Reducing the reflectance of a metallic surface

A method of reducing the reflectance of a metallic surface 2 comprises immersing the surface in a liquid dielectric 5, causing electric current to flow from an electrode, eg. anode 6 in the dielectric to the surface and moving the electrode relative to the surface such that an area of the surface is...

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Bibliographische Detailangaben
Hauptverfasser:	BRIAN FREDERICK SMITH, JOHN EVANS
Format:	Patent
Sprache:	eng
Schlagworte:	MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PERFORMING OPERATIONS PHYSICS SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL TRANSPORTING WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL
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Beschreibung
Zusammenfassung:	A method of reducing the reflectance of a metallic surface 2 comprises immersing the surface in a liquid dielectric 5, causing electric current to flow from an electrode, eg. anode 6 in the dielectric to the surface and moving the electrode relative to the surface such that an area of the surface is roughened. This method produces surfaces having lower reflectance values than those produced by prior art methods eg. painting, chemical blacking. In addition, the liquid dielectric removes a proportion of the heat generated by this process, thereby rendering it suitable for use on low melting-point materials, eg. aluminium, which was not possible hitherto.