Flowmeter acieral rotating impeller rapid moulding and surface hardening anti-corrosion process

Abstract

The invention provides a flowmeter acieral rotating impeller rapid moulding and surface hardening anti-corrosion process. The anti-corrosion process comprises following steps of employing an acieral rotating impeller which is formed by carrying out composite casting moulding on silica sol; carrying out impeller surface texturing including a surface turn-milling processing step, an ultrasonic cleaning and deoiling step, a micro-etching texturing step, a transition bonding layer generating step and an activating step; and carrying out impeller surface blackening including an ultrasonic cleaning and deoiling step, an etching and bright dipping step, an oxidizing and coloring step and an enclosing step. By combining a silica sol composite casting process technology, an acieral surface texturing technology and a surface blackening process technology, a single or a batch of flowmeter acieral rotating impellers can be produced quickly, the impeller is high in surface hardness and good in wear resistance and corrosion resistance, and the service life of the acieral rotating impeller in the flowmeter can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of manufacturing general machinery and fluid control equipment, in particular to a process for rapid prototyping and surface hardening and corrosion resistance of an aluminum-based alloy rotary impeller for a flow meter. Background technique [0002] Aluminum-based alloys are widely used in various industrial and technical fields due to their soft quality, light weight, easy processing, and low cost. At present, in the flowmeter production industry, a large number of aluminum-based alloys are also used, including flowmeter casings, metering device casings, and some built-in parts, such as turbines or impellers. However, in the process of flowmeter production, the most difficult thing to process is the turbine or impeller, especially the rotary impeller, which is mainly manifested in the following two problems: First, because the rotary impeller is rotatable and processed by aluminum-based die-casting technol...

AI Technical Summary

Problems solved by technology

However, in the process of flowmeter production, the most difficult thing to process is the turbine or impeller, especially the rotary impeller, which is mainly manifested in the following two problems: First, because the rotary impeller is rotatable and processed by aluminum-based die-casting technology, it is not easy to process Easy to demould, difficult to shape

Although the quality of this type of process is stable, it takes a long time to form a single product and wastes a lot of raw materials

According to different sizes, it is generally divided into four steps: sawing, turning out the prototype, turning the head and trimming, and milling the impeller. The longer the processing time is, the more difficult the processing will be. At the same time, the direct turning and milling of the impeller is a great waste of material.

Second, due to the soft material, low density, and insufficient hardness of the aluminum-based alloy, it is easily deformed or damaged under the impact of medium pressure, and the acid, alkali, sulfide and other corrosive substances contained in the medium have a strong impact on the surface of the aluminum-based alloy impeller. Corrosion will occur, which will affect the service life

However, due to the soft material and large expansion coefficient of the aluminum-based alloy, it is easy to generate traces of impurities such as hydrogen, chlorine, and moisture from the aluminum-based alloy during electroplating, electrophoresis, and conductive heating, which can easily cause pinhole pitting in the electroplating layer. , affecting its corrosion resistance

If the electroplating time is prolonged, the pinholes will be covered, and impurities such as gas will easily be covered between the electroplating layer and the substrate to form an impurity interlayer. Such interlayers are generally not easy to find, but during the operation of the machine, when the external force is applied Under the action, it is very easy to cause the electroplating layer to peel off, thereby increasing the corrosion of the aluminum-based alloy substrate, and also has a potential impact on its surface hardness, thus affecting the service life of its products

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