摘要:
The coated steel sheet includes a zinc phosphate coating containing Mg on a surface of a galvanized steel sheet, and an orthophosphoric acid ester-containing coating on a surface of the zinc phosphate coating. The coated steel sheet has no coating fall-off even during a chemical conversion treatment step of an automobile producing line and has excellent perforative corrosion resistance either with no-painting or after electrodeposition painting, chemical conversion treatability and press formability.
摘要:
A galvanized steel sheet includes a galvanized coating layer having a coating weight of from about 20 to about 60 g/m2 formed on at least one surface of the steel sheet, and a zinc phosphate coating layer having a coating weight of from about 0.5 to about 3.0 g/m2 formed on the galvanized coating layer. The zinc phosphate coating layer contains from about 0.5 to about 10.0 percent by weight of magnesium, from about 0.1 to about 2.0 percent by weight of nickel, and from about 0.5 to about 8.0 percent by weight of manganese. However, the manganese content and the nickel content satisfy the following relationship: [Ni]×7.6−10.9≦[Mn]≦[Ni]×11.4 wherein [Mn] represents the manganese content, in percent by weight, and [Ni] represents the nickel content, in percent by weight. This steel sheet exhibits superior perforative corrosion resistance. The steel sheet also exhibits superior press workability by further controlling the magnesium, nickel, and manganese contents.
摘要:
The invention provides a material coated with an organic film which exhibits excellent corrosion resistance and lacquer adhesion. The invention includes an electroconductive substrate coated with an electrolytically polymerized coating film containing chromium. Particularly, a zinc-type plated steel sheet coated with an electrolytically polymerized coating film containing chromium in accordance with the invention is well suited for application in vehicle bodies. The invention further provides a method of making a material coated with an organic film which involves forming organic coating material containing chromium on an electroconductive substrate acting as an electrode by electrolytically polymerizing an organic monomer in an electrolyte solution containing chromium. The method provides a monolithic composite structure comprising chromium compounds and an organic coating film, and avoid the problems associated with passivation after chromium plating of steel. The method of the invention can also reduce processing by two-thirds in relation to conventional methods.
摘要:
A surface treated tin-plated steel sheet which has an alloy layer formed on the surface of a steel sheet, a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 30% or more of that of the alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, a coating film containing P and Si in an amount of 0.5 to 100 mg/m2 and 0.1 to 250 mg/m2, respectively; and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.
摘要翻译:一种表面处理的镀锡钢板,其具有形成在钢板表面上的合金层,镀锡层形成在所述合金层上,剩余的合金层的暴露部分的面积为30%以上的面积 在合金层的所述锡镀层和所述暴露部分上形成含有0.5〜100mg / m 2和0.1〜250mg / m 2的P和Si的涂膜, 以及用于制备含有磷酸根离子,锡离子和硅烷偶联剂的钢板的化学处理溶液,其pH为1.5〜5.5。 经表面处理的镀锡钢板不含铬,从环境角度出现问题,并且与涂料的粘合性优异,涂布后的耐腐蚀性,耐锈性和成形性也优异。
摘要:
An organic film-coated plated steel sheet is disclosed which includes a base steel sheet, a zinc-base plated layer disposed thereon, and an organic film layer formed by cathodic polymerization of one or more monomers and superposed as an outermost layer on the zinc-base plated layer. The steel is excellent in corrosion resistance, weldability, electrodeposition paintability or paint adhesion and, thus, is suitable as a rust-proof steel sheet particularly for use in automobile bodies. Also disclosed is a process for producing that steel with less production equipment and reduced cost.
摘要:
Surface-treated steel strips suitable for electric resistance welding are prepared by forming a first layer of iron-nickel alloy on a steel strip, said first layer having a weight ratio of Ni/(Fe+Ni) in the range between 0.02 and 0.50 and a thickness of 10 to 5,000 angstroms, forming a second layer of tin or iron-tin-nickel alloy on said first layer by tin plating to a coating weight of 0.1 to 1 g/m.sup.2 of tin and optionally, causing the tin to reflow, and forming a third layer on said second layer by effecting an electrolytic chromate treatment, said third layer consisting essentially of metallic chromium and hydrated chromium oxide in a total amount of 5 to 20 mg/m.sup.2 calculated as elemental chromium. More preferably, the electrolytic chromate treatment is controlled such that at least 2 mg/m.sup.2 of metallic chromium is present in the third layer.
摘要:
A process for the manufacture of tinplates comprising electroplating a substrate in a fused-chloride tin plating bath at a temperature of about 150.degree. to 350.degree. C., a current density of about 100 to 500 A/dm.sup.2 in an atmosphere of a non-oxidizing gas. This process may be converted to a process for the manufacture of reflow type tinplates by only changing the bath temperature, and vice versa. For the manufacture of no-reflow type tinplates, the bath is kept at 150.degree. to 232.degree. C., while for the manufacture of reflow type tinplates, the bath is kept at 233.degree. to 350.degree. C. In these cases, the bath includes SnCl.sub.2 and at least one member selected from the group consisting of KCl, NaCl, LiCl and AlCl.sub.3, and may preferably be operated while flowing the bath at a flow rate of about 0.1 m/sec higher. There is provided equipment for the manufacture of tin-plated steel strip comprising a pretreating apparatus for cold rolling steel strip, an annealing apparatus, a skin pass rolling apparatus, a fused-salt tin-electroplating apparatus with the above bath including chlorides, and an aftertreating apparatus, these apparatus being continuously integrated into the equipment by use of a fused-salt bath.
摘要:
A plated steel sheet is produced by an electroplating in a plating bath of about 350.degree. to 500.degree. C. containing a chloride of Zn, a chloride of Mg and one, two or more of chlorides of Na, K and Li, with a plating current density ranging between about 20 and 350 A/dm.sup.2.The Zn-Mg alloy plated steel sheet superior both in plating adhesion and corrosion resistance has a plating layer formed on at least one surface thereof in an amount of about 10 to 60 g/m.sup.2, and by electroplating in a bath of a fused salts, the plating layer containing about 1 to 35 wt % of Mg, about 0.5 to 25 wt % of mean value of Fe and the balance substantially Zn and incidental inclusions. The Fe content in the plating layer has such a gradient that its concentration is greatest at the interface between the plating layer and the steel sheet and progressively decreases towards the surface of the plating layer opposite to the steel sheet where the Fe content is substantially zero. The plated steel sheet may further have a chromate treatment layer formed on the plating layer, with or without an organic coating film formed on the chromate treatment layer.
摘要:
Surface-treated steel strips suitable for electric resistance welding are prepared by forming a first layer of iron-nickel alloy on a steel strip, this first layer having a weight ratio of Ni/(Fe+Ni) in the range between 0.02 and 0.50 and a thickness of 10 to 5,000 angstroms, forming a second layer of tin or iron-tin-nickel alloy on the first layer by tin plating to a coating weight of 0.1 to 1 g/m.sup.2 of tin and optionally, causing the tin to reflow. A third layer is formed on the second layer by effecting an electrolytic chromate treatment, this third layer consisting essentially of metallic chromium and hydrated chromium oxide in a total amount of 5 to 20 mg/m.sup.2 calculated as elemental chromium. Preferably, the electrolytic chromate treatment is controlled so that at least 2 mg/m.sup.2 of metallic chromium is present in the third layer.
摘要:
A coated steel sheet composed of a steel sheet and at least two types of coating layers formed thereon is provided with an electrodeposition painting having a superior appearance. The coated steel sheet has an arithmetic mean roughness Ra, which is defined by JIS B 0601-1994, of from about 0.7 to about 1.5 μm and a peak per inch PPI of from about 180 to about 250.
摘要翻译:由钢板和形成在其上的至少两种涂层组成的涂层钢板设置有具有优异外观的电沉积涂漆。 涂覆钢板具有由JIS B 0601-94定义的算术平均粗糙度Ra为约0.7至约1.5μm,峰值/英寸PPI为约180至约250。