Document Type and Number:
Japanese Patent JPS5124535
Kind Code:
A
Abstract:
A phosphate coating solution for forming coatings on a metal surface is contacted with an anion-exchanger loaded or contacted with nitrite ions, whereby the nitrate ions present in the coating solution are replaced by the nitrite ions. This process permits continued operation of a phosphate coating process without replenishing a nitrite solution. This process also allows no accumulation of alkali metal and/or ammonium ions unavailable for the phosphate coating and provides uniform coatings with satisfactory coating properties on the metal surface.
Inventors:
OKA SHOJI
MURAKAMI RYOICHI
OKAI TOSHIHIRO
MURAKAMI RYOICHI
OKAI TOSHIHIRO
Application Number:
JP9725174A
Publication Date:
February 27, 1976
Filing Date:
August 23, 1974
Export Citation:
Assignee:
NIPPON PAINT CO LTD
International Classes:
B01J41/04; C23C22/77; (IPC1-7): C23F7/08