公开(公告)号：PL368625A1

公开(公告)日：2004-12-27

申请号：PL36862504

申请日：2004-06-18

Applicant: UNITED TECHNOLOGIES CORP

Inventor： TANG XIA ,  JAWOROWSKI MARK ,  HAMMERSCHMIDT KENNETH

IPC: C23C22/08 ,  C23C22/00 ,  C23C22/07 ,  C23C22/36 ,  C23C22/44 ,  C23F11/00

Abstract: A chromate-free, phosphate-fluoride conversion coating, with or without vanadate, formed on a magnesium or a magnesium alloy substrate, includes an active corrosion inhibitor selected from the group consisting of organo-phosphonic acids. The phosphonic acid group reacts with the magnesium metal of the substrate to form an insoluble salt.