阅读说明：本技术 一种高温合金镀锌前预镀镍处理工艺 (Pre-nickel plating treatment process before high-temperature alloy galvanization ) 是由 张颖 王辉 张佳仪 郭春光 王春华 于 2021-10-20 设计创作，主要内容包括：本发明属于金属表面处理技术领域,具体涉及一种高温合金镀锌前预镀镍处理工艺。本发明的技术方案如下：一种高温合金镀锌前预镀镍处理工艺,预镀镍的溶液成份包括：硫酸镍(NiSO-(4)·7H-(2)O)260～320g/L和盐酸[HCl(ρ＝1.19)]180～220g/L；预镀镍工艺条件为：阳极材料：NY1、NY2,温度15-25℃,时间3～5min,电流密度5～10A/dm～(2)。本发明能够提高锌层的结合力,能够解决锌层起泡、起皮、脱落、镀层不连续等质量问题。(The invention belongs to the technical field of metal surface treatment, and particularly relates to a nickel preplating treatment process before high-temperature alloy galvanization. The technical scheme of the invention is as follows: a pre-nickel plating treatment process before high-temperature alloy zinc plating, wherein the solution components of the pre-nickel plating comprise: nickel sulfate (NiSO) 4 ·7H 2 O)260 to 320g/L and hydrochloric acid [ HCl (rho ═ 1.19)]180-220 g/L; the process conditions of the nickel preplating are as follows: anode material: NY1 and NY2 at 15-25 deg.C for 3-5 min, and at a current density of 5-10A/dm 2 . The invention can improve the binding force of the zinc layer and solve the quality problems of foaming, peeling, falling off, discontinuous plating layer and the like of the zinc layer.)

1. A pre-nickel plating treatment process before high-temperature alloy zinc plating is characterized in that the solution components of the pre-nickel plating comprise: nickel sulfate (NiSO)₄·7H₂O)260 to 320g/L and hydrochloric acid [ HCl (rho ═ 1.19)]180-220 g/L; the process conditions of the nickel preplating are as follows: anode material: NY1 and NY2 at 15-25 deg.C for 3-5 min, and at a current density of 5-10A/dm²。

Technical Field

The invention belongs to the technical field of metal surface treatment, and particularly relates to a nickel preplating treatment process before high-temperature alloy galvanization.

Background

In the production of protecting metal surfaces, electrogalvanizing is a relatively common steel material protecting technology. For a steel substrate, a zinc coating belongs to an anode coating and is mainly used for preventing corrosion of steel, so that the zinc coating is widely applied to the field of aviation. However, direct galvanization of superalloy components has resulted in blistering, flaking, and discontinuous coatings.

Disclosure of Invention

The invention provides a pre-nickel plating treatment process before high-temperature alloy galvanization, which can improve the binding force of a zinc layer and solve the quality problems of bubbling, peeling, falling, discontinuous plating and the like of the zinc layer.

The technical scheme of the invention is as follows: a pre-nickel plating treatment process before high-temperature alloy zinc plating, wherein the solution components of the pre-nickel plating comprise: nickel sulfate (NiSO)₄·7H₂O)260 to 320g/L and hydrochloric acid [ HCl (rho ═ 1.19)]180-220 g/L; the process conditions of the nickel preplating are as follows: anode material: NY1 and NY2 at 15-25 deg.C for 3-5 min, and at a current density of 5-10A/dm²。

The invention has the beneficial effects that: the invention adopts the high-temperature alloy part which is galvanized after the nickel is plated in advance, solves the problems of zinc layer quality such as bubbling, peeling, falling, discontinuous coating and the like of the zinc layer, has the zinc layer quality obviously superior to that of the part without pretreatment, improves the zinc layer quality of the part, and ensures the safety and reliability of the engine.

Detailed Description

The experimental material used GH 4169. The process flow comprises the following steps: electrolytic degreasing → hot water washing → cold water washing → weak corrosion → cold water washing → preplating nickel → cold water washing → galvanizing → cold water washing → passivation → cold water washing → blow-drying → inspection.

Example 1

Nickel sulfate (NiSO)₄·7H₂O)260g/L

Hydrochloric acid [ HCl (ρ ═ 1.19) ]180g/L

Anode material: NY1, NY2

Temperature: 15 deg.C

Time: 3min

Current density: 5A/dm²

After the nickel preplating treatment is adopted, the obtained zinc coating is complete and delicate, the quality problems of the zinc coating, such as foaming, peeling, falling, discontinuous coating and the like, are avoided, and the zinc coating has good binding force and corrosion resistance.

Example 2

Nickel sulfate (NiSO)₄·7H₂O)320g/L

Hydrochloric acid [ HCl (ρ ═ 1.19) ]220g/L

Anode material: NY1, NY2

Temperature: 25 deg.C

Time: 5min

Current density: 10A/dm²

After the nickel preplating treatment is adopted, the obtained zinc coating is complete and delicate, the quality problems of the zinc coating, such as foaming, peeling, falling, discontinuous coating and the like, are avoided, and the zinc coating has good binding force and corrosion resistance.

Example 3

Nickel sulfate (NiSO)₄·7H₂O)280g/L

Hydrochloric acid [ HCl (ρ ═ 1.19) ]230g/L

Anode material: NY1, NY2

Temperature: 20 deg.C

Time: 4min

Current density: 8A/dm²

After the nickel preplating treatment is adopted, the obtained zinc coating is complete and delicate, the quality problems of the zinc coating, such as foaming, peeling, falling, discontinuous coating and the like, are avoided, and the zinc coating has good binding force and corrosion resistance.