[ALUMINIUM NETWORK] Because aluminum alloys have severe oxidation and inhalation tendencies, they are in direct contact with the furnace gas or the external atmosphere during the smelting process. Therefore, if the control during the smelting process is slightly inappropriate, the aluminum alloy can easily absorb the gas. The formation of pores, the more common is the pinhole. Pinholes usually refer to precipitating pores less than 1 mm in the castings, which are mostly round and unevenly distributed over the entire section of the casting, especially in the thick section of the casting and where the cooling rate is small. According to the distribution and shape characteristics of the precipitated pores of aluminum alloys, pinholes can be divided into three categories.
1. Mesh pinholes: Pinholes are densely meshed in low-intensity tissues, and there are a few large holes. It is inconvenient to check the number of pinholes per unit area, and it is difficult to measure the diameter of pinholes.
2. Dot-shaped pinholes: In the low-power tissue, the pinholes are in the shape of circles, the pinholes are clearly outlined and discontinuous, and the number of pinholes per square centimeter can be counted, and the diameter can be measured. Such pinholes are easily distinguished from shrinkage holes, shrinkage, and the like.
3. Synthetic pores: It is an intermediate type of point-shaped pinholes and mesh pinholes. From the perspective of low-power tissue, there are many large pinholes, but they are not round-shaped but polygonal.
The production practice of aluminum alloys confirms that the main gas component of the aluminum alloy due to inhalation is hydrogen gas, and there is no certain rule for it to follow. Usually, all or most of the castings have a pinhole phenomenon; It is no exception that aluminum alloys of various compositions easily produce pinholes.
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