EP 0158287 B1 19900314 - PROCESS FOR TREATING ALUMINIUM SURFACES
Title (en)
PROCESS FOR TREATING ALUMINIUM SURFACES
Publication
Application
Priority
JP 7133484 A 19840410
Abstract (en)
[origin: JPS60215772A] PURPOSE:To form an aluminum fluoride-base film having superior hydrophilic property and corrosion resistance by treating the surface of Al or an Al alloy with a treating soln. having a specified composition contg. F. CONSTITUTION:Al or Al alloy parts such as the fins of a heat exchanger are treated with a treating soln. of 3-7pH at 40-100 deg.C. The treating soln. is prepd. by charging an aqueous soln. contg. 0.7-14g/l alkali metal such as Na, K or Li, 0.4-8g/l Si, 2-34g/l F and 0.01-1.5g/l Zn into an iron tank so as to add 0.05-1.0g/l Fe to the soln. Said amount of Fe may be added without using the iron tank, and part of insoluble matter may be suspended. By the treatment an Na3AlF6-base film contg. small amounts of Zn, Fe and Si is formed on each of the parts. The film is then chromated with a conventional chromating soln. to form a film having superior hydrophilic property and corrosion resistance.
IPC 1-7
IPC 8 full level
C23C 22/34 (2006.01); C23C 22/68 (2006.01); F28F 13/18 (2006.01)
CPC (source: EP US)
C23C 22/34 (2013.01 - EP US); C23C 22/68 (2013.01 - EP US); F28F 13/18 (2013.01 - EP US); F28F 2245/02 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR IT LI NL
DOCDB simple family (publication)
EP 0158287 A2 19851016; EP 0158287 A3 19870506; EP 0158287 B1 19900314; AT E51039 T1 19900315; AU 4096885 A 19851017; AU 577580 B2 19880929; BR 8501664 A 19851210; CA 1240454 A 19880816; DE 3512442 A1 19851031; DE 3576539 D1 19900419; DK 162185 A 19851011; DK 162185 D0 19850410; DK 163825 B 19920406; DK 163825 C 19920907; ES 542119 A0 19860401; ES 8605869 A1 19860401; GB 2157325 A 19851023; GB 2157325 B 19870528; GB 8509179 D0 19850515; JP S60215772 A 19851029; NZ 211723 A 19880212; PT 80260 A 19850501; PT 80260 B 19870316; US 4650525 A 19870317
DOCDB simple family (application)
EP 85104110 A 19850404; AT 85104110 T 19850404; AU 4096885 A 19850410; BR 8501664 A 19850409; CA 478782 A 19850410; DE 3512442 A 19850404; DE 3576539 T 19850404; DK 162185 A 19850410; ES 542119 A 19850410; GB 8509179 A 19850410; JP 7133484 A 19840410; NZ 21172385 A 19850410; PT 8026085 A 19850410; US 72181285 A 19850405