14results about "Chromatisation" patented technology

The utility model provides equipment for improving the surface wettability of a tin plate, which comprises a shell, the shell is inverted T-shaped, a conveyor belt is horizontally erected at the lower part of the shell, the conveyor belt has conductivity and is grounded, a discharge unit is arranged at the upper part of the shell, the discharge unit comprises a cover shell, and the cover shell is arranged on the lower part of the shell. The cover shell is located above the conveying belt, a plurality of ceramic tubes are horizontally arranged on the lower portion of the cover shell side by side, and discharge electrodes are arranged on the side walls of the ceramic tubes. The utility model provides novel equipment for improving the surface wettability of the tin-plated plate, and is beneficial to reducing the energy consumption and improving the product quality.

To provide a method for producing a trivalent chromium plated product having corrosion resistance, and to provide a trivalent chromium plated product.SOLUTION: The method for producing a trivalent chromium plated product of the present invention is a method for producing a plated product having a trivalent chromium plating film. The method for producing a trivalent chromium plated product of the present invention includes a plating treatment step of applying a current to an object to be plated as a cathode in a trivalent chromium plating solution to obtain a plated product, and a post-treatment step of electrolyzing or acid-immersing the plated product obtained in the plating treatment step.SELECTED DRAWING: None

Provided are a ferritic stainless steel used for bipolar plates of fuel cells, a controlling method of surface roughness, a method of forming passivation films, and use. The ferritic stainless steel comprises C of less than or equal to 0.03 wt. %, N of less than or equal to 0.02 wt. %, Si of less than or equal to 0.4 wt. %, Mn of less than or equal to 0.5 wt. %, Cr of 16-23 wt. %, Cu of 0-2.0 wt. %, Mo of 1.8-2.5 wt. %, Ni of 0.2-2.0 wt. %, Ti of 0.1-0.5 wt. %, Nb of 0.005-0.5 wt. %, P of less than or equal to 0.02 wt. %, S of less than or equal to 0.02 wt. %, and a remainder composed of Fe and other unavoidable accompanying elements, and the ferritic stainless steel has a grain size number of 4-9. The ferritic stainless steel has excellent corrosion resistance and electrical conductivity, and good elongation and deformation as well, exhibiting both economy and cost advantages.

This surface-treated copper foil, comprising a heat-resistant treatment layer and a chromate treatment layer but without a roughening treatment layer, exhibits excellent heat resistance and corrosion resistance. Furthermore, because the amount of nickel and chromium adhering to the treated surface is small, there is less conductor loss due to dissimilar metals, and because of its low roughness and lack of conductor loss due to roughening particles, it is suitable for copper-clad laminates used in high-speed transmission printed circuit boards. [Solution] The arithmetic mean height Sa of the untreated copper foil surface is less than 0.27 μm, the unfolded interface area ratio Sdr is less than 6%, the surface area ratio calculated from Sdr is A, and the two-dimensional area of ​​the surface-treated copper foil surface is 1 m². 2 When the amount of nickel deposited per unit area (mg) is B, the surface area is 1 m². 2 The amount of nickel deposited per unit [B / A] is 5 mg to 31 mg, and the two-dimensional area of ​​the surface-treated copper foil surface is 1 m². 2 When the amount of chromium deposited per unit area (mg) is C, the surface area is 1 m². 2 Surface-treated copper foil with a chromium content per unit area [C / A] of 1 mg to 4 mg.

The present invention relates to a tinplate steel sheet with an extremely low tin content (0.30-0.85 g / m 2 ) and a method for manufacturing the same, and a passivation method for the tinplate steel sheet. The tinplate steel sheet of the present invention has excellent finishing properties (paint film adhesion) and corrosion resistance, while having an extremely low tin content. The passivation method of the present invention can effectively compensate for the insufficient corrosion resistance caused by the low tin content, improve the service life of the steel sheet, and optimize the production cost and process flow.

A trivalent chromium plating product according to the present disclosure is obtained by a trivalent chromium plating treatment. The color difference ΔE of the plating film of the trivalent chromium plating product from a hexavalent chromium plating film is less than 3.5.

The application belongs to the technical field of tin-plated materials, and relates to a high-sulfur-resistance tin-plated plate and a preparation method and application thereof. The high-sulfur-resistance tin-plated plate comprises a first passivation layer, a first tin-plated layer, a first multi-element alloy layer, a tin-plated substrate layer, a second multi-element alloy layer, a second tin-plated layer and a second passivation layer arranged in sequence. The surface of the first passivation layer away from the first tin-plated layer is an inner coating surface. The surface of the second passivation layer away from the second tin-plated layer is an outer coating surface. The arithmetic average roughness of the inner coating surface is 0.4-0.5 microns, the profile skewness is 0-0.3, and the profile kurtosis is 2.5-3. The arithmetic average roughness of the outer coating surface is 0.6-0.7 microns, the profile skewness is 0-0.3, and the profile kurtosis is 2.5-3. The first multi-element alloy layer and the second multi-element alloy layer each independently comprise gallium. The high-sulfur-resistance tin-plated plate has strong bonding force between the film layers, excellent deformation resistance and excellent sulfur resistance.

This application relates to a tin-plated steel sheet and its preparation method for irregularly shaped food packaging cans, belonging to the technical field of metal packaging material preparation. The tin-plated steel sheet comprises a steel substrate and a coating attached to the surface of the steel substrate by mass fraction. The chemical composition of the steel substrate, by mass fraction, is: C: 0.001%~0.009%, Si≤0.025%, Mn: 0.20%~0.40%, P≤0.012%, S≤0.008%, Als: 0.020%~0.040%, N≤0.003%, with the remainder being Fe and unavoidable impurities. The coating comprises a tin layer and a passivation layer. An ultra-low carbon composition and a bell-type annealing process are used to form a disc-shaped ferrite structure in the steel substrate. This structure reduces dissolved carbon and eliminates cementite, thereby increasing elongation and suppressing the earing effect. The hot rolling process employs high-temperature final rolling technology to avoid edge mixing and ensure uniform microstructure. The surface treatment uses an unmelted tin layer for lubrication, combined with high-chromium passivation to form a dense protective film. This process gives tin-plated steel sheets excellent deep-drawing formability and corrosion resistance, solving the problems of corner cracking and storage corrosion leakage in irregularly shaped cans.

The invention provides a high heat-resistant antioxidant solution for lithium battery copper foil, including hexavalent chromium and organic compounds containing heteroatoms, and the heteroatoms include N, O, S or P.

This invention relates to the field of alloy materials technology, and discloses a tinplate for easy-open lids and its manufacturing method. The method includes the following steps: steelmaking, continuous casting, hot rolling, pickling, cold rolling, annealing, leveling, and electroplating with tin. The manufacturing method of the tinplate provided by this invention adopts a low-carbon, low-manganese, and high-nitrogen composition design, eliminating the need for additional Mn, B, Ti, and other alloys, resulting in low smelting costs. Furthermore, by employing an annealing process related to N content, the precipitation strengthening and solid solution strengthening effects of N atoms are fully utilized, enabling the tinplate to achieve a hardness of 65±2 (HR30T). Simultaneously, due to the small fluctuation in N content and the adjustment of the annealing temperature for tinplates with different N contents, the final result is a high hardness with minimal fluctuation. The manufacturing method of this invention features low production costs, simple process control, high manufacturing efficiency, and excellent product quality.

To provide a product of trivalent chromium plating having a glossy appearance equivalent to that of hexavalent chromium plating.SOLUTION: The trivalent chromium plated product of the present disclosure is a trivalent chromium plated product treated with trivalent chromium plating. The color difference Δ E between the plating film of the trivalent chromium plating product and the hexavalent chromium plating film is less than 3.5.SELECTED DRAWING: None

The utility model discloses a titanium tetrachloride roughing system, which comprises a dust removal unit, a heating unit, a heating unit, a heating unit and a control unit, and is characterized in that the dust removal unit is used for collecting dust of titanium tetrachloride flue gas discharged by a chlorination furnace; the cooling unit is used for cooling the titanium tetrachloride flue gas subjected to dust collection treatment, collecting to obtain a titanium tetrachloride crude product and discharging tail gas with the temperature less than or equal to 70 DEG C at the same time; a membrane filtration unit is arranged behind the cooling unit and is used for carrying out liquid-solid separation membrane filtration treatment on the titanium tetrachloride crude product to obtain a titanium tetrachloride crude product filtrate; the dust removal efficiency of the dust removal unit and the filtering efficiency of the rear membrane filtering unit of the cooling unit are superposed, so that the mass percentage content of solids in the titanium tetrachloride crude product filtrate is less than or equal to 0.1%; in addition, the titanium tetrachloride flue gas in the whole titanium tetrachloride flue gas flowing path formed from the chlorination furnace to the cooling unit is naturally cooled. The dust removal unit is allowed to have relatively low dust removal efficiency, and meanwhile, the high-purity standard of a final titanium tetrachloride crude product is achieved through the cooling unit and the rear membrane filtration unit.

[Problem] To provide a surface-treated copper foil which comprises a heat-resistant treated layer and a chromate-treated layer and does not comprise a roughening-treated layer. The surface-treated copper foil is suitable for a copper-clad laminated plate to be used for a printed wiring board compatible with high-speed transmission, because said surface-treated copper foil exhibits excellent heat resistance and rust prevention, and because the conductor loss due to different kinds of metals is small due to having a small adhesion amount of nickel and chromium on the treated surface and the conductor loss caused by roughening particles does not occur due to having low roughness. [Solution] A surface-treated copper foil wherein: the arithmetic average height Sa of the surface of an untreated copper foil is less than 0.27 μm; the developed interfacial area ratio Sdr is less than 6%; when the surface area ratio calculated from the Sdr is defined as A, and the nickel adhesion amount (mg) per two-dimensional area of 1 m2 of the treated surface of the surface-treated copper foil is defined as B, the nickel adhesion amount [B / A] per surface area of 1 m2 is 5-31 mg; and when the chromium adhesion amount (mg) per two-dimensional area of 1 m2 of the treated surface of the surface-treated copper foil is defined as C, the chromium adhesion amount [C / A] per surface area of 1 m2 is 1-4 mg.

The application discloses a ferritic stainless steel for a fuel cell bipolar plate, a surface roughness control method, a passivation film forming method and use. The ferritic stainless steel comprises C 0.03wt.% or less, N 0.02wt.% or less, Si 0.4wt.% or less, Mn 0.5wt.% or less, Cr 16-23wt.%, Cu 0-2.0wt.%, Mo 1.8-2.5wt.%, Ni 0.2-2.0wt.%, Ti 0.1-0.5wt.%, Nb 0.005-0.5wt.%, P 0.02wt.% or less, S 0.02wt.% or less, and the balance of Fe and other elements unavoidably contained, and the ferritic stainless steel has a grain size of 4-9 levels. The ferritic stainless steel has good corrosion resistance, electric conductivity, elongation and deformation capacity, and has economic and cost advantages.