4.17 To obtain a coating of tombac alloy (90 wt.-% copper and 10 wt.-% zinc), an electrolyte containing Na2Zn(CN)4 and KCu(CN)2 was used at a current density of 3.0 A/dm2; W=80%. The deposit density was 8.6 g/cm3. What is the duration of deposition of a 150 µm thick tombac layer on the parts?

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