59results about How to "Effective corrosion" patented technology

The present invention provides a method of removing copper overlaying a tantalum-based barrier layer during the fabrication of a copper damascene structure having a plurality of copper lines. The method includes providing a chemical-mechanical polishing slurry and polishing the copper layer using the slurry until the tantalum-based barrier layer is exposed. The slurry includes an oxidizing agent that releases free radicals and a non-chelating free radical quencher that retards the corrosion of said copper lines during chemical mechanical polishing. Preferred non-chelating free radical quenchers are ascorbic acid, thiamine, 2-propanol, and alkyl glycols. The present invention also provides copper damascene structures formed according to the method.

A pigment grade corrosion inhibitor and a method of applying the inhibitor is disclosed. The inhibitor is comprised of a host species comprised of an inorganic compound having a layered structure and a guest species comprised an anionic species of a weak acid. The host species is preferably a double hydroxide having a structure of: [M(II)1-x M(III)x (OH−)2] [An−x / n·y H2O], where M(II) is a divalent metal cationic species, M(III) is a trivalent metal cationic species, and An− is an anionic species, preferably with the species present in a range of: 0.2≦M(III) / (M(II)+M(III))≦0.4. The guest species include: various phosphoric acids and derivatives thereof; boric acid; cyanamidic acid; nitrous acid; derivatives of thio- and dithiocarbonic acid; thio-organic compounds functionalized with at least one —SH group of acidic character, including: 2,5-dimercapto-1,3,4-thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4 thiadiazole, trithiocyanuric acid (TMT), and dithiocyanuric acid.

The invention includes ware detergent compositions which prevent buildup of precipitates and also surprisingly provides significant metal protection of items exposed to alkaline detergent composition. According to the invention alkaline ware detergents may include an effective amount of amino carboxylate. Surprisingly, detergents which included amino carboxylate also provided significant metal protection against corrosion, even when traditional corrosion inhibiting components are reduced.

The invention relates to chromium-free manganese-free coarsening liquid for ABS plastic and an application method thereof. With water as a solvent, the chromium-free manganese-free coarsening liquid is mainly prepared from following raw materials with the concentrations through mixing: 1 g / L-30 g / L of ferrous sulfate heptahydrate and 10 mL / L-100 mL / L of hydrogen peroxide. The pH of the chromium-free manganese-free coarsening liquid is 1-7. According to the chromium-free manganese-free coarsening liquid for ABS plastic, no chromic anhydride and no manganese at any valence state are added to thecoarsening liquid. In an acid system, the chromium-free manganese-free coarsening liquid achieves the higher oxidizing ability under the catalytic decomposition effect of H2O2 of Fe2+ so as to conduct effective corrosion on the ABS plastic to complete coarsening. Thus, the bonding force between a follow-up plating layer and a base material is good, and the requirements for electroplating production are met.

The invention relates to a novel brushless motor fuel pump. In the technical scheme, a brushless motor controller is connected outside the fuel pump, namely one end of an electronic plug-in part is connected with a fuel pump motor stator, and the other end of the electronic plug-in part is connected with the brushless motor controller; a vehicle-mounted power supply is connected outside and an integrated circuit is connected inside a voltage-stabilizing and filtering circuit in the brushless motor controller; the integrated circuit is respectively connected with a peripheral resistance-capacitance circuit and a three-phase bridge inverter; and a starting circuit and three-phase feedback voltage in the integrated circuit are connected with a phase locked logic phase change circuit respectively. The defects that a position sensor has low sealing property, ages quickly, is corroded, and the like are overcome. By a counter potential reversing technology, the pump can effectively resist fuel corrosion and fuel electric conduction, can be suitable for various liquid fuels such as gasoline, methanol, ethanol and the like, has high reliability, small volume, long service life and low price, is convenient to install, reduces a motor gap, and improves motor output and motor efficiency, and the volume of a pump body is reduced.

The invention discloses a back polishing process of a solar cell sheet. The back polishing process comprises the following steps of: preprocessing an unpolished silicon wafer; polishing the back sideof the silicon wafer; performing screen printing and drying. A silicon nitride film is grown by PECVD in the back polishing process to achieve good protection for a non-polished surface. The silicon wafer is successively polished by an alkali solution and an acid solution, which greatly improves the polishing quality of the silicon wafer. Thus, a good immersion polishing effect is achieved and theprobability of damaging the silicon wafer is reduced. An etching solution can corrode the textured surface on the back side of the cell and form a flat mirror structure to achieve a uniform polishingeffect and improve the reflectance and absorption rate of the silicon wafer. The silicon wafer of the back-polished silicon cell has a flat and bright back surface. The photons incident into the backsurface of the silicon wafer can be reflected only in one direction, thereby increasing the energy of the reflected light, exciting more electron-hole pairs, increasing the current of the cell sheet,and improve the efficiency of the cell sheet.

The invention discloses a preparation method of functional silver flakes, which includes the following steps of (A), preparing microcrystalline micro-silver powder containing silver oxide by means of primary reduction; (B), grinding silver flakes with a ball mill and then filtering the same to obtain silver slurry containing ball-milled dispersant; (C), treating the silver powder by etching and secondary reduction to obtain stereoscopic cross-linked structural silver flakes with 3-12% micro-silver powder, wherein a reducing agent A is an alcohol weak reductant while a reducing agent B is a strong reductant. The preparation method is simple in process, easy to realize mass production and applicable to large-scale production in the industry. The functional silver flakes prepared by the method have stereoscopic cross-linked reticular space structures, small in grain size and low in apparent density. Besides, since the functional silver flakes contain 3-10% of monocrystal or flocculent silver powder, point-surface contact among the silver powder and filling capability of the silver powder are improved, and conductivity is high.