What type of solvents should be avoided in the penetrant system when testing titanium alloys?

Halogenated solvents should be avoided in the penetrant system when testing titanium alloys primarily because they can lead to corrosion of the titanium surface. Titanium is highly reactive with halogens, and the presence of halogenated solvents can cause degradation, which can compromise the integrity of the titanium components being tested. Additionally, halogenated solvents can retain residues that may also negatively affect the surface condition and the effectiveness of the penetrant inspection process.

In contrast, alcohol-based solvents, aqueous-based solvents, and petroleum-based solvents do not exhibit the same level of reactivity with titanium and are generally safer choices for cleaning and preparing titanium alloys for penetrant testing. This ensures accurate detection of any surface flaws without compromising the material properties of the titanium.