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Verfahren zur Reinigung von Oberflaechen sowie Verwendung des Verfahrens

Method for cleaning surface of precision processing aluminum containing component, comprises treating the component with a cleaning agent dissolving aluminum containing passivation layer present on the surface of the component
 
: Mueller, S.; Eberhardt, R.; Rohde, M.

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Frontpage ()

DE 102007037903 A: 20070810
DE 102007037903 A: 20070810
B08B0003
C23G0005
German
Patent, Electronic Publication
Fraunhofer IOF ()

Abstract
(A1) Vorliegende Erfindung betrifft ein Verfahren zur Reinigung von Oberflaechen, insbesondere von praezisionsbearbeitenden, aluminiumhaltigen Bauteilen, wobei die Oberflaeche des Bauteils zuerst mit einer Saeure von der auf dem Bauteil anhaftenden Verunreinigung und der Passivierungsschicht gesaeubert wird, anschliessend mit gereinigtem Wasser gewaschen und im Anschluss daran getrocknet wird. Dabei waechst dann kontrolliert eine neue Passivierungsschicht auf.

 

DE 102007037903 A1 UPAB: 20090311 NOVELTY - The method for cleaning surface of precision processing aluminum containing component, comprises treating the component with a cleaning agent with a pH value of less than 6, which dissolves aluminum containing passivation layer present on the surface of the component, under removal of contaminations contained in the passivation layer, cleaning the component with water under formation of a fluid film wetting the surface of the component, drying the component through controlled removal of the fluid film, and developing a homogeneous or contamination free passivation layer. DETAILED DESCRIPTION - The method for cleaning surface of precision processing aluminum containing component, comprises treating the component with a cleaning agent with a pH value of less than 6, which dissolves aluminum containing passivation layer present on the surface of the component, under removal of contaminations contained in the passivation layer, cleaning the component with water under formation of a fluid film wetting the surface of the component, drying the component through controlled removal of the fluid film, and developing a homogeneous or contamination free passivation layer. The cleaning agent is watery solution containing hydroxycarboxylic acid with an acid concentration of 0.5-3 wt.% and a pH value of 2-4. The component is wetted with water, watery solution of surfactant, alcohol and/or watery solution of alcohol. The water has a conductance of maximum 0.5 mu S/cm. The treatment and/or the cleaning is carried out at 50-70 degrees C. The component is subjected with ultrasound in a frequency range of 42-47 kHz in further step. The subjecting of the component with the ultrasound is carried out with a power of 1200-1500 W/m2 on the surface of the component. The treatment and/or cleaning of the component is carried out over a time period of 2-4 min. The component is moved during the treatment. In the drying and/or developing, the component is contacted with cleaned air. An ultra precision processing such as turning, shaping, cutting, drilling and polishing is carried out under use of diamond tool before the treatment. The treating and/or cleaning of the component is carried out through dipping, coating, spraying and/or wetting. In the cleaning step, the component is submerged in the water and in the drying step, the component is removed from the water with a speed of 10-15 cm/min. The component is partially wetted with the watery solution of acid and deionised water, subsequently washed with desalinated water and then removed from the water under contacting of the component with air in controlled manner. The partial wetting of the component with deionised water is carried out at a water temperature of 15-25 degrees C and the partial wetting of the component with watery solution of acid is carried out at acid temperature of 50-70 degrees C. USE - Method for cleaning surface of precision processing aluminum containing component such as reflexive and/or reflective optical component, mirror, patterns, reference object, tools, baffle, frames and grating (claimed). ADVANTAGE - The method ensures cleaning of surface of precision processing aluminum containing component with high standards of cleanliness and high optical quality.

: http://publica.fraunhofer.de/documents/N-91350.html