56results about How to "Reduced self-corrosion current density" patented technology

The invention discloses a method for preparing a cerium-manganese / molybdenum multi-element composite conversion coating on the surface of aluminum alloy. The method comprises the following steps of: (1) pretreating and activating the aluminum alloy; and (2) placing the aluminum alloy treated in the step (1) in Ce-Mn conditioning fluid so as to prepare the golden cerium-manganese conversion coating on the surface of the aluminum alloy; and (3) placing the aluminum alloy treated in the step (2) in Mo-containing conditioning fluid to obtain the cerium-manganese / molybdenum multi-element composite conversion coating. The conditioning fluids adopted in the method do not contain toxic substances. The multi-element composite conversion coating with excellent corrosion resistance and weather resistance as well as relatively good wear resistance can be prepared on the surface of aluminum alloy. The method is relatively simple in technology, simple and convenient to operate, low in cost and easy to industrialize.

The invention discloses a dust-proof temperature control type computer mainframe box. The dust-proof temperature control type computer mainframe box comprises a mainframe box body, the mainframe box body is a closed type structure, the top of the inner side of the mainframe box body is an inverted funnel-shaped structure, and an opening at the upper end of the inverted funnel-shaped structure is communicated with an air inlet of a micro air pump arranged outside the mainframe box body through a first pipeline; the portion, close to the bottom, in the mainframe box body is provided with a transverse partition plate, the transverse partition plate is provided with an air inlet, the transverse partition plate divides the inner portion of the mainframe box body into an equipment cavity used for containing a computer mainframe hardware and located on the upper portion and a water containing cavity used for containing cooling water and located on the lower portion, the bottom of the mainframe box body is provided with a groove used for containing the pipelines, and the top of the groove is provided with a plurality of second pipelines of which the upper portions stretch into the water containing cavity. The dust-proof temperature control type computer mainframe box has the advantages that the whole closed type structure is adopted, the hot air in the mainframe box body is cooled andthen transported into the mainframe box body by utilizing the cooling water, thereby having a temperature control effect and effectively preventing dust from entering the mainframe box body, and a method of an anti-corrosion layer coated on the outer surface of parts in contact with the cooling water is adopted to improve antibacterial, water-resistant and anti-corrosion performance of the parts.

The invention discloses a NbBN composite coating and a preparation method thereof. The NbBN composite coating is prepared by sputtering on a cemented carbide or ceramic substrate at a room temperature according to a double-target confocal radio-frequency reactive magnetron sputtering method, is 1.5 to 2.5 [mu]m thick, and comprises 0 to 9.65 at.% of the B component, 49.43 to 58.92 at.% of the Nb component, 39.8 to 41.2 at.% of the N component, and the balance of O. According to the NbBN composite coating and the preparation method, the mechanical properties, the corrosion resistance and the wear resistance of a NbN coating are further improved; and the NbBN composite coating is a protective coating with excellent overall properties, so as to be applied to the fields of high speed, dry cutting, corrosion protection and the like more widely.

The invention provides a corrosion-resistant conductive coating on the surface of a magnesium alloy and a preparation method of the corrosion-resistant conductive coating. The magnesium alloy is a common commercial AZ-series, ZK-series, WE-series and other as-cast, rolled and extruded magnesium alloy. The corrosion-resistant conductive coating is a double-layer-structure composite coating containing ATO, PANI and Graphene at the same time, the inner layer is an ATO-doped silicate-based micro-arc oxidation layer, the outer layer is an electrochemical deposition layer which is prepared through a cyclic voltammetry method and contains PANI and Graphene, and the thickness of the coating ranges from 8.5 micrometers to 20.6 micrometers. The preparation method comprises the steps of mechanical grinding, friction stir processing, micro-arc oxidation, cyclic voltammetry and annealing treatment. The magnesium alloy with the outer surface coated with the corrosion-resistant conductive coating prepared through the method provided by the invention can be used in the field of military electronic equipment.

The invention belongs to the technical field of magnesium alloy corrosion prevention, specifically provides a preparation method of a magnesium alloy surface anticorrosive coating, comprising the following steps of: (1) pretreating a magnesium alloy matrix; (2) heating the magnesium alloy matrix pretreated in the step (1) to 60-100 DEG C, then maintaining the temperature of the magnesium alloy matrix at 60-100 DEG C, taking iron-based amorphous alloy particles as a paint to be sprayed, carrying out hypersonic flame spraying on the surface of the magnesium alloy matrix, and obtaining an iron-based amorphous alloy anticorrosive coating on the surface of the magnesium alloy matrix. The preparation method provided by the invention does not deform the magnesium alloy matrix, the surface hardness reaches 580 HV 0.2, the self-corrosion potential of the iron-based amorphous alloy anticorrosive coating is higher than that of AZ91 magnesium alloy, and the self-corrosion current density is lowerthan that of AZ91 magnesium alloy.