Abstract: Surface oxides, such as copper, zinc and aluminum oxides, are effectively removed from copper-base alloys by a process comprising:(a) contacting the alloy surface with an aqueous solution containing potassium ions, e.g. a solution prepared by dissolving potassium hydroxide in water; and(b) subsequently contacting the alloy surface with an aqueous solution comprising an acid, a peroxide, and a metal oxide, e.g. a solution of sulfuric acid, hydrogen peroxide and molybdic acid, the solution having:(i) an acid equivalent of a sulfuric acid solution of about 4 to 30 percent by volume;(ii) a peroxide concentration of about 1 to 30 percent by volume; and(iii) a metal oxide concentration of about 0.1 to 5 percent by volume.

Abstract: A method for preparing synthetic oils characterized by a high viscosity index and prepared from 1-olefin is described. The method comprises polymerizing a 1-olefin or a mixture of 1-olefins in the presence of(a) at least one transition metal halide catalyst,(b) at least one alkyl aluminum compound containing up to about 15 carbon atoms in each alkyl group and up to about 40 carbon atoms per molecule as a co-catalyst, and(c) a saturated alkyl fluoride.The homopolymers and copolymers prepared in accordance with the method of the invention generally are characterized by a high viscosity index such as between about 100 to 300. The homopolymers and copolymers are useful as synthetic lubricants and as additives to synthetic or mineral oil lubricants for modifying the viscosity index characteristics of the lubricants.