公开(公告)号：EP0799326A1

公开(公告)日：1997-10-08

申请号：EP95943426.0

申请日：1995-12-22

申请人： HENKEL CORPORATION

发明人： IINO, Yasuo ,  SHIMIZU, Akio ,  IKEDA, Toshihiro

IPC分类号： C23C22

CPC分类号： C23C22/361

摘要： A highly corrosion-resistant, strongly paint-adherent conversion coating is formed on the surface of aluminiferous metal substrates by contacting such surfaces for 0.5 to 60 seconds with a sludging-free water-based surface treatment bath that has a pH of 1.5 to 4.0 and contains a zirconium compound, phosphoric acid compound, oxidizing agent, and a compound that is a source of hydrogen fluoride (in a quantity that produces a concentration of from 0.0001 to 0.2 g/L HF in the treatment bath). This contact is preferably followed by a water rinse and drying.