![]() 7075 describes the grade and T6 describes the generic heat treatment process used on the metal.ħ000 series alloys have zinc as the primary alloying element together with magnesium. The vast majority of carabiners used in recreational climbing are made from 7000 series aluminum alloys with aluminum alloy 7075-T6 being the most widely used. These properties can be further modified both by the addition of extra alloying elements and processing treatments that occur during the production of the finished alloy product. ![]() These main alloying elements impart specific properties to the alloy. The families differentiate themselves from each other by their principal alloying elements: There are currently 8 families of aluminum alloys and each family group is identifiable by the first number of its name. They are often asked for the reasons why this corrosio n occurs.Īluminum alloys are widely used in the manufacture of climbing products because these alloys can offer a high strength-to-weight ratio combined with good ductility and toughness. Almost invariably these carabiners have been to Thailand (although DMM have seen similar corrosion from carabiners used in Hawaii). Each year DMM receive back a few carabiners where the surface of the carabiner has corroded and e xfoliated.
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