摘要:
The improved organic composite coated steel plate includes a zinc or zinc alloy plated steel plate as a substrate that has on its surface a chromate film the Cr.sup.6+ content of which is no more than 70% of the total Cr content and which is deposited in an amount of 5-500 mg/m.sup.2 in terms of metallic chromium, the chromate film being overlaid with a resin layer that is deposited in an amount of 0.1-3 g/m.sup.2 on a dry weight basis and which is formed primarily of water-dispersed silica and one organic resin member as selected from the group consisting of an anionic aqueous resin, a nonionic aqueous resin and an anionic aqueous urethane resin. This steel plate is adapted for not contaminating the environment of the earth in the process of its manufacture.
摘要翻译:改进的有机复合涂层钢板包括锌或锌合金镀覆钢板作为基材,其表面上具有Cr6 +含量不超过总Cr含量的70%并以一定量沉积的铬酸盐膜 以金属铬计为5-500mg / m 2,铬酸盐膜覆盖有以干重计为0.1-3g / m 2的量沉积的树脂层,主要由水分散二氧化硅 和一种选自阴离子水性树脂,非离子水性树脂和阴离子水性聚氨酯树脂的有机树脂构件。 该钢板适用于在制造过程中不污染地球的环境。
摘要:
An organic composite coated steel strip having well-balanced corrosion resistance, coating properties including adaptability to electrophoretic coating and water resistant secondary coating adherence, and spot weldability is provided. The organic composite coated strip comprises a zinc or zinc base alloy plated steel substrate; a chromate later on the substrate containing up to 70% by weight of Cr.sup.6+ based on the total chromium quantity, the chromate layer being coated in a weight of 5 to 500 mg/m.sup.2 in terms of elemental chromium; and an organic composite layer on the chromate layer mainly comprising silica and an organic high molecular weight resin. In the organic composite coated steel strip, (a) silica has an average primary particle diameter of 5 to 30 nm; (b) silica is agglomerated into agglomerates of an average thickness of 0.2 to 2 .mu.m and an average apparent diameter of 5 to 300 .mu.m; and (c) the organic composite layer has been coated to a dry weight of 0.1 to 3 g/m.sup.2. The organic composite coated steel strip of the invention has various uses including automobile bodies.
摘要翻译:提供了具有良好平衡的耐腐蚀性,包括对电泳涂层的适应性和耐水二次涂层粘附性的涂层性能和点焊性的有机复合涂层钢带。 有机复合涂层带材包括锌或锌基合金镀钢基材; 铬酸盐层以基于铬的总铬含量高达70重量%的Cr 6+,铬酸盐层以元素铬计为5至500mg / m 2的重量; 以及主要包含二氧化硅和有机高分子量树脂的铬酸盐层上的有机复合层。 在有机复合涂层钢带中,(a)二氧化硅的平均一次粒径为5〜30nm; (b)将二氧化硅凝聚成平均厚度为0.2〜2μm,平均视野直径为5〜300μm的团块; 和(c)有机复合层已被涂覆至干燥重量为0.1至3g / m 2。 本发明的有机复合涂层钢带具有各种用途,包括汽车车身。
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 zinc or zinc-alloy plated steel sheet having an improved weldability and plating properties, as well as a method for making the same is provided. Even when the substrate steel sheet is the one which is difficult to deposit a zinc or zinc-alloy layer by conventional methods, such as an extra low carbon steel sheet, the present invention enable a reliable production of a galvanized steel sheet suffering from no plating failure or insufficient adhesion as well as a reliable production of a galvannealed steel sheet suffering from no plating failure or streaking of the alloyed layer.The zinc or zinc-alloy plated steel sheet having improved weldability comprises an extra low carbon steel sheet, an iron-carbon plated layer or a carbon-rich layer generated by diffusion of the iron-carbon plated layer on at least one major surface of the extra low carbon steel sheet, and a zinc or zinc-alloy plated layer on the iron-carbon plated layer or the carbon-rich layer.The zinc or zinc-alloy plated steel sheet having improved weldability and/or plating properties is produced by depositing on the steel sheet an iron-carbon plated layer having a carbon content of from 0.01% by weight to 10% by weight to a coating weight of from 0 01 g/m.sup.2 to 10 g/m.sup.2, optionally annealing the iron-carbon plated steel sheet, and depositing a zinc or zinc-alloy plated layer, preferably by galvanizing or galvannealing, on the annealed steel sheet.
摘要翻译:提供具有改进的焊接性和电镀性能的锌或锌合金镀覆钢板及其制造方法。 即使基板钢板是通过常规方法难以沉积锌或锌合金层的钢板,例如超低碳钢板,本发明能够可靠地生产没有电镀的镀锌钢板 失效或不充分的粘合性,以及可靠地生产没有电镀失效或合金化层的条纹的合金化热镀锌钢板。 具有改善的焊接性的锌或锌合金镀覆钢板包括通过铁碳镀层在至少一个主表面上扩散而产生的超低碳钢板,铁碳镀层或富碳层 铁碳镀层或富碳层上的锌或锌合金镀层。 通过在碳钢板上沉积碳含量为0.01重量%〜10重量%的铁碳镀层,涂布量为1重量%以上,制成具有改善的焊接性和/或电镀性能的锌或锌合金镀覆钢板 为0.01g / m 2至10g / m 2,可选择地对含铁碳素钢板进行退火,并且优选通过镀锌或合金化退火将锌或锌合金镀层沉积在退火钢板上。
摘要:
A method of guiding and transferring a rapidly quenched metallic tape includes steps of peeling the rapidly quenched metallic tape produced by solidification through rapid quenching on a circumferential surface of a single cooling roll rotating at a high speed, introducing the metallic tape into a cylindrical transfer guide to a pinch roll unit arranged at a terminal end of the transfer guide to catch the metallic tape by the pinch roll unit, and moving the pinch roll unit to a winder for the metal tape. The metallic tape is fed in the transfer guide substantially without being in contact with the transfer guide. An apparatus for guiding and transferring a rapidly quenched metallic tape includes a cylindrical transfer guide arranged on a normal line of a single cooling roll for introducing and guiding the metallic tape, a pinch roll unit arranged at a terminal end of the transfer guide for catching the metallic tape, and a transfer trolley for transferring the pinch roll unit to a winder for the metallic tape.
摘要:
Zn--Cr alloy plated steel sheets have excellent corrosion resistance. It has now been found that the phase structures of Zn--Cr alloy platings are such that they comprise yet to be known phases .eta.x, .delta.x and .GAMMA.x. Furthermore, these phases when taken either singly or with two or more phases being mixed together, exhibit the following characteristics (1)-(6). The characteristics of the respective phases are also identified below.______________________________________(1) .eta.x Resistance to cosmetic corrosion(2) .GAMMA.x Formability(3) .eta.x + .delta.x Chipping resistance(4) .eta.x + .GAMMA.x Corrosion resistance in the as-formed state(5) .delta.x + .GAMMA.x Water resistant secondary adherence of coating(6) .eta.x + .delta.x + .GAMMA.x Perforation corrosion resistance.eta.x: Hexagonal crystal a = 2.66-2.74 .ANG. c = 4.61-4.95 .ANG..delta.x: Hexagonal crystal a = 2.72-2.78 .ANG. c = 4.43-4.60 .ANG..GAMMA.x: Cubic crystal a = 3.00-3.06 .ANG.______________________________________
摘要:
The invention provides an aluminum alloy sheet having improved formability, an elongation of at least 30%, a sliding frictional resistance of up to 0.13 and minimized surface pressure dependency of sliding frictional resistance, comprising an aluminum alloy substrate containing at least 4 wt % of Mg and a Fe rich plating layer on a surface thereof in a coating weight of 1 to 50 g/m.sup.2. Also provided is a bake hardenable, surface treated aluminum alloy sheet having improved formability, an elongation of at least 25%, a sliding frictional resistance of up to 0.13 and minimized surface pressure dependency of sliding frictional resistance, comprising a bake hardenable aluminum alloy substrate containing Mg and Si in an amount of at least 0.4 wt % calculated as Mg.sub.2 Si and a Fe rich plating layer on a surface thereof in coating weight of 1 to 50 g/m.sup.2. By forming a zincate layer as an undercoat below the Fe rich plating layer, the plating adhesion is further improved. The preferred Fe rich plating layer is a Fe-Zn alloy plating layer containing 20 to 80 wt % of Zn for corrosion resistance improvement. A Fe-Zn alloy plating layer containing 30 to 40 wt % of Zn meets both formability and corrosion resistance.
摘要:
The present invention provides a method of producing a zinc-chromium alloy-plated steel sheet having excellent properties such as bare corrosion resistance, corrosion resistance after coating, plating adhesiveness and weldability.The method is characterized by plating the surface of the steel sheet using an acid plating bath containing zinc ion (Zn.sup.2+) and chromium ion (Cr.sup.3+) at a molar concentration ratio of about 0.1.ltoreq.Cr.sup.3+ /(Zn.sup.3+ +Cr.sup.3+).ltoreq.0.9 in a total amount of at least about 0.5 mol/1 within the dissolution range, and about 0.1 to 30 g/1 of at least one nonionic organic additive having at least a triple bond, at a bath temperature of about 25.degree. to 70.degree. C. and a pH of about 1.0 to 4.0 with a current density of about 50 to 200 A/dm.sup.2.
摘要:
An apparatus for transferring a rapidly quenched metallic tape, which is produced by solidification through rapid quenching on a circumferential surface of a single cooling roll rotating at a high speed, from the cooling roll into a winder, comprises a transfer means provided with a pinch roll unit for catching and feeding out the peeled metallic tape, a fan for breaking and discharging the metallic tape fed out from the pinch roll unit, and a dust device for recovering metallic pieces and powder generated in the breakage of the metallic tape by the fan.
摘要:
Cooling rolls which receive a falling stream of a metal melt, and rapidly cooling and solidifying it. Each of the cooling rolls comprises a roll base body and a sleeve which is fitted around a barrel periphery of the roll base body and forms a cooling water flow path between the roll base body and the sleeve. The sleeve is only partially tightly fixed to the roll base body. End portions of the sleeve are joined to the roll base body in such a soft structure that movement of the sleeve in the roll axial direction due to the thermal expansion is not interrupted at end portions of the sleeve.