Aqueous inorganic zinc-rich coating composition
AssigneeDai Nippon Toryo Co., Ltd.
InventorsToshinori Morizane, Yoshio Yamada, Junichi Takagishi, Hidenori Matsuno, Masaki Ohshiba
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Abstract
An aqueous inorganic zinc-rich coating composition employs zinc powder and a vehicle containing an aqueous solution containing a specific alkali silicate, an ammonium ion, and a halide ion at specific concentrations; a vehicle containing an aqueous solution containing the above ingredients at specific concentrations and additionally an alkali halide at a specific concentration; or a vehicle containing an aqueous solution containing a specific alkali silicate and an alkali halide at specific concentrations, wherein the vehicle and zinc powder are contained at a specific ratio.
Claims20
An aqueous inorganic zinc-rich coating composition, characterized in that the composition comprises a vehicle comprising an aqueous solution containing an alkali silicate represented by formula M2O.nSiO2 (wherein M represents Na, K, Li, or Cs, and n is an number of 2 to 4) at a concentration of 10 to 50 mass %, an ammonium ion at a concentration of 0.01 to 0.1 M, and a halide ion at a concentration of 0.01 to 1 M, and zinc powder, wherein the composition in the form of dried film contains the vehicle and zinc powder in such amounts that the composition has a binder solid content of 5 to 20 mass % and a zinc powder content of 80 to 95 mass %.
(canceled)
Dependencies are inferred from the claim text.