The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1990
Filed:
Sep. 29, 1988
Richard Doetzer, Nuernberg, DE;
Georg Iwantscheff, Nuernberg, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
The invention provides a high-purity electroaluminum layer having a purity of greater than 99.99% and, preferably, a thickness of 10 to 20 .mu.m which serves as a gas barrier layer, particularly for hydrogen, oxygen, tritium and water vapor, for metallic materials and nonmetallic materials such as glass, quartz, ceramic and cermets with an electroconductive surface as well as for conductive plastics. By post-treatment, the electroaluminum layer can be compacted. The electroaluminum layer is precipitated by electroplating from aprotic oxygen-free and anhydrous electrolyte media of the general formula M.sup.I X.2AlR.sub.3.nLsm, wherein M.sup.I is an alkali metal ion or a quaternary onium ion, X is a halogen ion, preferably F.sup.- or Cl.sup.-, R is an alkyl radical, preferably CH.sub.3, C.sub.2 H.sub.5, C.sub.3 H.sub.7 or C.sub.4 H.sub.9, Lsm is an aromatic solvent molecule, preferably toluene, ethyl benzene, xylene or a mixture thereof, and n=0 to 12, at a bath temperature of 50.degree. to 110.degree. C. and a current density of 0.5 to 10 A/dm.sup.2 under intensive bath agitation. Electroplating may be conducted in the presence of an aromatic solvent.