Method of fabricating robust micro-capillary for corrosion testing

A simple and straightforward method is introduced to fabricate micro-capillary tips with diameter around 20 µm that are ideal for corrosion testing of small phases in multiphase alloys. The approach produces robust tips that are not susceptible to fracture, eliminates issues related to silicone skirts, and offers a high yield of fabrication. The functionality of a 20 µm diameter micro-capillary is validated through potentiodynamic polarization experiments on 316L stainless steel, AA6016, β constituent phase (AlxFeySi) in 6xxx aluminum alloys, and the austenite and ferrite phases in 2205 duplex stainless steel. The results exhibit good repeatability and agree with literature data.