| 摘要 |
The corrosion resistance of an article having a surface with a primary inorganic coating, such as a conversion coating, over a metal substrate treated by a primary coating with an aqueous liquid sealing composition comprising lithium cations and vanadate anions. This treatment is particularly advantageous for primary coatings formed on aluminium alloys by treating them with a conversion coating forming aqueous composition made by reacting cobalt (II) cations, acetate ions, hydroxyalkyl amines, and peroxides in aqueous solution. The composition comprises water and (a) a concentration of at least 0.004 M/kg lithium cations; (b) a concentration of at least 0.0005 M/kg vanadium atoms in vanadate anions; and (c) a concentration of fluorine-containing anions that corresponds stoichiometrically to a concentration of fluorine atoms. The composition may optionally further comprised of a surfactant of the Formula (I). Wherein; x and y represents a non-negative integer; and R represents a saturated alkyl moiety hydrophobe group.
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