Additive for electro-deposited bright ferro-nickel alloy

Abstract

The invention relates to an additive for an electro-deposited bright ferro-nickel alloy. The additive comprises a brightener and a complexing agent. The brightener comprises the following components: N-propargyl cyanamide, n-propargyl cyanamide salt, N-propargyl dicyandiamide, N-propargyl dicyandiamide salt, bis-N-propargyl dicyandiamide and bis-N-propargyl dicyandiamide salt; the complexing agent comprises the following components: amino acetic acid, amino acetate, aminopropionic acid, aminopropionate, diphosphonic acid and diphosphonate. By means of a synergistic effect of alkynyl and nitrile functional groups, the propargyl-containing cyanamide compound has very good brightening and leveling effects if being used in a ferronickel plating solution; the ferronickel plating coating can be prevented from flooding and fogging effectively by means of double complexing action of amino acids such as amino acetic acid and aminopropionic acid and diphosphonic acid and salt compositions thereof.

Description

technical field [0001] The invention relates to an additive, in particular to an additive for electrodepositing bright nickel-iron alloy. Background technique [0002] Nickel-iron alloy is magnetic and can be used as a magnetic material. At the same time, the electrodeposited nickel-iron alloy coating has a nano-crystalline structure, which has good hardness and wear resistance, and is used on the surface of the crystal. The nickel-iron alloy solution with certain additives can electrodeposit an electrodeposited alloy layer whose brightness and leveling property are no less than that of the nickel plating solution, and is widely used to replace the nickel plating process. Since the deposited layer that can be deposited from the nickel-iron alloy solution contains 1-60% iron, the material consumption cost can be greatly reduced by replacing the nickel plating. [0003] Electrodeposition of nickel-iron solution and technology has been relatively mature since the 1970s. Howev...

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Problems solved by technology

However, there are still many problems in the actual use and application of electrodeposited bright nickel-iron alloy: (1) the nickel-iron alloy solution contains iron ions, and the pH value is 3.0 to 3.5 at the same time. The composition and process conditions are different from nickel plating, but the existing Additives simply use bright nickel plating intermediates such as alkynes or alkenes or pyridine derivatives as brighteners; in order to achieve good brightness and leveling performance, the use of current brighteners requires a high concentration of intermediates and a large amount ;A large number of brighteners lead to problems such as easy burning of large areas of the coating, easy leakage of plating in small areas, excessive inclusion of organic matter in the deposition layer, high brittleness, and difficulty in collecting chromium; at the same time, the use of traditional additives has a narrow bright range

(2) In order to avoid burrs and pinholes in the coating, various organic acids and salts such as citric acid and sodium citrate, sodium gluconate, succinic acid, etc. are used to complex ferric iron. , Under the condition of low pH value, the complexation strength of organic acid to ferrous iron is not enough. In actual use, due to the excess of organic impurities or brighteners and the action of free ferrous iron, the coating often appears blooming phenomenon

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