47results about How to "Simple passivation process" patented technology

Integrated circuits, the key components in thousands of electronic and computer products, are generally built layer by layer on a silicon substrate. One common technique for forming layers is called chemical-vapor deposition (CVD.) Conventional CVD systems not only form layers that have non-uniform thickness, but also have large chambers that make the CVD process wasteful and slow. Accordingly, the inventor devised new CVD systems, methods, and apparatuses. One exemplary CVD system includes an outer chamber, a substrate holder, and a unique gas-distribution fixture. The fixture includes a gas-distribution surface having holes for dispensing a gas and a gas-confinement member that engages or cooperates with the substrate holder to form an inner chamber within the outer chamber. The inner chamber has a smaller volume than the outer chamber, which not only facilitates depositions of more uniform thickness, but also saves gas and speeds up the deposition process.

The invention provides a rare-earth passivation method for improving the corrosion resistance of a chromium carbide coating on a stainless steel surface, comprising the following steps of: carrying out deoiling and degreasing treatment on stainless steel plated with chromium carbide, and carrying out rare-earth passivation treatment. The rare-earth passivation method is characterized in that the rare-earth passivation treatment is that the stainless steel plated with the chromium carbide, which is subjected to the deoiling and degreasing treatment, is placed into a rare-earth passivation solution of KMnO4+Ce(NO3)3.6H2+Mg(NO3)2; then steps of washing and drying are carried out to obtain the passivated stainless steel plated with the chromium carbide. The rare-earth passivation method disclosed by the invention has the beneficial effects that simple passivation process, low machining cost, no pollution to the passivation solution and no influences on mechanical properties of the stainless steel plated with the chromium carbide. Meanwhile, a passivation process can obviously improve the corrosion resistance of the stainless steel plated with the chromium carbide.

The invention discloses a chromium-free passivation method of an aluminum pipe for an evaporator of a refrigerator or a freezer and a passivation solution thereof, belonging to the technical field of surface treatment of aluminum materials. The invention aims to improve the corrosion resistance of the aluminum pipe for the evaporator and the like of the refrigerator or the freezer. A passivation process is carried out on a CANFORM continuous extrusion aluminum pipe production line in an on-line way, the aluminum pipe formed by CANFORM continuous extrusion passes through a passivation groove after being water-cooled, and the passivation solution which has the components of passivator, assistant and solvent is filled into the groove, wherein vinyltris(beta-methoxyethoxy)silane the mass concentration of which is 1-15% is used as the passivator I, and dodecyl phosphate the mass concentration of which is 0.2-0.5% is used as the passivator II; benzotriazole or sodium silicate the concentration of which is 0.01-0.3% is used as the assistant; the mixture of water and 95% ethanol, the concentration of which is 3-8%, is used as the solvent; the passivation pH is 1.5-3.5, the passivation temperature is 35-50 DEG C, and the passivation time is 1-15 seconds; and the passivated aluminum pipe is packed with a rotating disk after being aired at 40-100 DEG C. The invention has the advantages of simple technical processes, low cost, high speed, on-line passivation, great improvement of corrosion resistance of the passivated aluminum pipe, and safety and environmental protection of medicaments and passivation processes.

The invention provides rare earth passivation liquid based on nanometer attapulgite and preparation and passivation processes thereof. The rare earth passivation liquid based on the nanometer attapulgite comprises rare earth coated natural bentonite, the nanometer attapulgite, a silane coupling agent, hydrogen peroxide, sulfuric acid, sodium nitrate and copper sulfate. The preparation method comprises the following steps: the silane coupling agent is added in ethanol water solution for uniform stirring, the nanometer attapulgite is added for uniform stirring to form nanometer attapulgite solution; the natural bentonite and rare earth elements are added in distilled water for magnetic stirring dissolution at room temperature to form rare earth coated bentonite solution; and after the two types of solution are mixed, aluminum silicate and auxiliaries are added for uniform mixing to form the rare earth passivation liquid based on the nanometer attapulgite. The silane coupling agent is used for modifying the rare earth elements, the nanometer attapulgite and the natural bentonite, and is combined with silicate; the prepared passivation liquid is stable and uniform; the passivation process is simple; the passivation effect is good; the use level of rare earth is reduced; and the cost is reduced.