| 摘要 |
A permanently solderable palladium-nickel electroplated coating on an electrically conductive substrate said coating comprising: a first alloy layer of 46 to 82 atomic percent palladium and 18 to 54 atomic percent nickel adhered to the substrate and a second continuous layer covering said first layer of 96 to 100 atomic percent metallic palladium and 0-4 atomic percent nickel, the second layer having a thickness up to 2 nm. - (18pp) EPAB- EP-146152 B A permanently solderable palladium-nickel electroplated coating on an electrically conductive substrate said coating comprising: a first alloy layer of 46 to 82 atomic percent palladium and 18 to 54 atomic percent nickel adhered to the substrate and a second continuous layer covering said first layer of 96 to 100 atomic percent metallic palladium and 0-4 atomic percent nickel, the second layer having a thickness up to 2 nm. USAB- US4463060 A A permanently solderable article comprises an electrically conductive substrate, esp. a contact on which are electroplated (a) a first alloy layer of 46-82 wt.% Pd and 18-54 wt.% Ni and (b) a second continuous layer, covering the first layer, of 96-100 wt.% Pd and 0-4 wt.% Ni, this layer being up to 20 Angstroms thick. - The article is produced by electroplating the substrate at 35-55 deg. C, pH 7.5-9 and current density 5-25 A/sq. dm using a bath consisting of (1) palladium (II) ammine chloride, (2) nickel ammine sulphate or nickel chloride, (3) sodium vinyl or allyl sulphonate or quaternised pyridine as brightener, and (4) ammonium sulphate or chloride, with vigorous agitation, and then immersing in sulphuric or hydrochloric acid to remove Ni from the surface. |
