Patent ID: 9234283
Filing Date: 2016-01-12
CPC Classification: C23C

Claim Text:
1. A method of treating a surface of a metal substrate, said method comprising a) contacting said surface for a total time between about 1 second and about 2 minutes with an oxidizing acidic pre-rinse comprised of water and components: wherein component 3) the source of hydrogen ions consists of HF; at least a portion of component 1) is sourced from HF; and the pre-rinse has an oxidation potential that is at least 150 mV more oxidizing than a standard hydrogen electrode and not more than 550 mV more oxidizing than the standard hydrogen electrode; and b) following step a), contacting said surface with an acidic aqueous coating composition comprised of ions of one or more elements selected from the group consisting of titanium, zirconium, hafnium, silicon, tin, germanium, aluminum and boron.