EP 2944707 A1 20151118 - Conversion coating process for magnesium alloys
Title (en)
Conversion coating process for magnesium alloys
Title (de)
Umwandlungsbeschichtungsverfahren für Magnesiumlegierungen
Title (fr)
Procédé de revêtement par conversion pour alliages de magnésium
Publication
Application
Priority
EP 14382173 A 20140516
Abstract (en)
The present invention relates to a process for surface treating a magnesium alloy which comprises the following steps: (i) blasting the substrate; (ii) degreasing the substrate; (iii) pickling the substrate; (iv) activating the substrate; and (v) contacting the substrate with a chemical conversion coating solution comprising potassium permanganate and sodium phosphate and one of the following additives mixture: (a) calcium nitrate and yttrium nitrate or (b) calcium nitrate and sodium vanadate. The invention also relates to a magnesium alloy substrate obtained according to the process of the invention, to its use in the aerospace and automotive sectors, to parts for use in these sectors, and to a chemical conversion coating solution suitable for use in the process comprising potassium permanganate, sodium phosphate, and (a) calcium nitrate and yttrium nitrate, or (b) calcium nitrate and sodium vanadate.
IPC 8 full level
C23C 22/22 (2006.01); C23C 22/42 (2006.01); C23C 22/78 (2006.01)
CPC (source: EP)
C23C 22/22 (2013.01); C23C 22/42 (2013.01); C23C 22/78 (2013.01)
Citation (applicant)
- US 2002174915 A1 20021128 - FUTSUHARA MASANOBU [JP], et al
- ES 2178917 A1 20030101 - FUNDACION INASMET [ES]
Citation (search report)
- [I] CN 1388270 A 20030101 - SHANGHAI METAL CORROSION & PRO [CN]
- [A] US 2005106403 A1 20050519 - YUI YASUSHI [JP]
- [A] CN 1632169 A 20050629 - UNIV DALIAN TECH [CN]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2944707 A1 20151118; EP 2944707 B1 20170322; ES 2631136 T3 20170828
DOCDB simple family (application)
EP 14382173 A 20140516; ES 14382173 T 20140516