Liquid penetrant inspection methods may be used on which of the following materials?

Liquid penetrant inspection methods are versatile nondestructive testing techniques used to detect surface-breaking defects in various materials. The correct response indicates that both ferrous and nonferrous metals can be effectively evaluated using these methods.

Ferrous metals, which contain iron, can benefit from the liquid penetrant technique because it allows inspectors to identify cracks, inclusions, and other surface imperfections that could compromise the integrity of the material. This is particularly valuable in industries such as automotive and aerospace, where the reliability of metal components is critical.

Nonferrous metals, which do not contain significant amounts of iron (such as aluminum, copper, and titanium), are also suitable for liquid penetrant inspection. The penetrants used in this method can adhere to and seep into the surface-breaking defects of these metals just as efficiently as in ferrous ones. This ability to detect defects across a broad range of metallic materials is a key advantage of the liquid penetrant method.

While some materials, such as porous plastics, may allow the penetrants to seep in, the primary focus of liquid penetrant inspections is on metals. Thus, the choice that includes both ferrous and nonferrous metals reflects the method's wide applicability in real-world inspection scenarios, making it an essential tool for