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Title:
METHOD FOR TREATING SURFACE OF ALUMINUM HEAT EXCHANGER
Document Type and Number:
WIPO Patent Application WO/2013/042725
Kind Code:
A1
Abstract:
To provide a surface treatment method capable of imparting exceptional corrosion resistance (white rust resistance) and moisture resistance (black discoloration resistance) to an NB heat exchanger used in an automotive air conditioner. The method comprises: (a) a step for subjecting an NB heat exchanger to a chemical conversion treatment and thereby forming a chemical conversion film on the surface thereof, the treatment being performed using a chemical conversion treatment agent that contains zirconium and/or titanium in a total amount of 5-5,000 ppm by weight, contains vanadium in an amount of 10-1,000 ppm by weight, and has a pH of 2-6; (b) a step for bringing the NB heat exchanger on whose surface the chemical conversion film is formed in step (a) into contact with a hydrophilization agent containing a hydrophilic resin and a guanidine compound and/or a salt thereof; and (c) a step for baking the NB heat exchanger subjected to the contacting process in step (b), whereby a hydrophilized film is formed on the surface thereof.

Inventors:
MATSUI NORIZUMI (JP)
WADA YUKO (JP)
MIZUNO AKIHIRO (JP)
HOKKA JUNSUKE (JP)
Application Number:
PCT/JP2012/074059
Publication Date:
March 28, 2013
Filing Date:
September 20, 2012
Export Citation:
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Assignee:
NIPPON PAINT CO LTD (JP)
MATSUI NORIZUMI (JP)
WADA YUKO (JP)
MIZUNO AKIHIRO (JP)
HOKKA JUNSUKE (JP)
International Classes:
C23C28/00; B05D7/14; C23C22/40; C23C22/44
Foreign References:
JP2006069197A2006-03-16
JP2011161876A2011-08-25
JP2011131206A2011-07-07
JP2009034589A2009-02-19
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
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Claims: