Some causes of increased corrosion damage of Al-6%Mg alloy sheets and plates

The between the quantitative content of excess phases and the corrosion resistance of the material of hot-rolled sheets and plates made of aluminum-magnesium alloy Al-6%Mg “АМг6” is considered. It has been shown that intermetallic compounds of Mg2Al3 and Mg5Al8 formed from the main components of the alloy have the greatest influence on the corrosion properties of materials. The examples show that considering even high purity aluminum as an anisotropic material distorts the assessment of its corrosion properties, all the more important for industrial alloys. Although scientific approaches have long been developed that take into account the influence of the type of structure and intermetallic compounds on the corrosion characteristics of various materials made of aluminum alloys, various regulatory documents and studies of specialists often do not take into account the data of mutual studies, they are disjointed. In particular, this applies to industry standards “OST 92-1619-87” and “OST 92-1017-79”, which is why materials that have not identified signs of burning can get into production under the guise of high-quality ones. As measures to limit the amount of excess phases formed in the material and the associated possible corrosion damage, an increase in uniformity and a decrease in the temperature of its deformation are proposed.
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