A process has been developed for the production of adherent nickel deposits of good quality on steel without the uSe of an electric current. The deposition of nickel is brought about by chemical reduction of a nickel salt with hypophosphites in a hot ammoniacal solution. The reaction is catalytic and, under the prescribed conditions of concentration and pH, no reduction occurs in the solution unless certain metals, such as steel or nickel, are introduced into the bath. The reduction then occurs only at the surface ot the immersed metal with the production of a coating of nickel of 96 to 97 percent purity.
A process has been develop ed for dep ositing n ickel a n d co balt fr om hot solut ions o f hypophosphite wi th out t h e use o f curren t . T he r edu ction of metal occurs only on cer tain ca talyt ic m etal s urfaces. By sp ecific pretreatm ents, t he a dhesion of t he dep osits can be im p roved a nd b y other p retr eatments, t he reduction can be indu ced o n noncatal ytic surfaces. The r ed uctio n can be i nhi bited co mpletel y by the presence of cer tain ions in t he plati ng solu tio n or by th e ca talytic metal surface becomin g in active. TIle possible mecha ni s m of the react ion and t he facto rs affecting t he rate of deposi t ion a rc discu ssed . T he deposit p rodu ced by t his proces are sound , hard , a nd of good quali ty .
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