| 摘要 |
In one embodiment, this invention relates to an aqueous acid iron phosphorus bath which comprises (A) at least one compound from which iron can be electrolytically deposited, (B) hypophosphite ion, and (C) sulfur-containing compound represented by the formula <?in-line-formulae description="In-line Formulae" end="lead"?>Y-S-R1-SO3X I<?in-line-formulae description="In-line Formulae" end="tail"?> wherein X is H or an alkali metal, R1 is an alkylene group containing from 1 to about 5 carbon atoms, Y is H, S-R1-SO3X, C(S)NR2'', C(S)OR'', C(NH2)NR2'', or a heterocyclic group, and each R'' is independently H, or an alkyl group containing from 1 to about 5 carbon atoms. Optionally, the aqueous acidic iron phosphorus electroplating bath of the invention also may comprise aluminum irons. The alloys which are deposited on the substrates by the process of the present invention are characterized by the presence of iron, phosphorus and sulfur.
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