Method for preparing iron-nickel or iron-nickel-chromium alloy foil and electrolyte used in same

Abstract

The invention discloses a method for preparing an iron-nickel or iron-nickel-chromium alloy foil and an electrolyte used in same. The invention belongs to the field of precise alloy and relates to a method for electrolytically depositing alloy, in particular to a method for preparing iron-nickel and iron-nickel-chromium alloy foils with iron content of not less than 58%, and an electrolyte used in the method. In the method for preparing the alloy foil, DC (Direct Current) deposition is adopted; the electrolyte is sulphate-chloride or sulphate-chloride-trivalent chromium aqueous solution, and synchronously, a brightening agent, a compounding agent and an additive are added; and a titanium roller is used as a cathode and iron, nickel and titanium form a conformal anode. The electrolysis method has the features of short production process, easiness in maintaining solution, easiness in controlling components and thickness of foils, fine crystal, good surface quality, high magnetic performance and low thermal expansion coefficient. The produced foil is applicable to serving as soft magnetic materials in electronic and electric appliance fields and can also serve as elements in precise instruments, optical instruments and electronic devices.

Description

technical field [0001] The technology of the invention relates to a method for electrolytically depositing alloys, especially a method for preparing iron-nickel and iron-nickel-chromium alloy foils with an iron content of not less than 58%, and the used electrolyte. Background technique: [0002] Iron-nickel and iron-nickel-chromium alloys have high magnetic permeability and low coercive force, good protection and decoration, and are good soft magnetic materials and packaging materials. The magnetic properties of alloys are enhanced with the increase of iron content. Substituting iron for expensive nickel to produce high-iron alloys can save costs, especially iron-nickel alloys (Invar alloys) with iron content of 63-64% have extremely low thermal expansion Coefficients are widely used as components of precision instruments, optical instruments and electronic equipment, and are also widely used in aerospace, military weapons, microwave communications, color TV shadow masks an...

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Problems solved by technology

But most of them are about the preparation of alloy foil with 20-50% iron content, the alloy foil has high iron content, high stress, it is difficult to get a complete foil, and it is also difficult to increase the chromium content

U.S. Patent (4231847) adopts high-concentration iron salt and high temperature (255g / LFeSO 4 ·6H 2 O, 90 ℃) to prepare Invar alloy foil, Chinese patent (1793433) adopts low-concentration metal salt, low current density and high pH value conditions to prepare Invar alloy foil, but the above-mentioned method has deficiencies, such as high production cost, electrolyte Poor stability and low oxidation resistance

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