公开(公告)号：US5112414A

公开(公告)日：1992-05-12

申请号：US698650

申请日：1991-05-10

申请人： Karl-Dieter Brands ,  Helmut Endres ,  Peter Christophliemk ,  Wolf-Achim Roland

发明人： Karl-Dieter Brands ,  Helmut Endres ,  Peter Christophliemk ,  Wolf-Achim Roland

IPC分类号： C23C22/80 ,  C23C22/78

CPC分类号： C23C22/78

摘要： Effective, titanium-free agents for activating metal surfaces prior to phosphating these surfaces with phosphating baths containing zinc ions can be made by reacting alkali metal phosphates with 1,1-diphosphonic acids and their alkali metal slats and/or poly(aldehydocarboxylic acids) and their alkali metal salts.