Potassium chloride zinc-iron alloy plating solution and electroplating process

By using sodium glucose heptanoate and sodium sulfosalicylate as coordination agents in the acid zinc-iron alloy plating solution and combining formic acid as brightener, the problem of poor stability of the acid zinc-iron alloy plating solution is solved, and the salt spray resistance of the plating layer is significantly improved.

CN119685891AActive Publication Date: 2025-03-25GUANGZHOU ULTRA UNION CHEM LTD
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Patent Information

Application Number
CN202411964288.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-25
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

The acidic zinc-iron alloy plating solution has poor stability, resulting in poor plating performance and iron hydroxide precipitation problems, which limits its application.

Method used

Potassium chloride zinc-iron alloy plating solution is used to inhibit the oxidation of ferrous ions by using sodium glucose heptanoate and sodium sulfosalicylate as coordination agents, and combined with formic acid as a reducing agent for brightening agents, the stability of the plating solution and salt spray resistance of the plating layer are improved.

Benefits of technology

It significantly improves the salt spray resistance of zinc-iron alloy plating, overcomes the stability problems of traditional acid zinc-iron alloy plating solution, and ensures the long-term stability and performance requirements of the plating.

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Abstract

The plating solution comprises the following components and process parameters: 50-70 g / L of zinc chloride, 2-12 g / L of ferrous chloride tetrahydrate, 180-220 g / L of potassium chloride, 25-35 g / L of boric acid, 8-40 g / L of a coordination agent, 0.1-0.2 mL / L of a brightening agent and 20-30 mL / L of an auxiliary agent, the pH value of the plating solution is 4.5-5.6, the temperature of a plating tank is 15-30 DEG C, the cathode current density is 1-3 A / dm < 2 >, and the cathode movement is 3-5 m / min. According to a neutral salt spray test for 480h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, a galvanized iron alloy sample piece passivated by trivalent chromium blue and white and sealed by the graphene modified sealing agent has no white rust on the surface, and a coating has excellent corrosion resistance.
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