公开(公告)号：DE2842941A1

公开(公告)日：1980-04-10

申请号：DE2842941

申请日：1978-10-02

Applicant: BASF AG

Inventor： FALK ROLAND DIPL CHEM DR ,  FEHRENBACH HUBERT ING GRAD

IPC: C23C22/76 ,  G11B5/84 ,  C23F7/26

Abstract: The substrates are kept in a horizontal position while they are conveyed through a spraying chamber, in which the substrates rest via changing point contact on a support. Vertical streams of an acid soln. are sprayed for a specified time downwards and upwards from nozzles onto the substrates to form the chromate. The substrates are then washed with water and dried via warm air. During the spraying of the acid soln., the nozzles are pref. subjected to swivel or yawing motions. The finely machined surface of the Al is passivated by a chromate layer prior to the deposition of a magnetisable layer, to obtain good corrosion resistance, and good adhesion of the magnetisable layer. The process improves the quality of the passivation.

公开(公告)号：DE2451232A1

公开(公告)日：1976-05-06

申请号：DE2451232

申请日：1974-10-29

Applicant: BASF AG

Inventor： WUNSCH GERD DIPL CHEM DR ,  FEHRENBACH HUBERT ING GRAD ,  LOESER WERNER DIPL ING DR ,  HUEBNER WERNER DIPL ING ,  FELLEISEN PETER DIPL ING ,  STECK WERNER DIPL CHEM DR

IPC: G11B5/72 ,  G11B5/84 ,  H01F41/14

Abstract: In the prodn. of rigid magnetic recording supports by depositing a thin Co-contg. ferro-magnetic metal film (I) on an anodised Al disc as substrate, opt. after depositing a non-magnetic intermediate metal coating (II), and providing the surface of (I) with a thin protective coating (III), the anodised Al disc is activated by treatment with a soln. of Pd(O) complex in an organic solvent and the complex is decomposed, pref. by heating, then (I) is deposited by electroless and then opt. electro-plating. Activation eliminates the need for (II) and discs with very good electromagnetic and the mechanical properties in use and good corrosion resistance are obtd. (I) is deposited directly on the activated surface. The metal-coatd disc is tempered under an inert gas at 150-300 degrees C. (III) is applied using a soln. of a film-forming organic lacquer binder in a volatile solvent to give a dry unbaked film thickness of max. 0.3 mu m, then the coating is dried and baked in an O2-contg. atmos. for 1-15 h at 200-300 degrees C.

公开(公告)号：DE3140893A1

公开(公告)日：1983-04-28

申请号：DE3140893

申请日：1981-10-15

Applicant: BASF AG

Inventor： ZWINTZSCHER KURT ,  NAGEL PETER DIPL ING ,  FEHRENBACH HUBERT ING GRAD ,  FALK ROLAND DIPL CHEM DR ,  DZIERZON ROCHUS DIPL ING

IPC: G11B5/84 ,  B29D17/00 ,  G11B5/82

Abstract: The coating unit and the finishing devices (18) both for uncoated and for coated discs (5) are assigned gripping tools (1) for the said discs, which tools can be moved on guide paths (17) and turning devices (13), combined with one another, for transporting the discs between the individual stations.