A surface treatment, especially for titanium and aluminum alloys, forms a sol-gel film covalently bonded on the metal surface to produce strong, durable adhesive bonds between the metal and an organic adhesive without using toxic chemicals and while significantly reducing or eliminating rinse water requirements...http://www.google.es/patents/US5869141?utm_source=gb-gplus-sharePatente US5869141 - Surface pretreatment for sol coating of metals
