Abstract:
Use of an aluminium composite material in a thermal joining method, said material consisting of at least one aluminium core alloy and at least one external brazing layer consisting of an aluminium brazing alloy provided on one or both sides of the aluminium core alloy, wherein the aluminium brazing layer has a pickled surface. Reduced costs and a lower environmental impact is achieved by using an aluminium composite material in which the pickled surface of the aluminium brazing layer had been pickled by pickling with an acid, aqueous pickling solution containing at least one mineral acid and at least one complex-forming agent or a complexing mineral acid, wherein the removal of material in the pickling is between 0.05 g/m2 and 6 g/m2, the aluminium composite material is used in a flux-free, thermal joining method, and the joining method is carried out in the presence of a protective gas.
Abstract translation:在热接合方法中使用铝复合材料,所述材料由至少一个铝芯合金和至少一个外壳钎焊层组成,所述至少一个外部钎焊层由在铝芯合金的一侧或两侧上提供的铝钎焊合金组成,其中铝 钎焊层具有酸洗表面。 通过使用铝复合材料来实现降低成本和降低环境影响,其中铝钎焊层的酸洗表面通过酸洗酸洗,含有至少一种无机酸的水性酸洗液和至少一种络合物形成 代理或络合无机酸,其中在酸洗中去除材料为0.05g / m 2至6g / m 2,铝复合材料以无助焊剂热接合方法使用,并且进行接合方法 在有保护气体的情况下。
Abstract:
Cleaning compositions and methods of making and using the same are provided. The cleaning compositions of the present invention may include at least one alkyl 3-hydroxybutyrate and water, optionally including at least one surfactant and one or more additional additives. The cleaning compositions of the present invention, which are non-toxic and environmentally benign, can be useful to remove many types of soils from a range of different substrates in a variety of domestic, industrial, and/or institutional applications.
Abstract:
Described here is a method for pretreating the surfaces of weld parts of aluminum or alloys thereof, and weld parts produced with said method. Prior to welding, the weld parts are subjected to a treatment (17) in an acidic, aqueous solution, wherein the acidic, aqueous solution contains ions of the elements boron and/or silicon and/or titanium and/or zirconium and/or hafnium. The invention consists in that a polishing step (9) is carried out prior to the treatment in the acidic, aqueous solution to make for better sliding in a feed apparatus during the welding process.
Abstract:
In a method of cleaning metal-containing deposits such as tantalum from a surface of a process chamber component, such as a metal surface, the surface is immersed in a cleaning solution. In one version, the cleaning solution is a solution having HF and HNO3 in a ratio that removes deposits from the surface substantially without eroding the surface. In another version, the cleaning solution is a solution having KOH and H2O2. The solution can be treated after cleaning the surface to recover tantalum-containing materials and one or more of the cleaning solutions.
Abstract translation:在诸如金属表面的处理室部件的表面上清洗含金属沉积物如钽的方法中,将表面浸入清洁溶液中。 在一个版本中,清洁溶液是具有HF和HNO 3 3的溶液,其比例基本上不侵蚀表面从表面除去沉积物。 在另一个版本中,清洁溶液是具有KOH和H 2 O 2 O 2的溶液。 在清洁表面后可以处理溶液以回收含钽材料和一种或多种清洁溶液。
Abstract:
The present invention provides an aqueous cleaning solution for aluminum-based metals which comprises an inorganic acid in an amount to provide a pH value of 2 or less, an oxidized form metal ion and a surfactant represented by the following formula (I)R--O--(EO).sub.n H (I)wherein R represents an alkyl group having on average 10 to 18 carbon atoms per molecule, n represents an integer of 8 or greater, and EO represents an ethyleneoxy group which may contain a small proportion of a propyleneoxy group. The degradation of cleaning properties due to the accumulation of lubricating oil or decomposition of surfactants is lessened even when the cleaning operation is carried out for a long period of time.
Abstract:
An acidic cleaning aqueous solution for carrying out a low temperature acidic cleaning of aluminum and aluminum alloy and a cleaning method for the same free from harmful fluorine and chromium ions. The acidic cleaning aqueous solution includes oxidized metal ions as an etching promoter, an inorganic acid, a surfactant and a certain amount of polyhydric alcohols having at least two hydroxyl groups directly coupled with two adjacent carbon atoms of a principal chain within one molecule and further includes an oxidizing agent for oxidizing the oxidized metal ions reduced in the cleaning. Certain alcohols in the acidic cleaning aqueous solution can control the oxidative decomposition reaction of the surfactant to obtain a long life acidic cleaning aqueous solution.
Abstract:
Disclosed is an acidic cleaning aqueous solution for aluminum and aluminum alloy and a process for cleaning the same, intended to execute acidic cleaning without using harmful fluoride and chloride ions.The oxidation-reduction potential of a cleaning bath is controlled to be at 0.5 to 0.8 V (vs. Ag-AgCl). The cleaning bath is obtained by diluting an acidic cleaning aqueous solution for aluminum and aluminum alloy to a predetermined volume. The acidic cleaning aqueous solution contains specified amounts of at least one of inorganic acids, Br.sup.- ions and oxidized metal ions, with the addition of a surfactant and oxidizing agent if necessary.It is thus possible to present a uniform etching effect irrespective of low temperature (below 60.degree. C.) without containing fluoride ions and chromic ions within the acidic cleaning aqueous solution. Br.sup.- also has an effect of inhibiting the oxidation-decomposition reaction of the surfactant arising from the oxidizing agent and oxidized metal ions, thereby obtaining a long-life acidic cleaning aqueous solution.
Abstract:
The invention is a metal treating process which uses a chrome-free deoxidizing bath. The process is useful for cleaning and deoxidizing aluminum substrates followed by conversion coating of the cleaned and deoxidized substrates.
Abstract:
A chemical treatment of an aluminum cathode used in zinc electrowinning consists of contacting the affected areas of the aluminum cathode or the entire surface of the cathode with a dilute hydrochloric acid aqueous solution.
Abstract:
Problems with previously known aqueous acidic rinsing solutions for aluminum after shaping while using surface lubricants are avoided by use of a solution which contains water and (A) orthophosphoric acid in an amount to give a stoichiometric equivalent of 3.0 to 50 g/L as PO.sub.4.sup.-3, (B) an aluminum ion sequestrant component in an amount of 0.01 to 10.0 g/L; and (C) 20 to 170 ppm of ferric ion. The ferric ions act to inhibit corrosion of the stainless steel process equipment. Preferably the solution also contains 0.1 to 1.0 g/L of H.sub.2 O.sub.2, NO.sub.2.sup.-1 ions, or a mixture thereof to reoxidize ferrous ions formed by reduction of ferric ions during use of the solution and thus maintain the concentration of ferric ions above 20 ppm at all times. The solution may also contain surfactant and up to 10 g/L of dissolved aluminum ions.