铝合金在铸造过程中最易产生疏松、气孔及氧化夹渣等缺陷。这些缺陷对合金的机械性能影响很大。例如具有同一显微组织的合金,其强度即随疏松程度的增加而显著减小。故要正确反映合金的质量,必须在显微鉴定的同时再作宏观检查,以鉴定合金的疏松度等。铝合金常用的宏观浸蚀剂常用的宏观检查浸蚀剂有下列三种: Aluminum alloy casting process in the most prone to loose porosity and oxidation slag defects. These defects have a great impact on the mechanical properties of the alloy. For example, the same microstructure of the alloy, the strength that is with the porosity increased significantly reduced. Therefore, we must correctly reflect the quality of the alloy, microscopic identification must be made at the same time macro-examination to identify the porosity of the alloy. Common macroscopic aluminum etching agents commonly used macro-inspection etchants have the following three: