KR840001232A - Electroplating method - Google Patents

Abstract

No content

Description

Electroplating method

As this is a public information case, the full text was not included.

Claims (16)

A method of manufacturing a coated metal part by electroplating a nickel-zinc alloy coating on an electrically conductive substrate in a bath containing nickel and zinc ions and removing almost all zinc from the coating, the projection of the nickel anode set. The nickel and zinc ions were supplied to the bath from the nickel anode set and the zinc anode set having a ratio of the total surface area projected toward the substrate of the zinc anode set to the substrate on the basis of the set of targets. By operating the individual anodes, the bath is maintained at a concentration of 0.75 to 1.25 moles of nickel and 0.75 to 1.25 moles of zinc, and a coating of 60 to 70% by weight zinc and 30 to 40% by weight of nickel is coated in a range of 5 to 100 microns. A method of manufacturing a coated metal part, comprising electroplating the substrate for several hours at a sufficient current density that can be coated to a thickness of. The method according to claim 1, wherein the ratio of zinc ion concentration to nickel ion concentration in the bath is from 2: 1 to 1: 2. The method of claim 2 wherein the ratio of nickel ion concentration to zinc ion concentration in the bath is about 1: 1. Claim 1 wherein, in the 2 or 3 wherein the current density of each of the positive electrode from 0.1 to ² amp/cm 2 (0.0155 to 0.31cmamp / cm ²⁾ methods. The method of claim 4, wherein the current density is about 0.5 amp / in ² (0.0775 amp / cm ² ). The method according to any one of claims 1 to 5, wherein the nickel-zinc alloy coating has a thickness of 5 to 100 microns. The method of claim 6, wherein the nickel-zinc coating has a thickness of 30 to 50 microns. 8. The method of any one of claims 1 to 7, wherein the coating contains about 66% zinc and about 34% nickel. The process according to any one of claims 1 to 8, wherein the bath temperature is 10 to 60 ° C and dH is 2 to 5. The method of claim 1, 2 or 3, wherein the nickel and zinc concentrations in the bath are maintained at about 1 molar concentration. The method according to claim 1, wherein the zinc is removed by treating the substrate coated with an alkaline solution. The method according to any one of claims 1 to 11, wherein the number of nickel anodes in the nickel anode set is 1/2 of the number of zinc anodes in the zinc anode set. An article made by the method of claim 1. Two anode sets consisting of a cathode, essentially a first set of nickel, and a second set of anodes essentially of zinc with a surface area that is approximately two times larger than the surface of the first set of anodes. A device for supplying current to each anode in each set of anodes at a level such that the current density is approximately equal to that of the other anodes, a device for maintaining the bath at a temperature of 10 to 60 ° C, and a tank at a pH of 2 to 5 Electroplating apparatus for manufacturing coated metal parts consisting of adjusting devices. An electrolytic cell for producing chlorine and caustic, comprising an anode, a cathode and a separator element positioned between the anode and the cathode, characterized by using the article of claim 13 as a cathode. An electrolytic cell for electrolysis of water, comprising an anode, a cathode, and a separator element located between the anode and the cathode, characterized by using the article of claim 13 as a cathode. ※ Note: The disclosure is based on the initial application.