  Unencapsulated aluminum wedge wire bonds are common in particle physics pixel
and strip detectors. Industry-favored bulk encapsulation is eschewed due to the
range of operating temperatures and radiation. Wire bond failures are a
persistent source of tracking-detector failure. Unencapsulated bonds are
vulnerable to condensation-induced corrosion, particularly when halides are
present. Oscillations from periodic Lorentz forces are documented as another
source of wire bond failure. Spray application of polyurethane coatings,
performance of polyurethane-coated wire bonds after climate chamber exposure,
and resonant properties of polyurethane-coated wire bonds and their resistance
to periodic Lorentz forces are under study for use in a future High Luminosity
Large Hadron Collider detector such as the ATLAS Inner Tracker upgrade.
