59results 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.

A method for manufacturing a cover member for electronic devices according to certain embodiments of the present disclosure may comprise: a step for forming a magnesium plate; a step for performing primary CNC processing on the magnesium plate using a predetermined cutting oil; a step for performing a primary pretreatment on the magnesium plate using chromate or micro arc oxidation (MAO); a step for performing a primary surface-treatment on the magnesium plate by bake-coating or electrodeposition coating; a step for performing secondary CNC processing on a first region of the magnesium plate using an alcohol-containing cutting oil; a washing and drying step; a step for performing a secondary pretreatment for preventing oxidation on the first region; and a step for performing a secondary surface-treatment on the first region by bake-coating or electrodeposition coating.

To provide a method for manufacturing welded stainless steel in which a welded part has hydrogen barrier properties equivalent to those of a non-welded part.SOLUTION: A method for manufacturing welded stainless steel coated with a hydrogen barrier film comprises the steps of: machine-polishing a welded surface of welded stainless steel; electropolishing a surface of the stainless steel with an electropolishing solution composed of phosphoric acid and methanesulfonic acid; and forming a hydrogen barrier film on the electropolished stainless steel by means of the INCO method. An arithmetic mean height Sa (nm) according to ISO 25178-6 of the welded part of stainless steel after the electropolishing treatment step is 1.5 nm or less. The hydrogen barrier film has holes functioning as hydrogen trap sites of about 10 nm, which are not interconnected with each other. A hydrogen permeability of the welded stainless steel is from 2.0×10-14 to 3.5×10-14 mol / (m2 s Pa0.5).SELECTED DRAWING: Figure 2

There is provided a steel sheet 1 for cans having excellent corrosion resistance and excellent weldability. The steel sheet 1 for cans includes, on a surface of a steel sheet 2, two or more coating layers 3 and a chromium-containing layer 4 stacked in this order from a steel sheet 2 side. The chromium-containing layer 4 has a plurality of core-shell particles 5, the core-shell particles 5 are disposed on, of the coating layers 3, one layer adjacent to the chromium-containing layer 4, and each of the core-shell particles 5 has a core 5a of chromium metal or a chromium compound and a shell 5b of chromium oxide covering the core 5a.

Provided are a copper-clad laminate including an insulating layer containing a resin and a copper foil arranged on at least one surface of the insulating layer, wherein the copper foil is a surface-treated copper foil having a metal-treated layer containing zinc, and a content of zinc in the metal-treated layer is 10 to 2,500 μg / dm2; a method for producing the copper-clad laminate; and a printed wiring board and a semiconductor package using the copper-clad laminate.

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 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 provides a surface passivation method for a tin plate with extremely low tin content, and belongs to the field of tin plate production. Comprising the following steps: carrying out first electrochemical cathode treatment on the tinplate with extremely low tin content after softening treatment in a Ti-containing phosphating solution so as to form a first passivation film on the surface of at least one side of the tinplate with extremely low tin content; and performing second electrochemical cathode treatment on the extremely-low-tin-content tin-plated plate with the first passivation film in a Cr-containing passivation solution so as to form a second passivation film on at least part of the surface of the first passivation film. First electrochemical cathode treatment is carried out in a Ti-containing phosphating solution, so that the first electrochemical cathode treatment is combined with iron on the surface of a tin plate with extremely low tin content, a composite conversion film layer containing Ti, Fe and P is generated, and the situation that the corrosion resistance is affected by an iron leakage area on the surface of the tin plate is avoided; and secondly, chromate cathode passivation is conducted on the treated tin plate, a trivalent chromium passivation film is generated on the surface tin layer part, and therefore the corrosion resistance of the tin plate with the extremely low tin content is improved.

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.

The invention relates to the technical field of aluminum bronze, and discloses wear-resistant and corrosion-resistant aluminum bronze for a bearing and a preparation process of the wear-resistant and corrosion-resistant aluminum bronze. The preparation process comprises the following steps: S1, cutting an as-cast aluminum bronze alloy into an appropriate size, and sequentially carrying out surface pretreatment, surface blackening treatment and laser surface quenching on the surface of the as-cast aluminum bronze alloy to prepare a base layer aluminum bronze alloy; s2, the base layer aluminum bronze alloy is sequentially subjected to surface pretreatment and arc ion plating deposition, and a working layer aluminum bronze alloy is prepared; and S3, after laser etching and plasma activation are conducted on the surface of the working layer aluminum bronze alloy, the working layer aluminum bronze alloy is immersed in an organic / inorganic composite solution, vortexing is conducted for 10-15 min, room-temperature ultrasonic treatment is conducted for 15-20 min, then the working layer aluminum bronze alloy is placed at the room temperature for 15-20 min, the working layer aluminum bronze alloy is placed in the environment of 120-125 DEG C to be cured and subjected to ultrasonic cleaning, and the wear-resisting and corrosion-resisting aluminum bronze for the bearing

The invention provides a high-heat-resistance antioxidant liquid for a lithium battery copper foil, which comprises hexavalent chromium and an organic matter containing heteroatoms, and the heteroatoms comprise N, O, S or P.

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.

Provided is a steel sheet for cans that is excellent in adhesion, weldability, and corrosion resistance. The steel sheet for cans has, on the surface of the steel sheet, in order from the steel sheet side, a metallic chromium layer and a chromium hydrous oxide layer. The chromium hydrous oxide layer contains chromium element Cr and at least one element M selected from the group consisting of sodium, magnesium, potassium, and calcium. The molar ratio M / Cr of the element M to the chromium element Cr is 0.010 or more and 0.100 or less. The chromium hydrous oxide layer contains chromium hydroxide X, and the molar ratio X / Cr of the chromium hydroxide X to the chromium element Cr is 0.400 or more and 0.800 or less.

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.

The purpose of the present invention is to provide: a chromium-plated member which exhibits excellent corrosion resistance even if the upper layer is a trivalent chromium-plated layer, in particular, corrosion of copper or a copper alloy is suppressed, and which has a good appearance; and a manufacturing method which enables the production of such a chromium-plated member. This chromium-plated member is provided with: a base body having a surface layer comprising copper or a copper alloy; a first nickel plating layer formed in contact with the surface layer of the substrate; a second nickel plating layer formed on the first nickel plating layer in a contact manner; and a trivalent chromium plating layer formed on the second nickel plating layer in a contact manner, the chromium plating member being characterized in that the second nickel plating layer has an anode potential of-215 mV to-290 mV at a current density of 0.1 mA / cm2, and the first nickel plating layer has a potential lower than that of the second nickel plating layer by 15 mV to 150 mV.

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 purpose of the present invention is to provide: a chromium-plated component which exhibits excellent corrosion resistance even when the upper layer thereof is a trivalent chromium plating layer, in which corrosion of copper or a copper alloy in particular is suppressed, and which also has good appearance; and a production method that makes it possible to produce such a chromium-plated component. Provided is a chromium-plated component comprising a base that has a surface layer which comprises copper or a copper alloy, a first nickel plating layer formed on the surface layer of the base, a second nickel plating layer formed on the first nickel plating layer, and a trivalent chromium plating layer formed on the second nickel plating layer, said chromium-plated component being characterized in that the second nickel plating layer has an anode potential of -215 to -290 mV at a current density of 0.1 mA / cm2, and the first nickel plating layer has an electric potential 15-150 mV lower than the second nickel plating layer.

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.

The invention relates to a method for surface treatment of a formed sheet metal component (1). According to the invention, it is provided that - a surface of the sheet metal component (1) is provided with at least one laser engraving (L) and - the sheet metal component (1) is subsequently finished by means of anodizing. Furthermore, the invention relates to a device for surface treatment of a formed sheet metal component (1).

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.