High-strength steel low-hydrogen-embrittlement alkaline zinc-nickel alloy electroplating method

Abstract

The invention provides a high-strength steel low-hydrogen-embrittlement alkaline zinc-nickel alloy electroplating method. The high-strength steel low-hydrogen-embrittlement alkaline zinc-nickel alloyelectroplating method comprises the steps of a high-strength steel surface activation process, a plating solution preparation process, a zinc-nickel alloy electroplating process, a cleaning and dehydrogenation process, a passivation process and the like. According to the high-strength steel low-hydrogen-embrittlement alkaline zinc-nickel alloy electroplating method, a high-strength steel surface low-hydrogen-embrittlement alkaline zinc-nickel alloy electroplating solution plating layer adopting the formula is good in dispersity, the allowable temperature range in the electroplating process isexpanded, the allowable temperature width of electroplating exceeds 20 DEG C, the manufacturability of electroplating operation is improved, plating layer inclusions are reduced, a coating complexingagent of the plating layer is stable, and the corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of zinc-nickel alloy electroplating surface treatment, and in particular relates to an electroplating method for high-strength steel and low-hydrogen embrittlement alkaline zinc-nickel alloy. Background technique [0002] Zinc-nickel alloy coating not only has excellent corrosion resistance, but also has good cost performance. Since the electroplating zinc-nickel alloy process was proposed and studied in the early 20th century, after decades of development, various acidic and alkaline electroplating systems have appeared, and the coating performance has also been greatly improved. Zinc-nickel alloys have been studied and applied in many fields. However, the application of most zinc-nickel alloys is concentrated on ordinary low-carbon steel and structural steel, and there are very few applications on high-strength steel, and the acidic system is prone to strong hydrogen embrittlement sensitivity to high-stre...

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Problems solved by technology

However, the application of most zinc-nickel alloys is concentrated on ordinary low-carbon steel and structural steel, and there are very few applications on high-strength steel, and the acidic system is prone to strong hydrogen embrittlement sensitivity to high-strength steel substrates, which is likely to cause hydrogen Brittle fracture, so the selection of alkaline system can reduce the susceptibility to hydrogen embrittlement. At the same time, the addition of different complexing agents and brighteners has different effects on the dispersion of the coating and the plating conditions of the coating. The commonly used electroplating zinc-nickel alloy electroplating solution electroplating The temperature range of electroplating in the parameters is small, there are inclusions in the coating, and some plating solutions are not stable enough