Process for Electrolytically Depositing a Tin- and Rutenium-Based Alloy, the Electrolytic Bath That Permits Said Alloy to Deposit and the Alloy Obtained by Means of Said Process

摘要

The invention refers to the electrolytic deposit of a tin- and ruthenium-based alloy having good features of corrosion resistance. In particular, the invention refers to an ecologically compatible process to achieve the electrolytic deposit of the alloy and to the operative conditions to make the deposit. Moreover, the invention refers to the electrolytic bath from which the alloy is caused to electro-deposit. In particular, the electrolytic bath is advantageously distinguished by the total absence of toxic metals and cyanides. The invention refers also to the alloy obtained through that process, as well as to the object/manufactured article covered with the alloy obtained through that process.

主权项

1. A process for electrolytically depositing a layer of a substantially tin- and ruthenium-based alloy on a cathode soaked into an aqueous electrolytic bath containing at least effective amounts of tin, ruthenium, conductor salts, complex-forming salts, alkali metal hydroxides, comprising:
providing, in said aqueous electrolytic bath; tin in an amount comprised between 1 and 100 g/L, pro liter of electrolytic bath; ruthenium in an amount comprised between 0.030 and 10 g/L, pro liter of electrolytic bath; one or more conductor salts in an amount comprised between 5 and 100 g/L, pro liter of electrolytic bath; complex forming salts in an amount comprised between 10 and 100 g/L, pro liter of electrolytic bath; and alkali metal hydroxides in an amount comprised between 0.2 and 10 g/L, pro liter of electrolytic bath; wherein, in said electrolytic bath, cyanides and toxic and allergenic metals or metalloids, Be, Ni, Cd, As, Tl are absent.