公开(公告)号：DE3774969D1

公开(公告)日：1992-01-16

申请号：DE3774969

申请日：1987-08-22

Applicant: BASF AG

Inventor： RICHTER JUERGEN DR ,  GRAU WERNER DR ,  MAURER GERD PROF DR ,  DOMAS FRIEDRICH ,  LOESER WERNER DR ,  BENDER RAINER DR ,  SCHULZE AXEL-RUEDIGER DR ,  DOERR KURT DR

IPC: G11B5/73 ,  G11B5/84 ,  G11B5/704

Abstract: Method of surface treating Ni-coated Al substrates to produce a polished and texture surface of roughness depth Rt of 0.04-0.1um, a average roughness depth R2 of 0.04-0.1um and an average roughness value Ra of 0.0065-0.0095, consists of lap-polishing both sides of the substrate with a polishing material to remove 2-4um of the surface layer and produce an average roughness value of 0.04-0.06um. Without removing the substrate from the polishing machine, a second process using a polishing material having 3-10 times the grain size is effected to produce an essentially paddle wheel structured texture.