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Contact: Mr. Zhao  

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Method for removing hydrogen after electroplating

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Method for removing hydrogen after electroplating

作者: 烟台运通电镀有限公司点击: Release Date: 2019-02-28 Author: Plating Co., Ltd. Yantai Express Views:

Hydrogen embrittlement is a delayed fracture that occurs due to the infiltration of hydrogen into the interior of a metal, causing the metal material to undergo a static stress below the material's yield strength.

Hydrogen embrittlement is a relatively common phenomenon in engineering. Especially in the production process of electroplating, it is easy to cause hydrogen embrittlement in metal materials. Hydrogen embrittlement in the electroplating process mainly occurs in pickling, electroplating and other processes.

Therefore, many parts will be dehydrogenated after electroplating to avoid the harm caused by hydrogen embrittlement. The following editor introduces the method of removing hydrogen after electroplating.

1.General hydrogen removal method

(1) Put the plated parts to be dehydrogenated in an oven (as far as possible in a vacuum furnace), or in hot oil (suitable for hard chrome plated parts), and treat them at 200 ~ 250 ℃ for more than 3H.

(2) Dehydrogenation in hot oil can have the same effect as dehydrogenation in an oven. Because it is uniformly heated, it also has a role of filling pores in the coating, which is conducive to improving the protective function of the coating and has simple requirements for equipment.

2.Propose hydrogen removal method after electroplating according to the requirements of the workpiece

For example, hard chromium plating, because the current efficiency is too low when plating hard chromium, only 13% to 18%, most of the current is consumed by the precipitation of hydrogen, hydrogen easily diffuses into the plating and the matrix of the base metal, and the hydrogen permeation is more serious As a result, the fatigue strength is reduced, which affects the dynamic and static load strength. Therefore, the design should be requested to remove hydrogen after chromium plating. After the hydrogen removal treatment, 60% to 70% of the hydrogen that has penetrated into the coating and the substrate can be removed, thereby greatly reducing the brittleness without reducing its hardness.

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3.Hot oil instead of hydrogen in the oven

The current efficiency of chrome plating is very low, so the porosity of the coating is high, and the coating is easy to passivate. At the same time, the chromium coating on the surface of steel parts has the advantage of cathodic coating. When the thickness of the coating is thin, it is easy to cause rust. To improve this defect, hot oil dehydrogenation can be used instead of the dehydrogenation process in the oven under the same process conditions. Practice has proved that this process can not only keep the temperature of each part of the workpiece uniform, achieve a complete hydrogen removal effect, but also effectively fill the pores and cracks of the chromium layer with grease, thereby improving the protection ability of the chromium layer.

4.The temperature of hydrogen removal should not be too high

For example, after galvanizing, hydrogen is removed by heating to remove hydrogen from the metal. The effectiveness of hydrogen removal is related to the temperature of the hydrogen removal and the length of the holding time. The higher the temperature and the longer the time for hydrogen removal, the more complete the hydrogen removal. But it cannot exceed 250 degrees Celsius. Because at this temperature, the crystal structure of the galvanized layer will be deformed, brittle, and the corrosion resistance will be reduced.

The following points should be noted when removing hydrogen after electroplating:

(1) Safety factor of use of parts. For parts with high safety importance, the hydrogen removal time should be appropriately extended.

(2) The geometry and cross-sectional area of the part. Small and thin parts with notches and small angles that are prone to stress concentration should be strengthened to remove hydrogen.

(3) The degree of hydrogen permeation of parts. Parts that generate more hydrogen and have a longer processing time in the surface treatment should be strengthened in removing hydrogen.

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(4) The nature of the force in use of the part. When the part is subjected to high tensile stress, hydrogen removal should be strengthened, and hydrogen embrittlement will not occur when only the compressive stress is applied.

(5) The surface of the coating needs to be kept clean before removing hydrogen, and the removal of hydrogen should be processed before passivation to ensure the effect of hydrogen removal and the quality of the passivation layer.

(6) After the plating process, the hydrogen should be removed in a continuous time, and should not be stopped in the middle. When possible, wait for the oven to cool to room temperature before opening the oven to remove the parts.

(7) Try not to rework parts after plating. If electroplating is unavoidable, the plating layer can be removed with an alkaline solution and the hydrogen removal time can be extended after electroplating.

(8) Dehydrogenation treatment should be performed within 3 hours after plating.


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Keywords: electroplating , Yantai electroplating , electroplating manufacturers

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    Yantai Yuntong Electroplating Co., Ltd.

    Contact: Mr. Zhao

    Mobile: 183-5353-0888 / 183-6380-6777

    Phone: 0535-4212727 4268278

    Fax: 0535-4216068

    Website: acwlkj.cn

    Address: No. 812, Government Street, Muping District, Yantai

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