摘要:
In a process and plant for pickling steel strip, a highly refined steel strip is delivered in the form of a coil, uncoiled by an uncoiling hasp 1 and advanced through at least one predescaling plant 3, pickling sections and a rinsing plant 7 to a recoiling hasp 9 or a transverse cutting plant. The strip is clamped to the recoiling hasp 9 ,--,--; recoiled and drawn solely thereby or in conjunction with other driven treatment rolls through the treatment plant or is cut into sheets by the transverse cutting plant. The plant comprises at least one elongated, preferably shallow pickling vat having a supporting structure of steel, glass fibre reinforced synthetic resin or polypropylene and a lining of acid and abrasion resistant material including PVC, carbon bricks, graphite filled and/or aluminium oxide filled polyester resin.
摘要:
Process for pickling high-grade steel, preferably high-grade steel hot strip, the high-grade steel being subjected to pickling with neutral electrolyte as well as to an after-treatment with mixed acid, nitric acid or a mixture of iron fluoride and hydrofluoric acid, the pickling with neutral electrolyte being preceded by a pre-treatment with sulfuric acid.
摘要:
The invention describes a process for the electrolytical coating of an object of steel on one or both sides. Preferably, the object is a steel strip with zinc or a zinc iron alloy. Zinc or a zinc iron alloy is deposited on the object when the object is connected to form the cathode of a galvanic cell in an aqueous solution of zinc chloride and iron chloride with a pH of 0.1 to 3.0. The zinc chloride solution has a concentration of 50 to 1000 g/l for the deposition of metallic zinc. A partial flow of electrolyte solution is past continuously into a column filled with metallic zinc, where the trivalent iron formed there during the electrolysis is reduced to a bivalent iron, and metallic zinc is dissolved simultaneously therewith. The invention also describes an apparatus for the electrolytical coating of an object of steel.
摘要:
In a process for the electrolytic pickling of a high-grade steel strip, in particular a hot strip of high-grade steel, the hot strip of high-grade steel is alternately anodically and cathodically pickled in an aqueous solution of Na.sub.2 SO.sub.4 and subsequently in an aqueous solution of NaNO.sub.3 and NaF, as a result of which the formation of dangerous nitrous gases is prevented.
摘要翻译:在用于高品位钢带,特别是高品位钢带的电解酸洗的方法中,高品位钢的热带交替地在Na 2 SO 4水溶液中阳极和阴极酸洗,随后在 NaNO 3和NaF的水溶液,结果防止形成危险的亚硝酸气体。
摘要:
The invention refers to a process for production of raw stainless steel castings, in particular for stainless steel strip, covering rolling and annealing of cast material if required, as well as de-scaling, in particular by pickling in aqueous media, and coiling for raw stainless steel strip if necessary. In order to achieve greater flexibility as regards steel grades that can be treated and dimensions of the castings, the material is to be heat-treated in batches and preferably also annealed, cooled and de-scaled immediately after the final heat treatment stage, without intermediate storage, in batches. In a process covering the process stages for casting, rolling of the cast material if necessary, cooling, as well as de-scaling, in particular by pickling in aqueous media, and coiling, if necessary, to form raw stainless steel coils, the material is to be cast in batches and de-scaled immediately afterwards without intermediate storage in order to obtain the same advantage. The invention also covers equipment to carry out the process described.
摘要:
In a process for the manufacture of a metal foil, the metal foil is deposited electrolytically on an endless carrier belt, preferably an endless metal belt, in one or more cells, the current density being set to different levels in the plurality of cells and/or within each individual cell. A post treatment of the metal foil manufactured takes place wholly or at least in part on the endless carrier belt, thereby metal foils, respectively metal composite foils can be manufactured at favorable cost and with low labor input. The apparatus for carrying out the process comprises a plurality, at least two, vertical deposition cells having two upper deflecting rolls 21, 21' and at least one lower deflecting roll 22, the endless carrier belt 1, the anode 23, optionally composed of a plurality of partial anodes, and lateral sealing strips 24, forming a closed shaft through which the electrolyte flows, a plurality of, at least three, current rolls 30, 30', 22 being associated with each cell 2 and the arc of contact being at least 2.degree..
摘要:
A process and apparatus for pickling the surface of stainless steel strip feeds the stainless steel strip through a plurality of pickling tanks containing a hydrochloric acid pickling acid. The pickling acid bath is maintained at a temperature of at least about 40° C. An oxidizing agent is added to the acid solution in an amount to maintain at least about one third and preferably at least about half of the soluble iron in the form of ferric chloride based on the total amount of iron in the acid solution.
摘要:
An apparatus for supplying a soluble metal compound to an electrolyte solution uses a powder wetting device in a loop from a working tank. The powder wetting machine supplies the powdered metal compound directly into the electrolyte solution which rapidly dissolves to replenish the electrolyte compound during the treating process. The apparatus is particularly suitable for replenishing the metal salts consumed during an electroplating process.
摘要:
In a process for the electrolytic zinc coating of high-grade steel on one and two sides, the latter is connected as a cathode in the form of a high-grade steel strip in a galvanic cell, and metallic zinc is deposited on the high-grade steel strip from an aqueous solution of a zinc salt with a pH value of 1.0 to 2.5, preferably 1.5 to 2.0, as a result of which a contact corrosion with zinc-coated metal sheet is avoided, which is particularly important in the motor-car industry.
摘要:
In a process for the electrolytic pickling of chromium-containing stainless steel, pickling proceeds initially in an aqueous Na.sub.2 SO.sub.4 solution and subsequently in acid, preferably mixed acid. The CrO.sub.4.sup.2- formed is converted by the addition of reducing agent and acid as a function of the pH value and the redox potential to Cr.sub.2 (SO.sub.3).sub.3 or Cr.sub.2 (SO.sub.4).sub.3. H.sub.2 SO.sub.4 serves as the acid and a substance is used as a reducing agent selected from the group Na.sub.x H.sub.y S.sub.z O.sub.v, wherein x=0 to 2, y=0 to 2, y=1 to 6 and v=2 to 6. The pH value is adjusted to less than three by the addition of acid.
摘要翻译:在含铬不锈钢的电解酸洗方法中,酸洗最初在Na 2 SO 4水溶液中,随后在酸,优选混合酸中进行。 通过添加还原剂和酸作为Cr2(SO3)3或Cr2(SO4)3的pH值和氧化还原电位的函数来转化形成的CrO42-。 H2SO4用作酸,并且使用物质作为选自Nax Hy Sz Ov的还原剂,其中x = 0至2,y = 0至2,y = 1至6和v = 2至6。pH 通过添加酸将值调节至小于3。