Adhesive bonding process for aluminum alloy bodies including hypophosphorous acid anodizing
Type: Patent
View the complete
patent at USPTO.gov
  
Number: 06531013
Market: Aerospace,Alumina,Aluminum Ingot,Automotive,Building & construction,Commercial transportation,Industrial products,Packaging and consumer,Oil & Gas,Consumer electronics,Sustainability
Technology: Alloy product & process
Year: 2003
Abstract: An adhesive bonding process for making vehicle structures wherein a surface portion of an aluminum alloy body is anodized in an aqueous solution of hypophosphorous acid (H.sub.3 PO.sub.2) to form an anodic oxide coating. A layer of adhesive is applied onto the surface portion and the adhesive coated anodized surface portion is joined to an adjacent metal structure. The phosphorous acid anodizing is preferably carried out for less than 1 minute at about 5-40 volts and a current density of about 1-50 mA/cm.sup.2 in a solution containing about 1-25 wt % hypophosphorous acid. Anodization time is more preferably about 10-30 seconds and is about 20 seconds in a particularly preferred embodiment.
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