12 results about "Cathodic polarization" patented technology

This invention discloses a high salt spray resistant stainless steel material and its preparation method, relating to the field of metal materials technology. In preparing the high salt spray resistant stainless steel material, the present invention involves weighing raw materials including Cr, Ni, Al, Si, Mn, Mo, Nb, C, Zr, Ti, and Fe according to specific mass percentages, and obtaining an alloy ingot through melting and casting; subjecting the alloy ingot to homogenization heat treatment and forging to obtain a stainless steel matrix; using the stainless steel matrix as the working electrode, surface modification is performed through cathodic polarization treatment in an electrolyte containing amidated carbon nanotube-boron nitride composite filler, thereby obtaining the high salt spray resistant stainless steel material. The high salt spray resistant stainless steel material prepared by this invention exhibits excellent salt spray corrosion resistance.

This invention discloses a MIL-100(Fe)-CdS-sodium alginate composite film for long-term photocathode protection in seawater environments and its preparation method, belonging to the field of photocathode protection technology. The method includes the following steps: cleaning conductive glass; growing a MIL-100(Fe) thin film on the conductive glass using a hydrothermal method; growing a MIL-100(Fe)-CdS composite film on the surface of the MIL-100(Fe) thin film using a dip-coating method; and growing sodium alginate (SA) hydrogel on the surface of the MIL-100(Fe)-CdS using an in-situ drop-coating method. This invention utilizes the heterojunction of MIL-100(Fe) and CdS, and uses a loaded sodium alginate hydrogel as a protective layer, solving the problem of severe photoelectric conversion efficiency degradation in existing photoanodes during long-term seawater immersion. After coupling with a metal, the current generated under illumination causes cathodic polarization of the metal, and the hydrogel layer delays the loss of active materials. The synergistic effect of these two factors results in long-term stable photochemical cathodic protection performance in seawater environments.

The invention discloses a Z-type heteroconfiguration WO3-C3N4-CdS composite film for photoelectric cathode protection and a preparation method and application thereof, and belongs to the technical field of photoelectric cathode protection, and the preparation method comprises the following steps: cleaning conductive glass; growing a WO3 film on the conductive glass through a hydrothermal method; a WO3-C3N4 composite film is obtained on the surface of the WO3 film through a thermal polymerization method; and the WO3-C3N4-CdS composite film is obtained through growth by a pulling and dipping method. The Z-type heterojunction WO3-C3N4-CdS is constructed by increasing the photoanode conductivity and the contact area through the C3N4 layer, the problem that in the prior art, a type II heterojunction is difficult to protect carbon steel with low self-corrosion potential is solved, the coupling potential of the prepared composite thin film and CS generates cathodic polarization during illumination, and the self-corrosion resistance of the composite thin film is improved. And sufficient protection is provided for metal, so that the metal shows long-acting and stable photoelectrochemical cathode protection performance in a seawater environment.

The utility model discloses an oil-water well casing pipe anti-corrosion protection device which comprises an anti-corrosion assembly, a central pipe is sleeved with the anti-corrosion assembly, a long insulating bush is sleeved with a temperature-resistant sacrificial anode, a short insulating bush is sleeved with a guide cylinder, and a plurality of spring contact arms are evenly arranged in the circumferential direction of the guide cylinder. The two ends of the spring contact arm are located at the two ends of the guide cylinder in the length direction respectively, and any end of the spring contact arm is connected with the temperature-resistant sacrificial anode. The long insulating bush and the short insulating bush are sleeved on the central tube, so that the corrosion resistance and the wear resistance of the central tube are improved, the temperature-resistant sacrificial anode, the sleeve and an oil-water well environment form a primary battery, so that the temperature-resistant sacrificial anode continuously provides protection current for the sleeve, active metal on the temperature-resistant sacrificial anode is easy to lose electrons, and the service life of the sleeve is prolonged. And the metal (sleeve) which is corroded and dissolved preferentially and is inactive is used as a cathode and is subjected to cathode polarization reaction, so that the metal (sleeve) is protected, and the corrosion prevention effect on the sleeve is achieved.

This invention belongs to the field of functional coating technology, specifically relating to an electrolyte for electrodeposition preparation of FeCoNiCu high-entropy alloy coatings and its application. The electrolyte includes FeSO4·7H2O, CoSO4·7H2O, NiSO4·6H2O, CuSO4·5H2O, H3BO3, sodium citrate, citric acid, NaCl, and additives. The additives are selected from at least one of o-phenanthroline, o-chlorobenzaldehyde, potassium thiocyanate, sodium 3-mercapto-1-propanesulfonate, and 4-(2-pyridinium azo)resorcinol. This electrolyte can prepare FeCoNiCu high-entropy alloy coatings with similar atomic ratios of metal elements in a one-step electrodeposition process, achieving co-deposition of four elements. The addition of additives can improve cathodic polarization, refine grains, and prepare a dense coating exhibiting excellent wear resistance. Simultaneously, the process is simple, low-cost, environmentally friendly, non-toxic, and safe.

The application discloses a kind of high-pressure polarization quantum dot electrode preparation process without attenuation, belongs to energy storage electrode preparation technical field.The process includes five core steps of quantum dot pretreatment, electrode coating, drying, two-way differentiation polarization, post-processing, by surface pretreatment to carbon quantum dots and silicon oxide quantum dots, optimize coating process, adopt two-way differentiation polarization of accurate temperature control, control field, combined with post-processing solidification, prepare anode polarization carbon quantum dot positive electrode and cathode polarization silicon oxide quantum dot negative electrode.The polarization quantum dot electrode prepared in the application has strong charge trap stability, non-decay charge density, complete electrode structure, no cracking, falling phenomenon when working in the range of 0.1V to infinite high voltage, adapts to infinite high-voltage energy storage device, solves the technical pain points of existing polarization electrode performance attenuation under high pressure, structure damage.

The invention relates to a high-strength corrosion-resistant stainless steel pipe and a preparation method thereof, and relates to the technical field of metal materials, the steel comprises less than or equal to 0.03% of C, 17.0-20.0% of Cr, 11.0-15.0% of Ni, 2.0-4.0% of Mo, 0.10-0.30% of N, 0.8-1.2% of Ta, 0.05-0.15% of Y, less than or equal to 1.0% of Si, less than or equal to 2.0% of Mn, less than or equal to 0.03% of P, less than or equal to 0.02% of S, and the balance Fe and inevitable impurities. Through gas-phase transmission gallium infiltration treatment and surface coating molybdate modified silane composite coating treatment in the preparation process, a synergistic system of a Ta-Y nano mosaic structure and Ga metal is formed on the surface layer of the pipe. In the structure, a Ta-Y nanophase improves the stability and pitting potential of a passive film through micro-area cathode polarization and electrostatic repulsion, and Ga can quickly respond to form protective gel when pitting occurs. More importantly, molybdate in the coating can react with Ta and Ga dissolved out of the matrix to generate a molybdenum-tantalum-gallium heteropolyacid compound to block pitting corrosion. The synergistic protection mechanism enables the stainless steel to maintain high strength in a harsh marine environment and to have excellent corrosion resistance at the same time.

The invention belongs to the technical field of civil engineering, and provides an electrochemical protection method for a reinforced concrete underground granary, which comprises the following steps of: continuously arranging auxiliary anodes in a cylinder wall and a bottom plate structure of the underground granary to form a uniform electric field; the periphery of the reinforcement cage is coated with conductive mortar, and an electric continuous system is formed; the anode of an external power supply is connected with the auxiliary anode through a rectifier, and the cathode is connected with a reinforcing mesh of the underground granary to form an impressed current cathodic protection loop; burying a reference electrode in the conductive mortar; the output current and potential are adjusted in real time through an electrochemical protection monitoring and control system, the output current or potential is automatically adjusted according to a preset protection potential range and a current density range, and constant potential or constant current control is carried out; the steel bars are kept in a stable cathodic polarization state through the controllable current, so that electrochemical corrosion of the steel bars is actively inhibited, and long-acting protection of the steel bars in the underground granary structure is achieved.

The invention relates to a corrosion-resistant sand control screen pipe, in particular to the field of corrosion protection of petroleum drilling and completion, and the corrosion-resistant sand control screen pipe comprises a screen pipe body, a corrosion-resistant body arranged on the screen pipe body and a protection body for protecting the corrosion-resistant body; a flow passage component of the screen pipe body is provided with a sand filtering component; and the electrode potential of the anti-corrosion body is smaller than that of the screen pipe body. According to the corrosion-resistant sand control screen pipe, electrons are transmitted to the screen pipe through the sacrificial anode material, so that cathodic polarization occurs on the surface of the screen pipe, corrosion of the sand screen is relieved or eliminated within a certain time, the normal service life of the screen pipe in an underground corrosion environment is prolonged, and then the use performance of the screen pipe is guaranteed.

The application discloses a kind of 0.1V to infinite high voltage bidirectional polarization quantum dot energy storage method and charge-discharge control method, belong to energy storage material technical field.Energy storage method includes: carbon quantum dot electrode is anodized, silicon oxide quantum dot electrode is cathodized, solid insulation layer is set between two poles to form electric field isolation, energy storage is realized by polarization charge trap and interface electrostatic field, work voltage is infinitely promoted by device unit series connection stacking, stable charge-discharge and high power output are maintained in 0.1V to infinite high voltage interval.Charge-discharge control method realizes low-voltage start, high-voltage energy storage and stable discharge by adjusting charging voltage and current and matching series connection unit quantity, and avoids performance degradation under high voltage.The application breaks through the voltage limit of traditional energy storage method, has high energy storage efficiency, fast charge-discharge speed and strong safety, and can be widely applied to various high-voltage energy storage scenes, to solve the technical problems of low voltage upper limit and complex control of existing energy storage method.

A surface-treated aluminum material (1) is provided with a base material (2) comprising aluminum or an aluminum alloy, and a protective film (3) formed on the base material (2). The protective film (3) has an oxide layer (31) that contains an aluminum oxide and covers the base material (2), and a hydrated oxide layer (32) that covers the oxide layer (31). The hydrated oxide layer (32) contains a hydroxide of aluminum and an oxide and / or hydroxide of a prescribed metal element. When cathodic polarization measurement of the base material (2) and the surface-treated aluminum material (1) after heating for 4 hours at a temperature of 200 DEG C is performed using a predetermined measurement solution, the ratio (J1 / J2) of the current density (J1) of the surface-treated aluminum material (1) at a predetermined potential to the current density (J2) of the base material (2) is 90 * 10-5 or less.

A surface-treated aluminum material (1) comprising: a base material (2) containing an aluminum alloy having a Cu content of more than 1.8 mass% and 6.8 mass% or less; and a protective film (3) formed on the base material (2). The protective film (3) has: an oxide layer (31) that contains an aluminum oxide and covers the base material (2); and a hydrated oxide layer (32) that contains a hydrated oxide of aluminum and covers the oxide layer (31). The cathodic polarization measurement of the base material (2) and the surface-treated aluminum material (1) after heating for 4 hours at a temperature of 200 DEG C using a specific measurement solution shows that the ratio (J1 / J2) of the current density (J1) of the surface-treated aluminum material (1) to the current density (J2) of the base material (2) at a specific potential is 7000 * 10-5 or less.