31results about "Chromatisation" patented technology

The invention belongs to the technical field of tin plating materials, and relates to a tin plating plate with high sulfur resistance and a preparation method and application thereof. The tin-plated plate with high sulfur resistance comprises a first passivation layer, a first tin-plated layer, a first multi-component alloy layer, a tin-plated substrate layer, a second multi-component alloy layer, a second tin-plated layer and a second passivation layer which are arranged in sequence, the surface, away from the first tin plating layer, of the first passivation layer is an inner coating surface; the surface, away from the second tin plating layer, of the second passivation layer is an outer coating surface; the arithmetic mean roughness of the inner coating surface is 0.4-0.5 [mu] m, the profile skewness is 0-0.3, and the profile kurtosis is 2.5-3; the arithmetic mean roughness of the outer coating surface is 0.6-0.7 [mu] m, the profile skewness is 0-0.3, and the profile kurtosis is 2.5-3; the first multi-component alloy layer and the second multi-component alloy layer respectively and independently comprise gallium; according to the tin plate with the high sulfur resistance, the binding force between the film layers is high, and the deformation resistance and the sulfur resistance of the film layers are excellent.

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 is a steel sheet (1) for cans, which has excellent coating adhesion and surface appearance. A steel sheet (1) for cans, wherein a chromium metal layer (3) and a chromium hydrate oxide layer (4) are provided on the surface of a steel sheet (2) in this order from the steel sheet (2) side. The deposition amount of the chromium metal layer (3) is 50-200 mg / m2, and the deposition amount of the chromium hydrate oxide layer (4) in terms of chromium is 3-50 mg / m2. The chromium metal layer (3) includes a flat plate portion (3a) and a protruding portion (3b) provided on the flat plate portion (3a). The minimum value of the generated size of the protrusions (3b) is-500 nm or more. The number of protrusions having an extinction size of 0 nm or more but less than 750 nm is 1.0-10.0 / [mu] m2, and the number of protrusions having an extinction size of 750 nm or more is 0.02 / [mu] m2 or more. The generation size and the extinction size of the protrusions are obtained by creating a zero-order persistence map for the protrusions.

To provide a copper foil, a current collector for a lithium ion secondary battery, and a lithium ion secondary battery.SOLUTION: The present disclosure provides a copper foil containing 2 ppm to 21 ppm of silver, 0.5 ppm to 5.5 ppm of titanium, and 2 ppm to 80 ppm of sulfur, the copper foil having an orientation index of (220) plane of 2.05 to 3.08.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 invention discloses a process for plating high-strength structural steel with a low-hydrogen brittleness zinc-nickel alloy and a plating structure. The process comprises the steps that cobalt-titanium alloy plating, zinc-nickel alloy plating and hexavalent chromium passivation are sequentially carried out on a high-strength structural steel matrix. The cobalt-titanium alloy plating process comprises the following components and parameters: 160-200 g / L of cobalt sulfate heptahydrate, 8-12 g / L of potassium fluotitanate, 2-8 g / L of sodium fluoride, 80-120 g / L of sodium sulfate, 30-50 g / L of sodium hydrogen succinate, 8-12 mL / L of a walking agent and 1-3 mL / L of a wetting agent, the pH value of a plating solution is 3.8-4.4, the temperature of a plating tank is 20-35 DEG C, the cathode current density is 1-2 A / dm < 2 >, and the cathode movement is 4-6 m / min. The hydrogen brittleness test is carried out according to HB 5067.1-2005 Part 1 of Hydrogen brittleness Test of Plating Process: Mechanical Method, and the test result meets the standard requirement. According to the technical scheme, the problem that high-strength structural steel galvanized nickel alloy is prone to hydrogen brittleness is solved.

Provided is surface-treated titanium copper foil and a titanium copper-clad laminate with which it is possible to form a circuit pattern that excels in adhesion to a resin base material. Surface-treated titanium copper foil 1 has: titanium copper foil 2; and a surface-treated layer 3 formed on at least one surface of the titanium copper foil 2. The surface-treated layer 3 contains Cr and Zn.

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.

To provide highly heat-resistant antioxidant liquid for a lithium battery copper foil capable of solving cost increase and a sewage treatment problem while effectively improving heat-resistant temperature.SOLUTION: Antioxidant liquid for a lithium battery copper foil contains hexavalent chromium and a heteroatom-containing organic substance in which a heteroatom contains N, O, S or P.SELECTED DRAWING: Figure 1

Provided is a surface-treated steel sheet which can be manufactured without using hexavalent chromium and which has excellent corrosion resistance to a BPA-free coated portion. This surface-treated steel sheet is provided with a steel sheet and a chromium-containing layer disposed on at least one surface of the steel sheet, and is characterized in that an oxygen-rich region containing 10% or more of O in terms of atomic concentration exists in the vicinity of the interface between the steel sheet and the chromium-containing layer, and the vicinity is a region in which the atomic ratio of Fe to Cr is in the range of 0.7-1.3.

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.

Provided is a surface-treated steel sheet that can be produced without using hexavalent chromium and that also has excellent corrosion resistance in a BPA-free coated part. The surface-treated steel sheet includes a steel sheet and a chromium-containing layer disposed on at least one surface of the steel sheet. An oxygen-enriched region containing O at an atomic concentration of 10 % or more is present in a vicinity of an interface between the steel sheet and the chromium-containing layer, and the vicinity is a region in which an atomic ratio of Fe to Cr is in a range of 0.7 to 1.3.

To provide a copper foil, a current collector for a lithium ion secondary battery, and a lithium ion secondary battery.SOLUTION: The present disclosure provides a copper foil containing 5 ppm to 25 ppm of silver, 0.5 ppm to 8 ppm of titanium, and 5 ppm to 85 ppm of sulfur.SELECTED DRAWING: None

Provided is a steel sheet (1) for cans, which has excellent coating adhesion and surface appearance. A steel sheet (1) for cans, wherein a chromium metal layer (3) and a chromium hydrate oxide layer (4) are provided on the surface of a steel sheet (2) in this order from the steel sheet (2) side. The deposition amount of the chromium metal layer (3) is 50-200 mg / m2, and the deposition amount of the chromium hydrate oxide layer (4) in terms of chromium is 3-50 mg / m2. The chromium metal layer (3) includes a flat plate portion (3a) and a protruding portion (3b) provided on the flat plate portion (3a). The maximum equivalent circle diameter of the protrusions (3b) is 1000 nm or less. The average area of a Voronoi polygon obtained by performing Voronoi division on the center of gravity of the protrusion (3b) is 5000-200000 nm < 2 >. When DAVE is the simple average, D50 is the diameter of 50% of the cumulative distribution, and D90 is the diameter of 90% of the cumulative distribution, D50 / DAVE is less than 1.00, and D90 / DAVE is less than 3.00.

[Problem] To further improve corrosion resistance after molding. [Solution] A surface-treated steel sheet according to the present invention has: a plating layer that is positioned on at least one surface of a steel sheet and contains zinc and nickel; and a coating film which is positioned on the plating layer and contains at least an epoxy resin and an isocyanate resin, and which, when viewed in a cross-section cut in the thickness direction after the tensile elongation of 10% is imparted, has a thickness of 60 [mu] m in a region having a length of 60 [mu] m in a direction orthogonal to the thickness direction. The ratio of the total length of cracks generated in the coating film to the total length of cracks generated in the plating layer is 80% or less.

Provided is a surface-treated steel sheet that can be produced without using hexavalent chromium and has excellent corrosion resistance at BPA-free painted worked part. A surface-treated steel sheet comprises: a steel sheet; and a chromium-containing layer disposed on a surface of the steel sheet on at least one side, wherein when the chromium-containing layer is observed from a surface direction, linear regions in which an element smaller in atomic number than chromium is concentrated are present, and the number of the linear regions is 5.0 or more per 100 nm.

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.

The present invention proposes a surface-treated copper foil for high frequency circuits and a corresponding method for treating the copper foil. The copper foil (12) comprises two opposite faces (12.1, 12.2), in which the first face (12.2) is coated with a treatment layer (14) comprising, in this order: a first layer (16) comprising oxides of Mo and Zn, deposited on said first face (12.2), said first layer being free of Ni; a second layer (18) of Cr oxide; and a binder layer (20); the first layer (16) comprises between 5 and 30 mg / m2 calculated as Mo and Zn. 2 the treated layer (14) has a roughness RzJIS of 0.7 μm or less; and the first surface is not subjected to a roughening treatment.

The present invention provides a steel sheet for a can having excellent weldability and slidability and a method for manufacturing the same. The steel sheet for a can has, in order from the steel sheet side, a metallic chromium layer and a chromium hydrate oxide layer on the surface of the steel sheet, the adhesion amount of the metallic chromium layer is 50 to 150 mg / m 2 , the adhesion amount of the chromium hydrate oxide layer in terms of chromium is 3 to 15 mg / m 2 , the metallic chromium layer includes flat plate-shaped bases and granular projections provided on the bases, the average particle diameter D1 of the granular projections is 20 to 200 nm, and the number density of the granular projections is 10 / μm 2 , and the chromium hydrate oxide layer contains silicon dioxide, the content of the silicon dioxide in the chromium hydrate oxide layer is 0.1 to 45 mg / m 2 in terms of SiO2.

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

Provided is a surface-treated steel sheet that can be produced without using hexavalent chromium and has excellent corrosion resistance at BPA-free painted worked part. A surface-treated steel sheet comprises: a steel sheet; and a chromium-containing layer disposed on a surface of the steel sheet on at least one side, wherein when the chromium-containing layer is observed from a surface direction, linear regions in which an element smaller in atomic number than chromium is concentrated are present, and the number of the linear regions is 5.0 or more per 100 nm.

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.

[Problem] To further improve adhesion and corrosion resistance of a coating film after forming processing. [Solution] The surface-treated steel sheet of the present invention has: a plated layer on at least one surface of a steel sheet, and containing zinc and nickel; a first composite layer between the steel sheet and the plated layer, and containing Fe, Zn, and Ni; a chromium-containing composite layer on the plated layer, and containing at least Cr; and a coating film on the chromium-containing composite layer, and containing an epoxy resin, an isocyanate resin, and silica particles, the plated layer having an attached amount of 2 to 50 g / m 2 2 per one side, the chromium-containing composite layer including: a second composite layer on the plated layer side, and containing Cr, Zn, and Ni; and a third composite layer on the coating film side, and containing Si, N, and Cr, the chromium-containing composite layer having an attached amount of 10 to 200 mg / m 2 2 in terms of metal Cr, the coating film having a thickness of 0.5 to 2.0 µm.

The invention provides an anodic oxidation method of a ZL104 aluminum alloy. The anodic oxidation method comprises the following steps: carrying out chemical oil removal on the ZL104 aluminum alloy by utilizing a chemical oil removal solution; carrying out alkali washing on the ZL104 aluminum alloy by utilizing the etching solution; ash removal is conducted on the ZL104 aluminum alloy through the ash removal solution; the ZL104 aluminum alloy is subjected to anodic oxidation through the anodic oxidation solution; sealing the anodic oxide film layer by using a sealing solution; the anodic oxidation solution comprises the following components: 50-60 g / L of sulfuric acid, 5-11 g / L of boric acid, less than 20 g / L of Al < 3 + > and the balance of water. The boric sulfuric acid anodic oxidation process is adopted to replace a chromic acid anodic oxidation process, the concentration of Al < 3 + > is controlled, and it is ensured that the performance of the film layer prepared through anodic oxidation meets the requirements.