A kind of nickel-tungsten-phosphorus alloy plated on the surface of beryllium copper and its preparation method

Abstract

The invention discloses a preparation method of a nickel-tungsten-phosphorous alloy plated on the surface of beryllium copper. The preparation method comprises the following steps of oil removal, acidpickling for bright dipping, polishing, membrane removal, activation, PH value adjusting, plating tank electroplating, dehydration for discolor prevention and drying which are executed in sequence. The water washing step is executed after each step except the steps of PH value adjusting and drying. According to the beryllium copper plated with the nickel-tungsten-phosphorous alloy obtained aftera series of technological treatment, the film layer of the nickel-tungsten-phosphorous alloy is 15-25 micrometers, the hardness can reach 1000 HV or above, and the melting point can reach 1300 DEG C or above. When the beryllium copper is applied to preparing a track conductive device, when an elastic copper sheet and a positive pole copper plate make contact and are powered on, the copper sheet can be bounced off even if high temperature is produced, a short circuit is avoided, and safety operation of a streetcar is guaranteed.

Description

technical field [0001] The invention relates to the technical field of beryllium copper surface treatment, in particular to a nickel-tungsten-phosphorus alloy plated on the surface of beryllium copper and a preparation method thereof. Background technique [0002] Zhuhai Tram Line 1 project adopts imported foreign technology, and its power supply adopts braidless ground power supply technology. In this power supply technology, beryllium copper track conductive devices will be used. Rainy, high temperature and humid climate will directly affect the quality of power supply. This kind of external harsh environment affects and accelerates the surface oxidation and conductivity stability of the beryllium copper track conductive device. In particular, the elastic copper sheet and the positive copper plate in the track conductive device will generate an arc and then generate high temperature and sparks when they are in contact with electricity, while the conventional beryllium copp...

AI Technical Summary

Problems solved by technology

[0002] Zhuhai Tram Line 1 project adopts imported foreign technology, and its power supply adopts braidless ground power supply technology. In this power supply technology, beryllium copper track conductive devices will be used. Rainy, high temperature and humid climate will directly affect the quality of power supply. This kind of external harsh environment affects and accelerates the surface oxidation and conductivity stability of the beryllium copper of the track conductive device

In particular, the elastic copper sheet and the positive copper plate in the track conductive device will generate an arc and then generate high temperature and sparks when they are in contact with electricity, while the conventional beryllium copper has a low melting point and poor hardness, most of which have a melting point of 870-900 ° C and a hardness of 200 -250HV, which causes beryllium copper to melt easily at high temperature, and cannot bounce off normally after contact, which will lead to short circuit of the line and burn out the module, causing the tram to stop running

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