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Plating solution for electrodepositing bright Zn-Fe alloy with low Fe content from sulfate system

A zinc-iron alloy and sulfate technology, which is applied in the field of electrodeposition to prepare protective alloy coatings, can solve the problems of no Zn-Fe alloy process, low current efficiency and deposition speed, poor dispersion ability and deep plating ability, etc. Achieve the effects of easy passivation treatment, improved dispersion ability, and stable plating solution

Inactive Publication Date: 2004-08-18
周益春 +2
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Problems solved by technology

The cyanide-free alkaline system has relatively good dispersing ability and deep plating ability, but the current efficiency and deposition speed are relatively low and the requirements for additive control are relatively strict
The production efficiency of the acidic chloride system is relatively high, the control of the bright additive is relatively simple, and it can withstand a large current density, so the deposition speed is fast, but the dispersion ability and deep plating ability are relatively poor
However, there have been no reports on the electrodeposition of Zn-Fe alloys with low iron content from sulfate systems.

Method used

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Embodiment Construction

[0007] The invention mainly consists of two parts, the synthesis of additives and the preparation of electroplating solution.

[0008] First, synthesize bright additive TF, dissolve 13g benzylidene acetone in 120g polyethylene glycol octylphenyl ether R-C under heating condition 6 h 4 O(C 2 h 4 ) 10 In H, after complete dissolution, add 65g of absolute ethanol and incubate at 30°C for 7 hours to completely dissolve the main brightener in the carrier; then dissolve 11g of sodium benzoate in 100ml of hot water and add 16g of NN-dimethylaniline , so that the two are uniformly dissolved; finally, the above two solutions are mixed, and water is added to 1 liter, which is a brightener with a mass percentage of 21%. One end of the aromatic ring of the main brightener is connected with an aldehyde group and a carbonyl group to increase its hydrophilicity; the main function of the main brightener is to form an adsorption film on the cathode, which increases the metal Ions reduce t...

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Abstract

The preparation method of plating solution for low ion content (less than 1 wt%) bright zinc-iron alloy by utilizing sulfate system is characterized by that the brightening agent of its formula is mainly formed from benzylideneacetone, polyglycol octylphenyl ether, sodium benzoate, NN-dimethyl aniline and anhydrous ethyl alcohol, and the iron content is the deposit is 0.3-0.85 wt%, and can be regulated by means of regulating ratio of Zn(2+) and Fe(2+) in the plating solution. Said preparation method is simple and reasonable, and the pH value of the plating solution using citric acid as buffer agent is stable, it can be used for surface protection and decoration treatment for plates and strips.

Description

technical field [0001] The invention belongs to the technical field of preparing a protective alloy coating by an electrodeposition method. Background technique [0002] Zn-Fe alloy coating is a protective alloy coating with good corrosion resistance, reworkability, weldability, strong paint film adhesion and excellent creep resistance. Therefore, it is widely used in industrial production, especially in countries such as Europe, America and Japan, and is mainly used in industrial fields such as automobiles, aviation and electronics to slow down the corrosion of the surface of metal parts caused by saline-alkali and sandy weather. Generally, according to the level of iron content, it can be divided into high-iron Zn-Fe alloy coating and low-iron Zn-Fe alloy coating; The alloy is easy to passivate, so that the corrosion resistance of the alloy coating can be greatly improved and the decorative performance can also be improved. Zn-Fe alloys with low iron content can be rough...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56
Inventor 周益春杨才千龙志林
Owner 周益春
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