Low-hydrogen embrittlement cyanide-free alkaline galvanizing method for aviation high-strength steel

The low-hydrogen embrittlement cyanide-free alkaline galvanizing method solves the problem of hydrogen embrittlement sensitivity in aviation high-strength steel, obtains a galvanized layer with excellent corrosion resistance and mechanical properties, and ensures the safety and environmental protection of aircraft.

CN120797104APending Publication Date: 2025-10-17SHENYANG AIRCRAFT CORP
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Patent Information

Application Number
CN202511071524.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-01
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

The existing alkaline galvanizing process has the problem of hydrogen embrittlement sensitivity in aviation high-strength steel, which affects the mechanical properties and safety of the material.

Method used

The low hydrogen embrittlement cyanide-free alkaline zinc plating method is adopted, and the plating solution and passivation solution that do not contain toxic substances are used. By controlling the process parameters such as temperature, time and current density, a low hydrogen embrittlement zinc plating layer is formed.

Benefits of technology

A galvanized layer with low hydrogen embrittlement sensitivity is obtained, which improves the corrosion resistance and mechanical properties of the material, ensures the reliability and safety of the aircraft, and the wastewater treatment is simple and meets environmental protection requirements.

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Abstract

The invention belongs to the technical field of metal surface cyanide-free alkaline zinc plating, and relates to a low-hydrogen embrittlement cyanide-free alkaline zinc plating method for aviation high-strength steel. The activated part to be plated is placed in an electroplating bath containing a zinc plating solution, alkaline cyanide-free zinc plating is conducted, passivation is conducted through a passivation solution, and a low-hydrogen-embrittlement cyanide-free alkaline zinc plating part is obtained; the process method is simple, and a uniform and bright zinc coating is obtained on the surface treated by the process. The process method does not contain toxic cyanide and hexavalent chromium in the production and use processes, wastewater treatment is simple, and good operation safety is achieved. A hydrogen brittleness test is carried out according to the standard HB5067.1, and the breaking time is longer than 200 hours. And the zinc coating has better corrosion resistance. A plating layer obtained by matching zinc plating and trivalent chromium passivation post-treatment is subjected to a neutral salt spray test according to the standard ASTM B117-07, and red rust does not appear after 720 hours. The method has a wide application prospect and an extremely high practical value.
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