59results about How to "Effective corrosion" patented technology

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 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.