Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
  • C25F1/02—Pickling; Descaling
  • C25F1/04—Pickling; Descaling in solution
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
  • C25F1/02—Pickling; Descaling
  • C25F1/04—Pickling; Descaling in solution
  • C25F1/06—Iron or steel
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

• the present invention relates to a method and a device for cleaning of metal surfaces in a cleaning area, in particular for cleaning Stainless steel surfaces in the area of welds, with an electrode, preferably by means of a solution carrier attached to the electrode, with moistened a cleaning solution and brought to the cleaning area and / or placed on the cleaning area and / or relative to Cleaning area is moved, wherein the electrode to a first pole of a Power source and the workpiece to be cleaned as a counter electrode to a second Pol the power source is connected, and wherein by means of the power source a Cleaning voltage between the two poles is applied.
• Such methods and devices for cleaning metal surfaces are well known. They are used in particular on metal surfaces, the previously treated or processed at high temperatures, for example on Welds or laser or plasma cutting edges. In these at high Temperatures machined areas may alter the metal surface on the one hand by stains or discoloration due to heat-related tempering colors and / or on the other hand to form processing residues, in particular of Oxide layers, slag and / or scale parts come from what both technical as well as aesthetic reasons may be undesirable. So increase For example, oxide layers, the susceptibility to corrosion of the heat-treated Metal areas, which is why you usually just after a welding process removed and the thus cleaned areas provided with a corrosion protection. Also Tarnish colors should be removed as they not only affect the appearance of the workpiece but the material in this area also its Can lose corrosion resistance.
• Object of the present invention is therefore to provide a quick and easy to perform Method and an inexpensive to manufacture and structurally simple To provide device of the type mentioned, or the simple Manner and with little effort and at low cost a thorough and fast cleaning of metal surfaces possible.
• it should be so also welds on stainless steel workpieces produced by the MAG process be cleaned easily, quickly and highly effectively.
• At least one high voltage pulse with a maximum voltage of about 40 volts, preferably of over 400 volts and preferably with a mean pulse duration between 5 * 10 -12 seconds and 1 second is applied.
• the mean pulse duration refers to the duration during which the high voltage pulse has a voltage of at least 50% of the maximum pulse voltage.
• the main advantage is that in this way also MAG-welded Weld seams on stainless steel workpieces cleaned easily, quickly and highly efficiently can be.
• inventive electrochemical cleaning method inventive application of at least a short high voltage pulse Metal surfaces within a short time and with very little effort and with low cost so thoroughly cleaned that all disturbing Processing residues are completely or at least almost completely removed.
• inventive electrolytic and material-removing cleaning allows thus much better cleaning results than those known for a long time and previously used cleaning methods.
• the inventive method provides one for different welding processes and different metals significantly improved cleaning effect. By far the biggest advances are in MAG welds both in terms of significant time savings as well regarding the thoroughness of the cleaning, since the cleaning of MAG welds with previously known methods and devices always a meant a considerable amount of work and time.
• the inventive method is in contrast to the known chemical cleaning process due to the lack of highly toxic Solutions environmentally friendly and requires no special in this regard Precautions or measures. Rinse off the cleaning area after Termination of the process according to the invention is not necessary, but it can be made without any special disposal of the rinse water necessary is. In particular, it is also advantageous that in the execution of the No toxic gases or vapors are produced.
• the cleaning method according to the invention can also be used with relative ease long outdoor welds can be applied quickly and easily.
• At least one short high-voltage pulse having a mean pulse duration between 10 -10 seconds and 10 -5 seconds, preferably between 10 -9 seconds and 10 -7 seconds, is applied, and if so thereafter Voltage between 10 volts and 110 volts, preferably between 40 volts and 60 volts, is applied.
• a high voltage pulse directly at the beginning of the applied cleaning voltage particularly good cleaning results can be achieved.
• the cleaning effect of the method according to the invention can be further enhanced by first applying a high-voltage pulse with a voltage of more than 4 kV, in particular more than 6 kV.
• the inventive method can be both DC voltage, wherein the first Pol is connected as positive pole and the second pole as negative pole, as well as with AC voltage are operated, with AC voltage a particularly good cleaning effect can be achieved.
• the high voltage pulse set a continuous and constant current flow becomes.
• a duty cycle of 100% allows optimal cleaning results be reached within a short time.
• the cleaning solution be a mixture of inorganic acids, in particular a mixture of sulfuric acid and Contains phosphoric acid.
• a mixture of inorganic acids in particular a mixture of sulfuric acid and Contains phosphoric acid.
• Such a mixture allows much better Cleaning results as the use of only a single acid.
• the cleaning solution is a mixture which consists to a part of a mixture of sulfuric acid and of Phosphoric acid and at least two parts of water.
• Such Solution is optimal using the method of the invention Cleaning effect not only for the environment, but especially for the Procedural persons essential because of their low concentration Less problematic than more highly concentrated solutions according to the previous used cleaning process.
• the sulfuric acid with a Concentration of 30 to 40% by weight, preferably 35 to 38% by weight is used and / or if the phosphoric acid with a concentration of 70 to 80 wt .-%, preferably from 76 to 79 wt .-% is used.
• the device according to the invention also serves for the cleaning of metal surfaces in a cleaning area, in particular for cleaning Stainless steel surfaces in the area of welds.
• It includes an electrode, the, preferably by means of a attached to the electrode or attachable Solution carrier, moistened with a cleaning solution and to the Cleaning area introduced and / or placed on the cleaning area and / or can be moved relative to the cleaning area.
• It also includes a current source with a connectable to the electrode first pole and with a connectable to the workpiece to be cleaned second pole, by means of the power source, a cleaning voltage between the two poles can be applied.
• At least one high voltage pulse with a voltage of about 40 volts, preferably of over 400 volts, and preferably with a mean pulse duration between 5 * 10 -12 seconds and 1 second can be applied by the power source.
• the inventive Device is inexpensive to manufacture with simple design and can easily as a portable treatment device or as a handheld device both in operation as can also be used easily on the construction site on site.
• This Device according to the invention is as well as with the method according to the invention an economical removal of temper colors and of slag residues or other impurities at welds of any kind to different Metal materials possible.
• the device according to the invention has a power source, by which a cleaning voltage between 10 volts and 110 volts, preferably between 40 volts and 60 volts, can be applied, wherein immediately upon application of the cleaning voltage at least a short high voltage pulse with a mean pulse duration between 10 -10 seconds and 10 -5 seconds, preferably between 10 -9 seconds and 10 -7 seconds, can be applied.
• a current flow through the current source between 5 and 180 amps, preferably between 12 and 50 amps is providable and / or if by the power source a continuous and constant current flow is available.
• the device of the invention optimally to different conditions It is further proposed that the current source be adjusted advantageously adjusting means for adjusting the voltage and / or adjusting means has to adjust the current flow.
• the electrode preferably as a manually movable stamp is formed, at its the cleaning area end facing an elastic compressible solution carrier, in particular a piece of felt or glass fiber fabric or have a sponge.
• an elastic compressible solution carrier in particular a piece of felt or glass fiber fabric or have a sponge.
• the subject of the present invention is also an electrolytic cleaning solution, in particular for the cleaning of metal surfaces and preferably for Cleaning of stainless steel surfaces in the area of welds, the one Mixture containing one third of a mixture of sulfuric acid and of phosphoric acid and two-thirds of water, wherein the Sulfuric acid in a concentration of 30 to 40 wt .-%, preferably of 35 to 38 wt .-% is present and the phosphoric acid in a concentration of 70 to 80 Wt .-%, preferably from 76 to 79 wt .-% is present.
• Such a solution can in particular in the method described above and / or in the Device described above are used to optimum Cleaning effect even when produced by the MAG process welds to achieve stainless steel workpieces. But even with conventional electrochemical cleaning process can with this inventive solution the cleaning effect can be increased.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Cleaning By Liquid Or Steam (AREA)

Applications Claiming Priority (2)

Publications (2)

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Cited By (3)

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• 2004
  • 2004-07-28 EP EP04017834A patent/EP1502971A3/fr not_active Withdrawn

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