30results about How to "Uniform film layer" patented technology

The invention discloses a high silicon aluminum alloy anodic oxidation method and equipment thereof. The method comprises the steps as follows: A, after a high silicon aluminum alloy die casting is subjected to oil removing, abrasive water jet polishing treatment is performed; B, the polished high silicon aluminum alloy die casting is placed in a prepared anodic bath solution, rectangular wave pulse voltage is used for performing an anodic oxidation reaction, and the anodic oxidation reaction is stopped after an anodic oxidation film layer reaches a preset thickness; and C, after the high silicon aluminum alloy die casting with the anodic oxidation film layer is subjected to water washing and dyeing, hole sealing treatment is performed, so that a finished product is obtained. According to the method, pretreatment, anodic oxidation reaction and post treatment technologies of the anodic oxidation reaction of the high silicon aluminum alloy die casting are modified, so that the oxidation layer which is uniform, high in dimensional accuracy, compact and attractive is formed on the surface of the prepared high silicon aluminum alloy die casting; and compared with a conventional technology, the processing technology is more environment-friendly, the processing cost is lower, and large-scale industrial production can be realized more easily.

The invention discloses highly corrosion-resistant environment-friendly black phosphatizing liquid without nickel single component. Each liter of the treatment liquid consists of the following raw materials: 25-50g of main film forming agent, 5-25g of film forming aid, 0.1-3g of accelerant, 60-80g of grain refiner, 0.5-2g of stabilizer, 0.05-1g of blackening agent and 0.1-0.5g of blackening aid. The phosphatizing liquid disclosed by the invention can form a black phosphatized film on a steel surface by a one-step process. The phosphatized film has high blackness and high corrosion resistance, is uniform and avoids stripping; a copper sulfate spot test can reach 40min which is much longer than the national standard (2min); the phosphatizing liquid does not contain toxic and harmful substances such as nickel, nitrite and the like and causes little environmental pollution.

The invention discloses a Ti-Mg-B surface conditioner with stable performance and long service life for zinc-phosphating and a preparation method thereof. The surface conditioner comprises the following raw materials by weight percent: 1-10% of titanium sulfate or titanyl sulfate, 10-50% of disodium hydrogen phosphate, 5-15% of sodium pyrophosphate, 5-15% of sodium bicarbonate, 1-10% of magnesiumsulfate, 1-10% of borax, 1-8% of trisodium phosphate and 0.1-1.5% of polycarboxylic acid anionic organic compound. The preparation method comprises the following steps: using a defined amount of disodium hydrogen phosphate to prepare an aqueous solution with the concentration of 50%, adding half of a defined amount of sodium pyrophosphate, and defined amounts of titanium sulfate or titanyl sulfate, sodium bicarbonate, borax, trisodium phosphate and polycarboxylic acid anionic organic compound in the aqueous solution of disodium hydrogen phosphate, heating to 70-80 DEG C, fully stirring to obtain white powder with the water content of less than 5%, continuously stirring the powder at 80-100 DEG C while adding the residual sodium pyrophosphate and a defined amount of magnesium sulfate, and continuously stirring and drying to obtain powder with the water content of less than 2%.

The invention discloses a rare-earth modified Ti-Zr chemical passivation solution for surface treatment of aluminium profiles and a using method of the rare-earth modified Ti-Zr chemical passivation solution. The rare-earth modified Ti-Zr chemical passivation solution is characterized in that the passivation solution is a main salt for auxiliary film-formation, which takes rare-earth compounds as a Ti-Zr passivation treatment solution, and a passivation film is light yellow in appearance and has field judgement property on the quality of a formed film. A formula of the rare-earth modified Ti-Zr chemical passivation solution is as follows: each litre of solution contains 0.5g.L<-1>-10g.L<-1> of potassium fluotitanate (hexafluorotitanic acid), 0.5g.L<-1>-10g.L<-1> of potassium fluozirconate (fluozirconic acid), 0.5g.L<-1>-5g.L<-1> of cerium nitrate (ceric sulfate and ammonium ceric nitrate), 2g.L<-1>-10g.L<-1> of potassium nitrate, 0.5g.L<-1>-3g.L<-1> of sodium fluoride (potassium fluoride), 0.5g.L<-1>-1g.L<-1> of sodium dodecyl benzene sulfonate or OP-10, 0.2mL-5mL.L<-1> of nitric acid and 1g.L<-1>-5g.L<-1> of boric acid. The using method of the rare-earth modified Ti-Zr chemical passivation solution comprises the following steps of: (1) clearing dirt, such as dirt attached to an aluminium alloy; (2) pretreating the surface of the aluminium alloy; (3) carrying out passivating treatment on the surface of the aluminium alloy by using the rare-earth modified Ti-Zr chemical passivation solution; and (4) washing the aluminium alloy by using water and drying the aluminium alloy. The rare-earth modified Ti-Zr chemical passivation solution disclosed by the invention has the advantages of light yellow appearance, high film formation speed, simple process, uniformity in film layer, strong corrosion resistance, low environment pollution and the like.

The invention discloses a fluorine-containing polymer-based dielectric composite film. The dielectric composite film is prepared from conductive metal powder, calcium copper titanate, rubber particles and fluorine-containing polymer as raw materials in the presence of a compound liquid of N, N-dimethyl acetamide and polyacrylic acid as a solvent, wherein the mass ratio of components is (0-2.5): (10-30): (0-3): 10. The invention also discloses a preparation method of the composite film. The fluorine-containing polymer-based dielectric composite film is a dielectric composite film which has the advantages of high dielectric constant, high compressive strength, low dielectric loss and excellent elongation and controllable thickness.