4Wolpers M, Angeli J. Activation of galvanized steel surfaces before zinc phosphating -XPS and GDOES investigations[J]. Applied Surface Science, 2001,179.
5Melmut Endress. Composition and Process for Activating Metal Surfaces Prior to Zinc Phosphating and Process for Making Said Compositon[P]. US Pat :4 957 568,1990.
6Gerald J Cormier. Rapidly dissolving and storage stable titanium posphate containing activating composition[P]. US Pat: 5 326408,1994.
7Angela Wright. Liquid rinse conditioner for phosphate corversion coatings[P]. US Pat :5 494 504,1996.
