Patent ID: 8821707
Filing Date: 2014-09-02
Classification: C25D

Abstract:
1. An electric Al—Zr alloy plating bath which comprises (A) an aluminum halide; (B) one kind of compound or at least two kinds of compounds selected from the group consisting of N-alkylpyridinium halides, N-alkylimidazolium halides, N,N′-dialkylimidazolium halides, N-alkyl-pyrazolium halides, N,N′-dialkylpyrazolium halides, N-alkylpyrrolidinium halides and N,N-dialkyl-pyrrolidinium halides; (C) a high boiling point alkyl-substituted and/or hydroxyl-substituted aromatic hydrocarbon solvent, selected from one of 1,2,3-trimethylbenzene, or 1,2,3,4-tetrahydronaphthalene, and having a boiling point of not less than 160° C.; and (F) a zirconium salt, wherein the molar ratio of the aluminum halide (A) to the compound (B) ranges from 1:1 to 3:1, the concentration of the high boiling point aromatic hydrocarbon solvent is from 5 to 50% by volume, the concentration of the zirconium salt in the plating bath ranges from 1 to 20 g/L and the flash point of the plating bath is not less than 61° C.