Which material is essential for metal fasteners used with carbon/graphite composite structures?

When considering the appropriate materials for fasteners used with carbon/graphite composite structures, the key factor is the potential for galvanic corrosion and the compatibility of materials. Carbon/graphite composites are electrochemically active and can lead to corrosion issues if incompatible metals are used in conjunction with them.

Titanium and corrosion-resistant steel are both excellent choices in this context. Titanium has a high strength-to-weight ratio and excellent corrosion resistance, which makes it suitable for aerospace applications, particularly when weight and durability are crucial. Corrosion-resistant steel, such as those classified under stainless steel, provides robust mechanical properties along with resistance to corrosion, making it favorable for use in environments where moisture and other corrosive agents may be present.

The combination of titanium or corrosion-resistant steel ensures that the fasteners will perform well without risking galvanic corrosion with the carbon/graphite composite. Therefore, these materials are essential for ensuring longevity and reliability in structural applications involving carbon/graphite composites.