摘要:
In an acidic zinc sulfate and iron sulfate electro-galvanizing bath, of which a pH value has been adjusted to under 1.5, containing iron from 20 to 90 wt. % relative to the total amount of metals capable of being electro-deposited in said acidic electro-galvanizing bath, a steel sheet is subjected to an electro-galvanizing treatment, with an electric current having a current density of from 10 to 40 A/dm.sup.2 to form on said steel sheet an electro-galvanized layer in a weight of from 1 to 50 g/m.sup.2, containing iron from 5 to 35 wt. % relative to the total weight of the electro-galvanized layer.
摘要翻译:在其中将pH值调节至低于1.5的酸性硫酸锌和硫酸铁电镀浴中,含有20-90重量%的铁。 相对于能够在所述酸性电镀浴中电沉积的金属的总量的%,对钢板进行电镀锌处理,电流密度为10〜40A / dm 2 在所述钢板上形成重量为1至50g / m 2的电镀层,其中铁含量为5至35wt。 相对于电镀锌层的总重量。
摘要:
An electro-galvanized steel sheet for coating excellent in bare corrosion resistance, corrosion resistance after coating and formability, which comprises: a steel sheet; a first electro-galvanized layer, as a lower layer, in an amount of from 5 to 120 g/m.sup.2 per side, formed on at least one surface of said steel sheet, said first electro-galvanized layer comprising either an electro-galvanized layer consisting essentially of zinc or a compound electro-galvanized layer consisting essentially of zinc, cobalt and at least one of chromium, indium and zirconium; and a second electro-galvanized layer, as an upper layer, in an amount of from 0.2 to 10 g/m.sup.2 per side, formed on said first electro-galvanized layer, said second electro-galvanized layer consisting essentially of an alloy layer of zinc and from 1 to 60 wt. % iron. Said electro-galvanized steel sheet for coating is adapted to serve particularly for external, underside and closed structures of an automobile.
摘要翻译:一种用于在耐腐蚀性,涂布后的耐腐蚀性和成形性上涂覆的电镀锌钢板,其包括:钢板; 形成在所述钢板的至少一个表面上的每侧5〜120g / m 2的作为下层的第一电镀锌层,所述第一电镀层包括电镀锌层 基本上由锌或由锌,钴和铬,铟和锆中的至少一种组成的化合物电镀锌层组成; 以及形成在所述第一电镀锌层上的每面为0.2至10g / m 2的上层的第二电镀锌层,所述第二电镀锌层基本上由锌合金层组成 和1至60wt。 %铁。 所述用于涂覆的电镀锌钢板适用于特别用于汽车的外部,底部和封闭结构。
摘要:
In a process for manufacturing an electro-galvanized steel strip, which comprises: moving a steel strip in an acidic electro-galvanizing bath containing cobalt and chrominum in parallel with the plane of at least one anode plate to subject said steel strip to an electro-galvanizing treatment, thereby forming, on at least one surface of said steel strip, an electro-galvanized layer excellent in bare corrosion resistance and corrosion resistance after chromating; the improvement characterized by: keeping the cobalt content in said electro-galvanizing bath within the range of from 8 to 30 g/l, as converted into metallic cobalt, the chromium content in said electro-galvanizing bath within the range of from 0.1 to 1.5 g/l, as converted into metallic chromium, and the temperature of said electro-galvanizing bath within the range of from 35.degree. to 60.degree. C.; and, flowing said electro-galvanizing bath between said steel strip and said anode plate at a flow velocity of at least 0.35 m/sec in a direction at right angles to the travelling direction of said steel strip.
摘要:
A chromated electro-galvanized steel sheet is manufactured by electro-galvanizing a steel sheet in an acidic galvanizing bath containing zinc with or without specified amounts of cobalt, or with specified amounts of cobalt and with at least one of chromium (Cr.sup.+3, Cr.sup.+6 or Cr.sup.+3 and Cr.sup.+6) and zirconium; then electro-galvanizing in a zinc-based galvanizing bath containing specified amounts of at least one of chromium (Cr.sup.+3, Cr.sup.+6 or Cr.sup.+3 and Cr.sup.+6), tin and indium; and chromating the resulting steel sheet.
摘要:
In a Zn-ion based acidic galvanizing bath containing at least one additive selected from the group consisting of:______________________________________ (a) Cr.sup.3.sup.+ 50 - 700 ppm, (b) Cr.sup.6.sup.+ 50 - 500 ppm, (c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+ 50 - 700 ppm, in which Cr.sup.6.sup.+ being 500 ppm at the maximum, (d) In ion 10 - 3,000 ppm, and (e) Zr ion 10 - 2,500 ppm; and: (f) Co ion 50 - 10,000 ppm, ______________________________________ A steel sheet is subjected to an electro-galvanizing treatment to form a first galvanizing layer on the surface thereof; and then, said electro-galvanized steel sheet with said first galvanizing layer formed thereon to a conventional chromate treatment.With a view to further increasing the amount of deposited chromate on said chromated electro-galvanized steel sheet, said electro-galvanized steel sheet with said first galvanizing layer formed thereon is subjected to another electro-galvanizing treatment in a conventional acidic galvanizing bath containing zinc only to form a second galvanizing layer consisting exclusively of at least 0.2 g/m.sup.2 zinc on said first galvanizing layer; and then, said electro-galvanized steel sheet with said first and said second galvanizing layers formed thereon is subjected to a conventional chromate treatment.
摘要:
In a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of:______________________________________ (a) Cr.sup.3.sup.+ 50 - 700ppm, (b) Cr.sup.6.sup.+ 50 - 500ppm, and (c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+ 50 - 700 ppm, in which Cr.sup.6.sup.+ being 500ppm at the maximum; ______________________________________ And at least one additive selected from the group consisting of:______________________________________ (d) Sn ion 10 - 5,000ppm, and (e) In ion 10 - 3,000ppm, ______________________________________ A steel sheet is subjected to an electro-galvanizing treatment, and then, said electro-galvanized steel sheet is subjected to a conventional chromate treatment.
摘要:
An iron-zinc alloy electro-galvanized steel sheet having a plurality of iron-zinc alloy coatings, which comprises: at least one iron-zinc alloy coating as the lower layer, formed on the surface of a steel sheet, and at least two iron-zinc alloy coatings as the upper layer, formed on the at least one iron-zinc alloy coating as the lower layer. The ratio of iron content to the coating weight of each of the at least one iron-zinc alloy coating as the lower layer is within the range of from 1 to 15 wt. %, and the total coating weight of the at least one iron-zinc alloy coating as the lower layer is within the range of from 1 to 50 g/m.sup.2 per side of the steel sheet. The ratio of iron content to the coating weight of each of the at least two iron-zinc alloy coatings as the upper layer is over 15 wt. %, the ratio of iron content to the coating weight gradually increases from the innermost coating toward the outermost coating of the at least two iron-zinc alloy coatings as the upper layer, the difference in the ratio or iron content to the coating weight between two adjacent coatings of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 1 to 15 wt. %, and the total coating weight of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 1 to 40 g/m.sup.2 per side of the steel sheet. The difference in the ratio of iron content to the coating weight between the uppermost coating of the at least one iron-zinc alloy coating as the lower layer and the lowermost coating of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 1 to 15 wt. %. The sum of the total coating weight of the at least one iron-zinc alloy coating as the lower layer and the total coating weight of the at least two iron-zinc alloy coatings as the upper layer is within the range of from 10 to 75 wt. % per side of the steel sheet.
摘要:
A strip horizontally travels within an electroplating apparatus while the plating solution is applied between the strip and anode, in which relative speed of the solution to the strip and/or current density are varied, whereby an outer plated layer on the strip is provided with Fe-Zn alloy of high Fe content while an inner plated layer on the strip is provided with Fe-Zn alloy of low Fe content.
摘要:
The invention provides a method for producing a coated steel sheet for a can. A film of aluminum, aluminum alloy, titanium or titanium alloy 0.005 to 5 .mu.m thick is plated on one surface of a steel sheet by means of a dry process. A metal film is also plated on the other surface of the steel sheet by means of a dry process.
摘要:
A composite zinc-silica electro-galvanized steel sheet excellent in corrosion resistance, having on at least one surface thereof a zinciferous plating layer, preferably in an amount of from 5 to 100 g/m.sup.2 per side thereof, into which silica particles are dispersed. The above-mentioned plating layer consists essentially of:silica particles: from 0.1 to 20 wt. %,nitrogen compounds: from 0.0005 to 0.5 wt. % as converted into nitrogen,and the balance being zinc and incidental impurities.The above-mentioned plating layer further additionally contains as required at least one element selected from the group consisting of:iron: from 2 to 80 wt. %,nickel: from 2 to 25 wt. %,cobalt: from 0.1 to 5 wt. %, andchromium: from 0.5 to 20 wt. %.The total amount of the above-mentioned at least one element thus additionally contained is limited to up to 80 wt. %.