摘要:
To a high-strength galvanized steel sheet and a relatively low-strength galvanized steel sheet that undergoes complex forming, a galvanized steel sheet that exhibits consistently excellent press formability and that generates no hazardous fumes during welding as well as a manufacturing method therefor are provided. A galvanized steel sheet has an oxide layer on the surface, where the oxide layer has an average thickness of 20 nm or more; and the oxide layer contains 30 mg/m 2 or more of Zn, 1.0 mg/m 2 or more of S, and 50 mg/m 2 or more and 1,000 mg/m 2 or less of polyethylene particles having an average particle size of 5.0 µm or less.
摘要:
The present invention provides a surface-treating solution composition, a zinc-based plated steel sheet surface-treated using same, and a method for producing same, wherein the surface-treating solution composition comprises: 10-20 wt% of a trivalent chromium compound including chromium phosphate (A) and chromium nitrate (B), the content ratio thereof, A/(A+B), satisfying 0.3-0.6; 20-40 wt% of a silane-based sol-gel resin in which three kinds of silane compounds are cross-linked; 0.2-0.4 wt% of an anti-rust corrosion resistant compound; 0.1-0.3 wt% of a molybdenum-based compound; 5-10 wt% of a water-soluble cationic urethane resin; 0.5-2.0 wt% of a silane coupling agent; 0.5-2.0 wt% of an Al compound; and 25.3-63.7 wt% of water. The zinc-based plated steel sheet treated with a surface-treating coating material containing trivalent chromium has excellent effects in terms of corrosion resistance, blackening resistance, fingerprint resistance, pipe-forming oil infiltration, and alkali resistance.
摘要:
A method for producing a galvanized steel sheet includes contacting a steel sheet with a zinc-containing aqueous solution having a zinc ion concentration of 1 to 100 g/l, contacting the steel sheet with an aqueous solution with a pH of 6 to 14, washing the steel sheet with water, and then drying the steel sheet. An example of the zinc-containing aqueous solution is a solution containing zinc sulfate. According to the method, an oxide layer which has an average thickness of 10 nm or more and which principally contains zinc is formed on the steel sheet and the galvanized steel sheet can be stably produced at high speed in a reduced space so as to have excellent press formability.
摘要:
Provided is a method for producing a galvanized steel sheet that exhibits a low sliding resistance during press forming, exhibits excellent degreasability even under stringent alkali degreasing conditions (low temperature and short line length conditions), suppresses dissolution of the oxide layer formed, is capable of suppressing occurrence of unevenness due to a washing treatment, and uses treatment solutions that do not have to contain substances of concern. A method for producing a galvanized steel sheet having an oxide layer on a surface includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains 0.1 g/L or more of carbonate ions.
摘要:
Provided are: a surface-treated metal sheet that is useful when integrating a molded plastic (resin) article and a metal sheet during injection molding; and a metal sheet-resin composite molded article in which the metal sheet and a resin molded article are integrated. The surface-treated metal sheet consists of a laminate having a metal substrate, a chemical conversion coating film and an adhesive layer in order, and is characterized in that the chemical conversion coating film contains colloidal silica and a thermosetting resin.
摘要:
Die Erfindung betrifft ein Verfahren zum Herstellen eines silanmodifizierten Silikats. Um optimale Korrosionssehutzeigenschaften zu erhalten, , ist vorgesehen, dass eine Silanverbindung in Gegenwart einer Silikatverbindung bei einem pH-Wert gleich oder größer 8 mindestens teilweise hydrolysiert und/oder kondensiert werden und anschließend ein pH-Werts gleich oder kleiner 7 durch Zugeben von Säure eingestellt wird. Die Erfindung umfasst weiter eine wässrige saure Passivierungszusammensetzung für metallische Substrate sowie ein mit der Passivierungszusammensetzung beschichtetes metallisches Substrat.
摘要:
A trivalent-chromium chemical conversion coating from which substantially no hexavalent chromium is released. The trivalent-chromium chemical conversion coating is one formed on the surface of a zinc or zinc-alloy deposit. In a brine spray test, the chemical conversion coating has unsusceptibility to corrosion (time required for white-rust formation) of 96 hours or longer. The chemical conversion coating has a hexavalent-chromium concentration less than 0.01 µg/cm 2 in terms of metal atom amount. The amount of hexavalent chromium released after 30-day standing in a thermo-hygrostatic chamber at a temperature of 80°C and a humidity of 95% (amount of hexavalent chromium released when the coating is immersed in 100°C water for 10 minutes) is smaller than 0.05 µg/cm 2 .