Corrosion protection of mild steel surfaces

Indian researchers have reported the superior corrosion-resistant properties of conducting polyurethane networks of polyaniline (PANI), poly-m-aminophenol (PmAP), and poly-o-anisidine (PoA) coated on mild steel panels.

Corrosion protection of mild steel surfaces. Source: Pixabay -

These networks were prepared by blending conducting polyanilines with isocyanate-containing prepolyurethanes.

PU-PANI shows best protection

Free-standing polyurethane films were obtained after a moisture cure for several days to ensure complete reaction of the excess isocyanate. The films were electrochemically active with conductivity in the range of 10−2 to 10−3 S/cm. The solution blends and formed films were characterised by infrared, ultraviolet, thermogravimetric analysis, and differential scanning calorimetry. Electrochemical corrosion studies showed excellent corrosion protection in the following order: PU-PANI  PU-PmAP  PU-PoA.

The study is published in: Journal of Applied Polymer Science, Volume 135, Issue 6, February 10, 2018.

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