ã€China Aluminum Industry Network】 Aluminium dipping is performed by immersing the pre-treated workpieces in a molten aluminum bath for a certain period of time to remove them and infiltrating a layer of aluminum. Pressure sensor usually consists of a pressure sensor and a signal processing unit for measuring the pressure of liquids and gases. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. According to the working principle, it can be divided into Ceramic Pressure Sensor, diffusion silicon pressure sensor, piezoresistive pressure sensor, sapphire pressure sensor and so on. Pressure Sensor,Miniature Pressure Transducer,Pressure Transducer,Hydraulic Pressure Transducer,pressure transmitter Xi'an Gavin Electronic Technology Co., Ltd , https://www.cngamicos.com
(1) Mechanism of hot dipping aluminum The mechanism of hot dipping aluminum is similar to that of hot dipping. When the liquid aluminum is in contact with iron, the FeAl3 compound is first formed due to the phase interface reaction; after that, the diffusion of the FeAl3 layer is continued, and due to the concentration fluctuation, the Fe2Al5 micro region appears on the surface of the FeAl3: as the AL further diffuses, the Fe2Al5 phase continuously expands into Columnar crystal, FeAl3 phase gradually decreased.
(2) The structural characteristics of the immersed aluminum layer The resulting permeable layer can be basically divided into two layers: the outer layer is an Al-rich layer, and the composition is basically an aluminum liquid: the sublayer is AL, the Fe alloy layer, mainly the metal compound Fe2Al5 phase, A small amount of FeAl3 is present, and the Fe2Al5 phase extends tongue-like into the steel. The Fe2Al5 phase is hard and brittle, and it should be controlled as much as possible within 1/10 of the penetration layer. Controlling the immersion temperature (700-730°C) and adding 2%-6% Be are all beneficial to reduce the thickness of Fe2Al5.