(19)
(11) EP 2 055 805 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.06.2011 Bulletin 2011/26

(43) Date of publication A2:
06.05.2009 Bulletin 2009/19

(21) Application number: 08018915.2

(22) Date of filing: 29.10.2008
(51) International Patent Classification (IPC): 
C23G 1/14(2006.01)
C23G 1/20(2006.01)
C11D 11/00(2006.01)
 C23G 1/16(2006.01)
C23G 1/26(2006.01)
C23C 22/78(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 02.11.2007 JP 2007286181
08.09.2008 JP 2008229996

(71) Applicant: Mazda Motor Corporation
Aki-gun Hiroshima 730-8670 (JP)

(72) Inventors:
  • Katsura, Daiji
    Aki-gun Hiroshima 730-8670 (JP)
  • Shigenaga, Tsutomu
    Aki-gun Hiroshima 730-8670 (JP)
  • Andou, Akira
    Aki-gun Hiroshima 730-8670 (JP)
  • Obara, Seiji
    Aki-gun Hiroshima 730-8670 (JP)

(74) Representative: Müller-Boré & Partner Patentanwälte 
Grafinger Straße 2
81671 München
81671 München (DE)

   


(54) Degreasing method and degreasing apparatus


(57) Prior to immersion of an object to be treated in a degreasing liquid, an aqueous solution 20 having a pH of 5.5 to 10. 0 is put into a sac-shaped portion of a vehicle body 2. Even when the vehicle body 2 is passed through the degreasing liquid, the aqueous solution 20 is not replaced with the degreasing liquid, and alkaline solid substances do not remain in the hemmed portion 2a. This prevents the water in the sac-shaped portion from having the high alkalinity even when water comes into the hemmed portion 2a later. The degreasing method can prevent the decrease in corrosion resistance of the joint portion of the object to be treated.







Search report