4 results about "Electro polishing" patented technology

A method for creating oil-filled porous anodic oxide coatings for stainless steel is disclosed. The coating has anti-corrosion and omniphobic properties to resist both atmospheric conditions, or other conditions with exposure to vapor, and wet conditions, in which the coating is exposed to and / or immersed in liquid. The anodic oxide coating of the present invention can be made by the steps of cleaning and / or electropolishing a steel substrate, applying anodic oxidation to the steel substrate, washing the steel substrate in an organic solvent, and annealing the substrate at high temperature. To fill the porous coating with an oil, a solvent exchange method may be applied.

A medical product and a method of surface treatment and / or manufacture of a medical product. The medical product includes a metal or an alloy or consists of a metal or an alloy. The method includes the following steps: a) dulling a surface of the medical product, b) electropolishing the dulled surface of the medical product, c) electrochemically etching the dulled and electropolished surface of the medical product and d) electropolishing the dulled, electropolished and electrochemically etched surface of the medical product. The medical product has at least one of the following features:a pitting corrosion potential of 100 mV to 1200 mV, and / ora contact angle of 80° to 140°, and / ora passive layer having a thickness of 1 nm to 10 nm, which coats at least sections of the surface of the medical product.

The invention belongs to the technical field of electroforming stencil, and particularly relates to an electroforming stencil side wall roughness smoothing treatment technology, which comprises the following steps: carrying out infrared local heating treatment on a photoetching female die hole wall, controlling the temperature at 110-150 DEG C and the heating time at 1-10 seconds; oxygen plasma cleaning is adopted, the power is 200 W, the air pressure is 10 Pa, and the time is 60 seconds; electropolishing treatment is conducted by dynamically spraying electrolyte, the electrolyte comprises sulfuric acid, phosphoric acid, citric acid, benzotriazole, polyethylene glycol and lauryl sodium sulfate, and the pH value is controlled to be 2.5 + / -0.2; the roughness of the hole wall is reduced to Ralt; by renovating process control before the electroforming process, the bottleneck of hole wall roughness in the prior art is broken through, and a high-consistency and high-reliability screen printing plate manufacturing solution is provided for ultra-precision printing of solder paste and slurry.

The invention provides an electro-polishing method for an invar alloy base material. The electro-polishing method is a special electro-polishing method adaptive to the surface characteristics of the invar alloy base material thinned by ferric chloride. The method comprises the steps that an invar alloy base material to be treated serves as an anode, a pure lead plate serves as a cathode, and the anode and the cathode are immersed into an electrolytic bath containing electrolyte at the same time so as to conduct electropolishing on the invar alloy base material to be treated. Wherein the electrolyte comprises phosphoric acid, sulfuric acid, malic acid, ethylene glycol, sodium dodecyl benzene sulfonate and deionized water, and the volume ratio of the phosphoric acid to the sulfuric acid to the malic acid to the ethylene glycol to the sodium dodecyl benzene sulfonate to the deionized water is 6: 1: 1: 1: 0.5: 0.5. The invar alloy base material thinned by ferric chloride is subjected to electropolishing treatment by adopting the components and proportion of the electrolyte, and the invar alloy base material with excellent surface quality can be obtained. After polishing, the surface glossiness of the invar alloy base material is improved to be greater than or equal to 92 GU, and the surface of the invar alloy base material has a uniform and transparent mirror surface effect.