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Title:
SURFACE TREATMENT METHOD FOR ALUMINUM HEAT EXCHANGERS
Document Type and Number:
WIPO Patent Application WO/2013/133434
Kind Code:
A1
Abstract:
To provide a surface treatment method which is capable of providing an aluminum heat exchanger with excellent corrosion resistance (white rust resistance) and moisture resistance (blackening resistance). A surface treatment method for aluminum heat exchangers, which comprises: (a) a step wherein a chemical conversion coating film is formed on the surface of an aluminum heat exchanger by subjecting the aluminum heat exchanger to chemical conversion using a chemical conversion agent; (b) a step wherein the aluminum heat exchanger, the surface of which has been provided with a chemical conversion coating film in step (a), is brought into contact with a hydrophilizing agent that contains a hydrophilic resin; and (c) a step wherein a hydrophilized coating film is formed on the surface of the aluminum heat exchanger by baking the aluminum heat exchanger, which has been subjected to a contact treatment in step (b). The chemical conversion agent used in step (a) contains zirconium and/or titanium in an amount of 5-5,000 ppm by mass in total, vanadium in an amount of 10-1,000 ppm by mass and a metal stabilizer in an amount of 5-5,000 ppm by mass. In addition, the chemical conversion agent used in step (a) has a pH of 2-6.

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Inventors:
MATSUI NORIZUMI (JP)
MIZUNO AKIHIRO (JP)
WADA YUKO (JP)
HOKKA JUNSUKE (JP)
Application Number:
PCT/JP2013/056547
Publication Date:
September 12, 2013
Filing Date:
March 08, 2013
Export Citation:
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Assignee:
NIPPON PAINT CO LTD (JP)
International Classes:
C23C22/44; B05D3/10; B05D7/14; B23K1/00; C23C22/34; F28F13/18; F28F19/02
Foreign References:
JP2011214105A2011-10-27
JP2008088552A2008-04-17
JP2002030460A2002-01-31
JP2005008975A2005-01-13
JP2012017524A2012-01-26
JP2000199077A2000-07-18
JP2006069197A2006-03-16
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
Download PDF:
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Claims:



 
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