TiO2 composite membrane, namely a step of depositing CdSe onto the surfaces of the graphene/TiO2 composite membrane to prepare the graphene sensitized CdSe/TiO2 nanotube composite membrane by adopting a mixed solution of SeO2, CdSO4 and sulfuric acid as an electrolyte solution, adopting platinum as a counter electrode and adopting a saturated calomel electrode (SCE) as a reference electrode.

The invention relates to a preparation method of a graphene/CdTe-TiO2 composite membrane photo-anode for photo-induced cathodic protection and relates to a composite membrane photo-anode. The invention provides an efficient preparation method of the graphene/CdTe-TiO2 composite membrane photo-anode for photo-induced cathodic protection. The method comprises the following steps: sequentially carrying out anodic oxidation and calcining by taking a titanium foil as a matrix, taking a hydrofluoric solution as an electrolyte solution and taking platinum as a counter electrode, so that a TiO2 nanotube array membrane can be prepared on the titanium surface; firstly, by using a cyclic voltammetric deposition method, depositing graphene quantum dots on the surface of the TiO2 nanotube array membrane, and by taking a prepared graphene oxide solution as an electrolyte solution, taking platinum as a counter electrode and taking saturated calomel electrode (SCE) as a reference electrode, depositing graphene on the surface of the TiO2 nanotube array membrane, so that a graphene/TiO2 composite membrane is obtained; and then depositing CdTe quantum dots on the surface of the obtained graphene/TiO2 composite membrane, and by taking a mixed solution of TeO2, CdSO4 and a hydrochloric acid as an electrolyte solution, taking platinum as a counter electrode and taking a saturated calomel electrode (SCE) as a reference electrode, depositing CdTe on the surface of the graphene/TiO2 composite membrane, so that a graphene/CdTe-TiO2 composite membrane is prepared finally.

The invention belongs to the technical field of nanometer materials and particularly relates to a Bi2Se3/TiO2 nano composite film as well as preparation and application of the Bi2Se3/TiO2 nano composite film in photoproduction cathodic protection. Preparation of the Bi2Se3/TiO2 nano composite film comprises the following steps: at first, the anodic oxidation method is adopted to prepare a TiO2 nanotube array film on the surface of a pretreated titanium substrate sample, then, the chemical bath sedimentation method is adopted to prepare Bi2Se3 nanoflowers on the surface of TiO2, and the obtained TiO2 nanotube array film and Bi2Se3 nanoflowers uniformly distributed on the surface of the TiO2 nanotube array film constitute the Bi2Se3/TiO2 nano composite film with the NN type heterostructure.The ultraviolet visible diffuse reflection absorption spectrum of the Bi2Se3/TiO2 nano composite film indicates that the Bi2Se3/TiO2 nano composite film has the visible light absorption effect betterthan that of TiO2. After the Bi2Se3/TiO2 nano composite film is coupled with stainless steel 304, the open circuit potential-time curve indicates that the open circuit potential of stainless steel 304reaches -996mV, indicating that stainless steel 304 has already entered an excellent cathodic protection state.